WO2016060415A1

WO2016060415A1 - Method and device for transmitting and receiving broadcasting signal for trick play of xml subtitle

Info

Publication number: WO2016060415A1
Application number: PCT/KR2015/010708
Authority: WO
Inventors: 황수진; 서종열; 오현묵
Original assignee: 엘지전자 주식회사
Priority date: 2014-10-12
Filing date: 2015-10-12
Publication date: 2016-04-21

Abstract

The present invention provides a method and device for transmitting and receiving a broadcasting signal. A method for transmitting a broadcasting signal according to an embodiment of the present invention comprises the steps of: encoding signaling information including video data, subtitle data, and metadata with respect to the subtitle data; generating a broadcasting signal including the encoded video data, the subtitle data, and the signaling information; and transmitting the generated broadcasting signal.

Description

Method and apparatus for transmitting / receiving broadcast signal for trick play of XML subtitle

The present invention relates to a method and apparatus for transmitting and receiving broadcast signals.

Trick play refers to a service that provides random access and double speed functions such as 2x and 4x speeds, which are capable of playing an image at any time. In order to perform trick play, the existing AVC / H.264-based pictures are divided into pictures using the concept of tier according to dependency between pictures. The receiver decodes and displays only pictures having a specific tier value to provide a trick play service.

Recently, standards for XML-based subtitles, such as TTML and EBU-TT, have been established. Their purpose is to provide subtitle services in media and IP streaming environments, but the demand for using them in broadcast services is emerging from standards organizations such as DVB and ATSC.

Currently, there is a movement to use subtitles in the form of XML for UHD broadcasting service in DVB, and currently, commercial requirements are being enacted. Therefore, when providing a Trick play service, there is a need for a method that can efficiently display XML-based subtitles. .

An object of the present invention is to provide a method for displaying a subtitle when providing a trick play service.

An object of the present invention is to provide a method for displaying a subtitle to be synchronized with a video when providing a trick play service.

An object of the present invention is to provide a method for effectively conveying the meaning indicated by a subtitle when providing a trick play service.

The broadcast signal transmission method according to an embodiment of the present invention includes encoding signaling information including video data, subtitle data and metadata about the subtitle data, the encoded video data, subtitle data and signaling information. The method may include generating a broadcast signal including and transmitting the generated broadcast signal.

Preferably, the subtitle data includes one or more subtitle packets, the subtitle packet includes a sentence subtitle, and the subtitle packet indicates an importance of the subtitle packet for a trick play service. It may include at least one of a tier number and a maximum tier number indicating a tier number of the subtitle packet having the least importance among the one or more subtitle packets.

Advantageously, said subtitle data includes one or more subtitle packets, said subtitle packet includes one or more subtitle sections, said subtitle section includes one sentence of a subtitle, and said subtitle packet Is a tier number indicating the importance of the subtitle packet for the trick play service, a maximum tier number indicating the tier number of the least important subtitle packet among the one or more subtitle packets, and the subtitle section of the subtitle section for the trick play service. It may include at least one of priority information indicating a priority and a section number indicating a number of the subtitle section.

Advantageously, said subtitle data includes one or more subtitle packets, said subtitle packet includes one or more subtitle sections, said subtitle section includes one sentence of a subtitle, and said broadcast signal PVR assist subtitle information for performing a trick play of the subtitle data and PVR assist information for performing a trick play of the video data, wherein the PVR assist subtitle information includes the subtitle packet for a trick play service. A tier number indicating an importance level of the subtitle packet, a maximum tier number indicating a tier number of the least important subtitle packet among the one or more subtitle packets, priority information indicating a priority of the subtitle section for a trick play service, and the subtitle title And at least one of a section number indicating a section number, wherein the PVR assist information includes information indicating whether or not information indicating scene transition is included in a video stream portion corresponding to the subtitle packet during a trick play. When playing, the video stream portion corresponding to the subtitle packet may include at least one of information indicating whether information indicating the end of the video stream is included.

Preferably, the PVR assist subtitle information includes at least one of information indicating whether the subtitle packet is displayed for trick play and information indicating a maximum speed of trick play that can be provided through the subtitle section. It may include.

Preferably, the signaling information may include information indicating that the broadcast signal includes at least one of the PVR assist subtitle information and the PVR assist information.

According to another aspect of the present invention, there is provided a method for receiving a broadcast signal, the method comprising receiving a broadcast signal including signaling information including video data, subtitle data, and metadata about the subtitle data, and receiving the broadcast signal from the received broadcast signal. The method may include extracting the video data, subtitle data and signaling information, and decoding the extracted video data, subtitle data and signaling information.

An apparatus for transmitting broadcast signals according to another embodiment of the present invention includes an encoder for encoding signaling information including video data, subtitle data, and metadata regarding the subtitle data, the encoded video data, subtitle data, and signaling. It may include a generator for generating a broadcast signal including information and a transmitter for transmitting the generated broadcast signal.

In accordance with another aspect of the present invention, a broadcast signal receiving apparatus includes: a receiver configured to receive a broadcast signal including signaling information including video data, subtitle data, and metadata regarding the subtitle data, and in the received broadcast signal. It may include an extractor for extracting the video data, subtitle data and signaling information, and a decoder for decoding the extracted video data, subtitle data and signaling information.

According to the present invention, when providing a trick play service, there is an effect that can provide a method for displaying a subtitle.

According to the present invention, there is an effect of providing a method of displaying a subtitle to be synchronized with a video when providing a trick play service.

According to the present invention, when providing a trick play service, there is an effect of providing a method for effectively conveying the meaning indicated by the subtitle.

BRIEF DESCRIPTION OF THE DRAWINGS The accompanying drawings, which are incorporated in and constitute a part of this application for further understanding of the invention, illustrate embodiments of the invention, together with a detailed description that illustrates the principles of the invention.

1 is a view showing a broadcast signal transmission method according to an embodiment of the present invention.

2 is a diagram illustrating a process of playing an XML-based subtitle during trick play according to an embodiment of the present invention (scenario 1).

3 is a diagram illustrating a reproduction process of an XML-based subtitle during trick play according to another embodiment of the present invention (scenario 2).

4 is a diagram illustrating a configuration of an XML-based subtitle packet according to an embodiment of the present invention.

5 is a diagram illustrating a method of playing a subtitle based on XML during trick play according to an embodiment of the present invention.

FIG. 6 is a diagram illustrating a method of signaling a tier number when transmitting an XML-based subtitle without TS muxing according to an embodiment of the present invention (in scenario 1).

FIG. 7 is a diagram illustrating a method of signaling a tier number when transmitting an XML-based subtitle without TS muxing according to another embodiment of the present invention (in scenario 2).

8 is a diagram illustrating a method for signaling a tier number when transmitting and transmitting a subtitle TS based on XML according to an embodiment of the present invention (in case of scenarios 1 and 2).

FIG. 9 is a diagram illustrating a method for signaling priority when transmitting and transmitting an XML-based subtitle by TS muxing according to an embodiment of the present invention (in scenario 2).

FIG. 10 is a diagram illustrating a configuration of a PVR_assist_information_for_subtitle data field and a configuration of a data_field_tag field according to an embodiment of the present invention (scenario 1).

11 is a diagram illustrating the configuration of the PVR_assist_information_for_subtitle data field and the configuration of the data_field_tag field according to another embodiment of the present invention (scenario 2).

12 is a diagram illustrating a configuration of a PVR_assist_information data field according to an embodiment of the present invention.

FIG. 13 is a diagram illustrating a configuration of a program map table (PMT), adapatation_field_data_descriptor, and adaptation_field_data_identifier fields according to an embodiment of the present invention.

14 is a diagram illustrating a configuration of a reception device for a trick play service of an XML subtitle according to an embodiment of the present invention.

15 is a view showing a broadcast signal receiving method according to an embodiment of the present invention.

16 is a diagram illustrating a configuration of a broadcast signal transmission apparatus according to an embodiment of the present invention.

17 is a diagram illustrating a configuration of a broadcast signal receiving apparatus according to an embodiment of the present invention.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings and the contents described in the accompanying drawings, but the present invention is not limited or limited to the embodiments.

The terminology used herein is a general term that is widely used as possible while considering functions in the present invention, but may vary according to the intention or custom of a person skilled in the art or the emergence of a new technology. In addition, in certain cases, there is a term arbitrarily selected by the applicant, and in this case, the meaning will be described in the corresponding description of the invention. Therefore, it is to be understood that the terminology used herein is to be interpreted based on the actual meaning of the term and the contents throughout the specification, rather than simply on the name of the term.

The broadcast signal transmission method according to an embodiment of the present invention encodes signaling information including video data, subtitle data and metadata about the subtitle data (SL1010), the encoded video data and subtitle data. And generating a broadcast signal including signaling information (SL1020) and / or transmitting the generated broadcast signal (SL1030).

According to another embodiment of the present invention, the subtitle data includes one or more subtitle packets, the subtitle packet includes one sentence of a subtitle, and the subtitle packet includes the subtitle for a trick play service. At least one of a tier number indicating an importance of a title packet and a maximum tier number indicating a tier number of a subtitle packet having the least importance among the one or more subtitle packets may be included. Here, the subtitle data may include an XML subtitle. Detailed description thereof will be described later with reference to FIGS. 2, 4, 5, and 6.

According to another embodiment of the present invention, the subtitle data includes one or more subtitle packets, the subtitle packet includes one or more subtitle sections, and the subtitle section includes one sentence of a subtitle. The subtitle packet may include a tier number indicating an importance of the subtitle packet for a trick play service, a maximum tier number indicating a tier number of a subtitle packet having the least importance among the one or more subtitle packets, and a trick play service. At least one of the priority information indicating the priority of the subtitle section and the section number indicating the number of the subtitle section. Detailed description thereof will be described later with reference to FIGS. 3, 4, and 7.

According to another embodiment of the present invention, the subtitle data includes one or more subtitle packets, the subtitle packet includes one or more subtitle sections, and the subtitle section includes one sentence of a subtitle. The broadcast signal includes PVR assist subtitle information for performing a trick play of the subtitle data and PVR assist information for performing a trick play of the video data, and the PVR assist subtitle information includes a trick play service. A tier number indicating a priority of the subtitle packet for a maximum tier number indicating a tier number of a subtitle packet having the least importance among the one or more subtitle packets, and a priority of the subtitle section for a trick play service. Priority Definition And at least one of a section number indicating a number of the subtitle section, wherein the PVR assist information indicates whether the video stream portion corresponding to the subtitle packet includes scene change information during a trick play. At least one of the information indicating and the information indicating whether the video stream corresponding to the subtitle packet includes information indicating the end of the video stream may be included. Here, the PVR assist subtitle information may indicate PVR_assist_information_for_subtitle, and the PVR assist information may indicate PVR_assist_information. The priority information may indicate information indicated by the priority field. Detailed description thereof will be described later with reference to FIGS. 8 to 12.

According to another embodiment of the present invention, the PVR assist subtitle information indicates information indicating whether the subtitle packet is displayed for trick play and maximum speed of trick play that can be provided through the subtitle section. It may include at least one of the information. Detailed description thereof will be described later with reference to FIGS. 10 and 11.

According to another embodiment of the present invention, the signaling information may include information indicating that at least one of the PVR assist subtitle information and the PVR assist information is included in the broadcast signal and transmitted. A detailed description thereof will be described later with reference to FIG. 13.

An embodiment of the present invention can provide a method for efficiently displaying XML-based subtitles when trick-playing a video, and implements a function of processing and outputting such XML-based subtitles in a receiver. A method for doing so can be provided. Here, the above-described XML-based subtitle may correspond to a time text markup language (TTML), SMPTE-TT, EBU-TT-D, and the like.

An embodiment of the present invention may provide a trick play for a video stream using a PVR assist information descriptor. According to an embodiment of the present invention, when trick playing a video, a method for supporting trick play of a subtitle in sync with the video may be provided.

One embodiment of the present invention may provide trick play of video using a tier number, a temporal id, and / or a sub-stream. At this time, there is a need for a method for efficiently displaying subtitles, and an embodiment of the present invention can provide a method for efficiently displaying XML-based subtitles when a trick play of a video is provided.

According to an embodiment of the present invention, when transmitting captions based on XML and / or muxing captions based on XML to TS, when the user needs trick play, the caption connected to the video stream can be efficiently output. Signaling method and / or receiver operation accordingly.

According to an embodiment of the present invention, the trick play related signaling information of the subtitle provided in the present specification may be transmitted by being included in an MPEG-2 TS adaptation field, DVB SAD auxiliary data, header extension of a general transport packet, and the like. Here, the above-described trick play related signaling information of the subtitle may indicate information included in PVR_assist_information_for_subtitle and / or PVR_assist_information which will be described later.

Scenario 1 according to an embodiment of the present invention may provide signaling for indicating a tier number of a subtitle packet for each subtitle packet.

Scenario 2 according to an embodiment of the present invention may signal priority information for indicating the priority of the section (priority of the section within the subtitle packet) in the subtitle packet.

Scenario 3 according to an embodiment of the present invention may provide a method of controlling and displaying a start time and / or an end time of a subtitle according to the speed of trick play.

This figure illustrates a method of playing a subtitle when a video frame is skipped at a trick play speed using a temporal ID of HEVC according to an embodiment of the present invention. According to an embodiment of the present invention, since the XML-based subtitle packet does not have timing information for each frame for synchronizing the frame of the video, the synchronization of the video and the subtitle is performed using a frame number that is decoded or skipped by trick play. It may not be possible to match, and even if it is possible, in trick mode the subtitles are displayed for a short time, and therefore the meanings indicated by the subtitles cannot be conveyed properly. For reference, when the caption is transmitted in the TS packet, the embodiment of the present invention may synchronize the caption with the video using the PTS. An embodiment of the present invention may signal the priority of the subtitle packet and / or the priority of the section in the subtitle packet in order to properly display the subtitle when providing the Trick play service. Thus, only some packets and / or some sections of a subtitle can be played.

In the present specification, although the video stream is an HEVC stream, it is illustrated and / or described as an example. However, even when the video stream is a stream encoded with another codec, if it is a service that provides xml subtitles, one of the present invention herein The embodiment can be equally applied.

This figure illustrates a method of providing a trick play service when a subtitle packet is included in one subtitle packet according to an embodiment of the present invention. In this case, one embodiment of the present invention may display only a specific subtitle packet while skipping a certain number of subtitle packets during the trick play. According to an embodiment of the present invention, each subtitle packet may include importance information (tier number). According to an embodiment of the present invention, the start time and / or end time information for each subtitle packet may be included as xml data, where the start time and / or end time may be maintained as it is. According to one embodiment of the invention, subtitle packets of low importance (high tier number) may be discarded without being decoded and / or displayed.

In this figure, L2010 indicates the type of coded picture and the presentation order in the HEVC video stream.

In this figure, L2020 represents a temporal ID for each picture of the HEVC video steam. According to an embodiment of the present invention, in the case of an HEVC stream, a trick play service may be provided using a tier number and / or a temporal ID, and in the case of an AVC stream, a trick play service may be provided using a trick play through a tier number. have. In this figure, L2020 shows how the XML subtitle packet is displayed aligned with the video stream during normal play. According to an embodiment of the present invention, when video data and XML subtitles are multiplexed and transmitted in a TS packet, a video stream and a PES packet including a video data and a PES packet including an XML subtitle are transmitted using a PTS. XML subtitles can be synchronized. According to another embodiment of the present invention, a method of synchronizing the internal time of an XML-based subtitle and the PTS of a PES packet including video data may be used. At this time, according to an embodiment of the present invention, an equation such as "PTS = (system_clock_frequency * media time / 300)% 2 ^ 33" may be used based on the clock frequency of the transmission system. According to another embodiment of the present invention, when transmitting captions (XML subtitles) in the form of TS adaptation, the caption packet and the video stream can be synchronized using the TSAP, MPEG TEMI, etc., and the captions in ISOBMFF form. When transmitting (XML subtitle), it is possible to synchronize the caption packet and the video stream using a composition time or the like.

In this figure, L2030 represents an XML subtitle packet that can be displayed in alignment with a picture decoded during a double speed trick play, a picture skipped, and a video stream. According to an embodiment of the present invention, in the double speed trick play, a picture having the highest temporal ID may be skipped and pictures having the remaining temporal ID may be decoded and displayed. At this time, according to an embodiment of the present invention, in order to deliver meaningful information to the user, even if the XML subtitle packet is not aligned correctly to all video frames, the subtitle packet (subtitle packet having a low tier number) contains important contents. ) Can only be displayed. According to an embodiment of the present invention, a subtitle packet having a high tier number may be discarded without being decoded in a buffer of the receiver according to the speed of Trick Play. According to an embodiment of the present invention, the same method as the case where a video frame is discarded without decoding according to the tier number may be used in a specific process of discarding the subtitle packet without decoding according to the tier number. According to an embodiment of the present invention, in this figure L2030, during double speed trick play, only the picture having 0 as temporal ID, the picture having 1 as temporal ID and the picture having 2 as temporal ID are decoded and Can be displayed. At this time, according to an embodiment of the present invention, only an XML subtitle having 0 as the tier number and an XML subtitle packet having 1 as the tier number may be displayed.

In this figure, L2040 represents an XML subtitle packet that can be displayed in alignment with a picture to be decoded, a picture to be skipped, and a video stream during 4x Trick play. According to one embodiment of the present invention, in this figure L2040, only a picture having 0 as the temporal ID and a picture having 1 as the temporal ID can be decoded and displayed during 4x trick play. At this time, according to an embodiment of the present invention, only the XML subtitle having 0 as the tier number may be displayed.

According to an embodiment of the present invention, a subtitle packet composed of several sentences may be included in one subtitle packet. At this time, one subtitle sentence may correspond to one section. That is, one embodiment of the present invention may display the non-critical section of the entire subtitles by signaling the priority of several sections in one subtitle packet during trick play (scenario 2).

Scenario 2 according to an embodiment of the present invention may be the same as scenario 1 according to the above-described embodiment in that the tier number is used to classify the importance of the subtitle packet. Furthermore, in scenario 2 according to an embodiment of the present invention, when one subtitle packet includes one or more sections, a section in a subtitle packet to be displayed may be selected during a trick play according to the priority of each section. have. That is, scenario 2 according to an embodiment of the present invention may select a subtitle packet and a section in the subtitle packet to be displayed during a trick play using the tier number of the subtitle packet and the priority of the section in the subtitle packet.

In this figure, L3010 indicates the type of coded picture and the presentation order of the HEVC video stream.

In this figure, L3020 represents a temporal ID for each picture of the HEVC video steam. In this figure, L3020 represents XML subtitle packets displayed aligned with the video stream during normal play. At this time, according to an embodiment of the present invention, the XML subtitle packet may include one or more sections. According to an embodiment of the present invention, in this figure, the section L3050 indicated in the first XML subtitle packet (XML Sub. 1 outputted at normal play) has priority over other sections in the first XML subtitle packet. Indicates high sections. Similarly, the section L3060 indicated in the second XML subtitle packet (XML Sub. 2 outputted during normal play) indicates sections having a higher priority than other sections in the second XML subtitle packet.

In this figure, L3030 represents a picture decoded at double speed trick play, a picture skipped, sections in an XML subtitle packet that can be displayed, and sections in an XML subtitle packet that are skipped. According to an embodiment of the present invention, in the double speed trick play, a picture having the highest temporal ID may be skipped and pictures having the remaining temporal ID may be decoded and displayed. At this time, according to an embodiment of the present invention, a section in a subtitle packet having a low priority according to the speed of Trick Play may be discarded without being decoded in the buffer of the receiver. According to an embodiment of the present invention, in this figure L3030, during double speed trick play, only the picture having 0 as temporal ID, the picture having 1 as temporal ID and the picture having 2 as temporal ID are decoded and Can be displayed. At this time, according to an embodiment of the present invention, among the sections in the first XML subtitle packet, a section L3080 having a higher priority may be decoded and displayed, and sections L3070 and L3090 having a relatively lower priority. ) Can be discarded without being decoded. Similarly, a section L3100 having a higher priority among the sections in the second XML subtitle packet may be decoded and displayed, and sections L3110 having a relatively lower priority may be discarded without being decoded.

In this figure, L3040 represents a picture to be decoded at 4x Trick play, a picture to be skipped, sections in an XML subtitle packet that can be displayed, and sections in an XML subtitle packet that are skipped. According to an embodiment of the present invention, in this figure L3040, only pictures having 0 as the temporal ID and pictures having 1 as the temporal ID can be decoded and displayed during 4x trick play. At this time, according to an embodiment of the present invention, a section L3130 having a higher priority among the sections in the first XML subtitle packet may be decoded and displayed, and sections L3120 and L3140 having relatively lower priority. L3150 may be discarded without being decoded. Equally, among the sections in the second XML subtitle packet, a section L3160 having a higher priority may be decoded and displayed, and sections L3170 and L3180 having a relatively lower priority may be discarded without being decoded. have.

According to another embodiment of the present invention, a subtitle service may be provided in a trick play service by using start time information and end time information, which is a time for displaying a subtitle in xml format regardless of the tier number of the subtitle packet. (Scenario 3). For example, according to an embodiment of the present invention, if the transmitting end transmits start time information and end time information for displaying a subtitle during normal play, the same start time information as in normal play is performed during double speed trick play. The end time information cut in half can be transmitted to the receiving end. That is, the receiver outputs all contents included in the xml subtitle packet, but the displayed time may be reduced. According to an embodiment of the present invention, at this time, it is not necessary to perform separate signaling at the transmitting end, and it may be used by converting the end time indicated by the end time information signaled by the receiver into an end time used in trick play.

According to one embodiment of the present invention,

scenarios

1, 2 and / or 3 according to the above-described embodiment may be provided independently, but at low speeds such as double speed trick play, they may be serviced as in the scenario 3 method. At high speeds, such as 8x or 16x, service can be performed in the same manner as in scenario 1 and / or 2.

According to an embodiment of the present invention, one subtitle packet may include one subtitle sentence (L4010, scenario 1). For example, as shown in the drawing (L4010), the first subtitle packet includes the subtitle sentence 1, the second subtitle packet includes the subtitle sentence 2, and the third subtitle packet includes the subtitle sentence 3. And the fourth subtitle packet may include a caption sentence 4.

According to another embodiment of the present invention, one subtitle packet may include one or more subtitle sentences. (L4020, Scenario 2) And, one of the sections present in the subtitle packet may include one subtitle sentence. For example, as shown in the drawing (L4020), the first section included in the first subtitle packet includes the subtitle sentence 1, the second section includes the subtitle sentence 2, and the third section includes the subtitle sentence. 3, and the fourth section may include the caption sentence 4.

In this figure, each of the subtitle sentences included in the subtitle packet shown in L4010 may be the same subtitle sentence as the subtitle sentences included in each of the sections in the first subtitle packet shown in L4020.

This figure shows the difference between the subtitle packet mentioned in scenario 1 and scenario 2 according to the above-described embodiment. L4010 indicates a configuration form of a subtitle packet corresponding to scenario 1 according to the above embodiment, wherein one subtitle packet may include a subtitle that can be displayed at a time. Scenario 1 according to an embodiment of the present invention may display a caption while skipping by trick-placing, subtitle packet. L4020 indicates a configuration form of a subtitle packet corresponding to scenario 2 according to the above-described embodiment, wherein one subtitle packet may include several sentences (that is, several sections). Scenario 2 according to an embodiment of the present invention may display a subtitle while skipping by a section unit in a subtitle packet. According to the present invention, it is possible to output XML-based subtitles in a way that it is possible to convey the meaning of subtitles during trick play.

This figure shows a subtitle packet having a zero as a tier number, a subtitle packet having a 1 as the tier number, and a subtitle packet having a 2 as the tier number, when the maximum tier number is 2; Display all, display only subtitle packets with 0 as tier number and subtitle packets with 1 as tier number (skip subtitle packets with 2 as tier number) during double speed trick play, 4x trick play FIG. 11 is a diagram illustrating an exemplary embodiment in which only subtitle packets having 0 as a tier number are displayed (subtitle packets having 1 as a tier number and subtitle packets having 2 are skipped).

According to an embodiment of the present invention, the tier number of the subtitle packet may match the tier number or temporal ID of the video. That is, in the case of double speed trick play, only the frame having the tier number (or temporal ID) of 0 and the frame having 1 is displayed in the video stream, and the subtitle packet having the tier number of the subtitle of 0 and the subtitle packet having 1 are displayed. You can encode so that the and subtitles sync.

L5010 illustrates a method of playing a subtitle corresponding to a video stream during normal play according to an embodiment of the present invention. Here, the 1st subtitle packet has a 0 as the tier number, the 2nd subtitle packet has a 2 as the tier number, and the 3rd subtitle packet has a tier number. Can have 1 as the number.

L5020 is a diagram showing a set of frames that can be played when a video frame is skipped one by one and a subtitle packet displayed at this time during a double speed trick play according to an embodiment of the present invention. According to an embodiment of the present invention, the receiver checks the tier number of the subtitle packet and discards the subtitle packet (tier number 2) that cannot be displayed in the double speed trick play, and displays only the subtitle packet having the

tier numbers

0 and 1. can do. At this time, according to an embodiment of the present invention, the receiver includes a field indicating whether information such as a scene change and an end of stream is included in a video stream aligned with a corresponding subtitle packet in a video frame related descriptor. You can check and control the displayed time of the subtitle packet. More specifically, the receiver may select a corresponding subtitle packet (1st subtitle packet) for a section including no scene change according to the original start time and end time information (begin / end time) of the corresponding subtitle packet. All can be displayed. Here, the original start time and end time may indicate a start time and an end time for displaying a subtitle during normal play. Thereafter, when the display of the first subtitle packet is finished, the receiver may discard the second subtitle packet having the tier number 2 without displaying the second subtitle packet. Subsequently, when the receiver displays the 3rd subtitle packet having the tier number 1, if there is an end of stream event, the receiver will display the 3rd subtitle packet only until the end of the video. Can be.

L5030 and L5040 illustrate a method of displaying a subtitle packet when there is a scene change and / or an end of stream event during a 4x trick play according to an embodiment of the present invention. According to an embodiment of the present invention, when there is a scene change and / or an end of stream (marked as a scene change O or an end of stream) when playing a 4x trick trick, the receiver transmits the corresponding subtitle packet only up to the part where the event occurs. Can be displayed.

According to one embodiment of the invention, this figure is a diagram depicting scenario 1, which is an embodiment described above, as a target, but the nth subtitle packet shown in this figure may be replaced by an nth section within the subtitle packet. The same contents described above in this drawing may also be applied to scenario 2 which is the above-described embodiment.

According to an embodiment of the present invention, since the tier number should be signaled in the XML subtitle, the tier number and the maximum tier number may be included in the head of the XML subtitle as in L6010, and the tier number and the maximum tier number are as in L6020. Can be included in the body of an XML subtitle.

Referring to L6010, the head of the XML subtitle packet may include information indicating that the subtitle packet has zero as the tier number and the maximum tier number is three.

Referring to L6020, the body of the XML subtitle packet may include information indicating that the subtitle packet has a tier number of 0 and a maximum tier number of 3.

According to an embodiment of the present invention, since the tier number and / or priority should be signaled in the XML subtitle, the tier number and the maximum tier number of the corresponding subtitle packet are included in the head, as in L7010, and each of the sections in the corresponding subtitle packet. The section number and priority of the can be included in the body. According to another embodiment of the present invention, the tier number, maximum tier number, section number and priority may be included in the body as in L7020. According to another embodiment of the present invention, the tier number and the maximum tier number of the corresponding subtitle packet may be signaled in a separated form.

An embodiment of the present invention may define a tt: trickPlay element as a lower element of tt: metadata for a trick play service. The tt: trickPlay element according to an embodiment of the present invention may include an attribute indicating a tier number of a current subtitle packet and / or an attribute indicating a maximum tier number.

Referring to L7010, the head of the XML subtitle packet may include information indicating that the subtitle packet has zero as the tier number and the maximum tier number is three. Furthermore, the body of the XML subtitle packet may signal the section number and priority for four sections present in the subtitle packet. In this figure, we see that the section number 1 has priority 0, the section number 2 has priority 2, the section number 3 has priority 1, and the section number 4 has priority 3 Can be. In this case, one section may represent one sentence subtitle.

Referring to L7020, the body of the XML subtitle packet may signal a tier number, a maximum tier number, a section number, and a priority for four sections existing in the corresponding subtitle packet. In this case, since all four sections are included in one subtitle packet, the tier number and the maximum tier number may be the same. In this figure, we see that the section number 1 has priority 0, the section number 2 has priority 2, the section number 3 has priority 1, and the section number 4 has priority 3 Can be. According to an embodiment of the present invention, one subtitle packet includes a subtitle composed of one or more sentences. At the same time, one subtitle packet may include one or more sections. One section may represent one sentence of the entire subtitle.

According to an embodiment of the present invention, when muxing an XML subtitle into a TS packet, an XML subtitle packet (XML Sub. ES) is included in a payload of a PES packet, and the PES packet is included in a payload of a TS packet. Can be sent. In this case, the tier number and / or the maximum tier number information of the XML subtitle packet may be included in the header of the TS packet. According to an embodiment of the present invention, the PES packet may include a payload including an XML subtitle packet and a PES header, and the TS packet may include a payload including a PES packet and a TS header.

According to an embodiment of the present invention, the XML subtitle packet may be divided into one or more sections and included in the PES payload. For example, the first subtitle packet XML Sub. ES 1, L8010 may include four sections, and the second subtitle packet XML Sub. ES 2, L8020 may include six sections. have.

According to an embodiment of the present invention, when an XML-based subtitle is muxed and transmitted as a TS packet, the priority of a section in the XML subtitle may be signaled in the XML subtitle.

Referring to L9010, the body of the first XML subtitle packet (XML Sub. ES 1, L9010) may signal the section number and priority for four sections present in the corresponding subtitle packet. In this figure, we see that the section number 1 has priority 0, the section number 2 has priority 2, the section number 3 has priority 1, and the section number 4 has priority 3 Can be. In this case, one section may represent one sentence subtitle.

Looking at L9020, the body of the second XML subtitle packet (XML Sub. ES 2, L9020) may signal the section number and priority for the six sections present in the subtitle packet. In this figure, a section number 1 has a priority 0, a section number 2 has a priority 3, a section number 3 has a priority 2, a section number 4 has a priority 1, a section number 5 It can be seen that the in section has priority 4 and the section number 6 has priority 5. In this case, one section may represent one sentence subtitle.

According to another embodiment of the present invention, the body of the XML subtitle packet may include not only the section number and priority of the corresponding section, but also the total number of sections included in the corresponding XML subtitle packet, the tier number of the corresponding XML subtitle packet, and / Or a maximum tier number.

According to an embodiment of the present invention, when the previous drawings and the present drawings are combined, when the XML subtitles are muxed and transmitted as TS packets, the tier number and / or the maximum tier number information of the XML subtitle packets may be determined by the TS packets. The priority information of each of the sections included in the header and included in the XML subtitle packet may be included in a body part inside the XML subtitle packet.

One embodiment of the present invention can provide a signaling method for which section of subtitles are to be displayed for trick play at all speeds. According to an embodiment of the present invention, a trick play service may be provided for subtitles using the same method as the tier framework provided for trick play of a video stream in all existing supported speeds. Here, the tier framework refers to a framework that supports trick play at all speeds by including information such as decoding / display / discardable frames in all video frames. An embodiment of the present invention may signal tier_num_of_subtitle information indicating the importance of each subtitle packet with respect to all subtitle packets. A transmitter according to an embodiment of the present invention may assign a tier number to a subtitle packet in order to control the speed of the trick play service and / or to effectively convey the subtitles.

The PVR_assist_information_for_subtitle data field according to an embodiment of the present invention may include a data_field_tag field, a data_field_length field, a support_trick_play_flag field, a max_tier_num_of_subtitle field, and / or a tier_num_of_subtitle field. Here, according to an embodiment of the present invention, the TS packet may include an adaptation field, the adaptation field may include a private_data_bytes field, and the private_data_bytes field may include one or more data fields. have. The adaptation field may be included in the header of the TS packet. According to an embodiment of the present invention, the PVR_assist_information_for_subtitle data field may correspond to one of the above-described types of data fields.

The data_field_tag field may identify whether this data field is a PVR_assist_information_for_subtitle data field. According to an embodiment of the present invention, data_field_tag of the PVR_assist_information data field for trick play of a video stream may be 0x03, and data_field_tag of the AU_information data field may be 0x02. According to an embodiment of the present invention, the data_field_tag value of the PVR_assist_information_for_subtitle data field may be allocated to 0x05 (L10020). The value of the data_field_tag according to an embodiment of the present invention may reflect the value of the adaptation_field_data_identifier of the adaptation field data descriptor (). The data_field_tag values 0x01, 0x02, and 0x03 according to an embodiment of the present invention may have the same values as b0, b1, and b2 of the adaptation field data identifier of the adaptation field data descriptor included in the ES level descriptor loop of the PMT. Therefore, if the data_field_tag value of the PVR_assist_information_for_subtitle data field according to an embodiment of the present invention is assigned to 0x05, it may be the same as b4 of the adaptation field data identifier.

The data_field_length field represents the length of the corresponding data field.

The support_trick_play_flag field represents whether a corresponding subtitle packet can be displayed during a trick play. According to an embodiment of the present invention, when this field value is 0, the subtitle packet including subtitles may be discarded during trick play without decoding.

The max_tier_num_of_subtitle field represents the tier number of the subtitle packet having the lowest importance. According to an embodiment of the present invention, since this field is additional information that does not need to be signaled for every subtitle packet, it may be signaled for every random access. According to an embodiment of the present invention, the PVR_assist_info_for_subtitle_present_flag field may be newly defined, and the information of the max_tier_num_of_subtitle field may be signaled only when the value of the PVR_assist_info_for_subtitle_present_flag field is 1.

The tier_num_of_subtitle field represents a tier number indicating the importance of a corresponding subtitle packet. This field tier may be the same as the tier for trick play of the video stream. According to one embodiment of the present invention, when going from the high importance level to the low level, the tier number may be allocated in a form increasing from zero. For example, when requesting a double speed trick play, the receiver discards the subtitle packet having the value indicated by the max_tier_num_of_subtitle field as the tier number, and starts / ends the subtitle packet having the remaining tier number in the subtitle packet in advance. end) can be displayed in time.

According to an embodiment of the present invention, in scenario 1 according to the above-described embodiment, one tier number is assigned to one subtitle packet, and the subtitle packet is not decoded or decoded using the tier number according to the speed of the trick play. By discarding the subtitle, the subtitle can be provided by the trick play service. In scenario 2 according to an embodiment of the present invention, when a subtitle of several sentences is displayed over multiple timings in one subtitle packet, subtitles divided into several sections in one subtitle packet are displayed on each timing. You can do that.

The PVR_assist_information_for_subtitle data field according to an embodiment of the present invention may include a data_field_tag field, a data_field_length field, a tier_num_of_packet field, a max_tier_num_of_subtitle field, a num_of_sections field, a section_number field, a priority_of_section field, and / or a max_speed_of_section field.

The data_field_tag field may be the same as the data_field_tag field of scenario 1 according to the above-described embodiment. Furthermore, according to an embodiment of the present invention, the data_field_tag field value of the PVR_assist_information_for_subtitle data field may be assigned a new value such as 0x06. Details of this field have been described above in the previous figures.

The tier_num_of_packet field represents a tier number indicating the importance of a corresponding subtitle packet. The tier indicated by this field may be the same as the tier for trick play of the video stream. According to one embodiment of the present invention, when going from the high importance level to the low level, the tier number may be allocated in a form increasing from zero.

The max_tier_num_of_subtitle field represents the tier number of the subtitle packet having the lowest importance. That is, this indicates the maximum tier number of the corresponding subtitle packet. According to an embodiment of the present invention, by signaling the maximum tier number, the receiver and / or the user can know the maximum speed of the trick play that can be provided using the tier. According to an embodiment of the present invention, since this field is additional information that does not need to be signaled for every subtitle packet, it may be signaled for every random access. According to an embodiment of the present invention, the PVR_assist_info_for_subtitle_present_flag field may be newly defined, and the information of the max_tier_num_of_subtitle field may be signaled only when the value of the PVR_assist_info_for_subtitle_present_flag field is 1.

The num_of_sections field represents the number of sections included in the subtitle packet. According to an embodiment of the present invention, one subtitle packet may be divided into several sections, and such sections may be named section.

The section_number field represents the number of the corresponding section in the corresponding subtitle packet. According to an embodiment of the present invention, one subtitle packet may include one or more sections, and a section_number field value indicating a number of each section may be numbered from 1 to ascending order. According to an embodiment of the present invention, the value of this field may have the same value as the section number value signaled in the XML subtitle. According to an embodiment of the present invention, if only a section priority is signaled without signaling a section number within the XML subtitle, the section_number field may be omitted from this data field.

The priority_of_section field represents the priority of this section. According to an embodiment of the present invention, a subtitle section to be decoded and / or displayed during trick play may be selected using a priority value for each section indicated by this field.

The max_speed_of_section field represents the maximum speed of the trick play service that can be provided to the corresponding section in the corresponding subtitle packet. For example, if 2, 4, and 8x speeds are supported for the section, the max_speed_of_section field value is 8x speed.

PVR_assist_information data field (L12010) is data_field_tag field, data_field_length field, PVR_assist_tier_pic_num field, PVR_assist_block_trick_mode_present_flag field, PVR_assist_pic_struct_present_flag field, PVR_assist_tier_next_pic_in_tier_present_flag field, PVR_assist_substream_info_present_flag field, PVR_assist_extension_present_flag field, PVR_assist_segmentation_info_present_flag field, PVR_assist_tier_m_cumulative_frames_present_flag field, PVR_assist_tier_n_mmco_present_flag field, PVR_assist_reserved_0 field according to an embodiment of the present invention It may include a PVR_assist_seg_id field, a PVR_assist_prg_id field, a PVR_assist_seg_start_flag field, a PVR_assist_seg_end_flag field, a PVR_assist_prg_start_flag field, a PVR_assist_prg_stop_flag field, and / or a PVR_assg_flag_scene field.

The data_field_tag field may represent that the corresponding data field is PVR_assist_information. The data_field_tag field may have 0x03.

The data_field_length field may indicate the length of the PVR_assist_information excluding the data_field_tag field and the data_field_length field.

The PVR_assist_tier_pic_num field may indicate a tier number of a picture related to PVR_assist_information. The minimum tier number may be zero and the maximum tier number may be seven. Tier number 0 can be reserved for future use. According to an embodiment of the present invention, in the case of HEVC, the tier number of the HEVC RAP picture may be 0, and the tier number of all pictures other than the HEVC RAP picture may be a value obtained by adding 1 to the temporal id. According to an embodiment of the present invention, this field may indicate the tier number of pictures included in the video stream, and may be called tier number information. Here, the tier number may be used for signaling the temporal sublayer. PVR_assist_tier_pic_num may be named tier number information.

The PVR_assist_block_trick_mode_present_flag field may have a value of 1 in a non-RAP picture when the value of this field is 1 in a previous RAP picture.

The PVR_assist_pic_struct_present_flag field may have a value of 1 when the video stream is an AVC or HEVC stream and the PVR_assist_pict_struct field is present.

The PVR_assist_tier_next_pic_in_tier_present_flag field may have a value of 1 when the PVR_assist_tier_next_pic_in_tier field exists.

The PVR_assist_substream_info_present_flag field may have a value of 1 when the PVR_assist_substream_info field exists.

The PVR_assist_extension_present_flag field may have a value of 1 in any one of a PVR_assist_segmentation_info_present_flag field, PVR_assist_tier_m_cumulative_frames_present_flag field, PVR_assist_tier_n_mmco_present_flag field, and PVR_assist_temporal_id_info_present_present_flag field.

The PVR_assist_segmentation_info_present_flag field may have a value of 1 when the PVR_assist_segmentation_info field exists. This field may be named segmentation info flag information and may indicate whether information on a segment to which a picture belongs is present.

The PVR_assist_tier_m_cumulative_frames_present_flag field may have a value of 1 when the PVR_assist_tier_m field and the PVR_assist_tier_m_cumulative_frames field exist. In the case of HEVC, this field may be recommended to have a value of zero.

The PVR_assist_tier_n_mmco_present_flag field may have a value of 1 when the PVR_assist_tier_n_mmco field exists. In the case of HEVC, this field may have a value of zero.

The PVR_assist_seg_id field may transmit an id of a segment to which a picture belongs. This field may be named segment identifier information and may indicate an id of a segment to which a picture belongs.

The PVR_assist_prg_id field may transmit the ID of a program to which a picture belongs. This field may be named program identifier information and may indicate an ID of a program to which a picture belongs.

The PVR_assist_seg_start_flag field may have a value of 1 when the picture has a first reproduction order in one segment. This field may be named segment start flag information, and may identify a picture in which a play time order is first in each segment.

The PVR_assist_seg_end_flag field may have a value of 1 when the picture has the last reproduction order in one segment. This field may be named segment and flag information, and may identify the picture in which the playback time order is last in each segment.

The PVR_assist_prg_start_flag field may have a value of 1 when the picture has the first playback order in one program. This field may be named program start flag information, and may identify a picture in which a playback time order is first in each program.

The PVR_assist_prg_stop_flag field may have a value of 1 when the picture has the last playback order in one program. This field may be named program end flag information, and may identify a picture in which each play time sequence is last in each program.

The PVR_assist_scene_change_flag field may have a value of 1 when the first picture is in the playback order of a new scene.

According to an embodiment of the present invention, in trick play, the meaning of the existing field existing in the above-described PVR_assist_information data field may be corrected for efficient subtitle reproduction, and a new field may be added (L12020).

According to an embodiment of the present invention, when the PVR_assist_segmentation_info_present_flag field value is 1, information such as whether a scene change is included in a segment representing a part of a video stream or whether the corresponding segment is the end of a video sequence may be signaled. According to an embodiment of the present invention, when there is a scene change and / or when the video sequence ends, the display of the subtitles can be stopped to prevent the subtitles not being related to the screen from being played.

According to an embodiment of the present invention, the PVR_assist_scene_change_flag field may indicate whether a scene change is included in a video corresponding to a current subtitle packet.

The PVR_assist_information data field according to an embodiment of the present invention may include a PVR_assist_end_of_sequence_flag field. The PVR_assist_end_of_sequence_flag field represents whether information indicating the end of a video sequence is included in a current subtitle packet. Alternatively, this field may indicate whether a scene change is included in the video stream corresponding to the current subtitle packet.

The adaptation_field_data_descriptor L13020 according to an embodiment of the present invention may provide a method for indicating the type of data fields located in the private data field in the adaptation field. This descriptor can be included in the stream loop of the PMT. The adaptation_field_data_descriptor L13020 may include a descriptor tag, a descriptor length, and / or an adaptation field data identifier. The descriptor tag may identify this descriptor and may have a value of 0x70 as an identification of adaptation_field_data_descriptor. descriptor length indicates the length of this descriptor. The adaptation_field_data_identifier may identify data fields transmitted by being included in private data bytes of the adaptation field. The adaptation_field_data_identifier can be expressed in 8 bits, and if each bit value is 1, this indicates that the corresponding data field is supported.

Adaptation_field_data_identifier (L13030) according to an embodiment of the present invention may be represented by 8 bits, b0 (first bit) may indicate whether the announcement switching data field (TS 101 154 [9]) is present in the adaptation field b1 is the presence of the AU_information data field (TS 101 154 [9]), b2 is the presence of the PVR_assist_information_data_field (TS 101 154 [9]), and b3 is the presence of the tsap_timeline (DVB BlueBook A167-2 [i.10]) Whether or not, b4 indicates whether the PVR_assist_information_for_subtitle data field is present, b5, 6, and 7 may indicate reserved_0 for future use according to an embodiment of the present invention. Detailed description of the PVR_assist_information_for_subtitle data field has been described above.

Program map table (L13010) according to an embodiment of the present invention is a table_id field, section_syntax_indicator field, section_length field, program_number field, version_number field, current_next_indicator field, section_number field, last_section_number field, PCR_PID field, program_info_length field, descriptor () , stream_type field, elementary_PID field, ES_info_length field, descriptor () and / or CRC_32 field. The table_id field identifies the type of table. The table_id field may serve to indicate that this table section is a section constituting the PMT. The section_syntax_indicator field represents the format of a table section following this field. If the value of this field is 0, this table section is in short format. If the value of this field is 1, the table section follows the general long format. The section_length field represents the length of this table section. Since the section_length field represents the length from the field to the end of the table section, the actual length of the table section may be 3 bytes plus the value indicated by the sercion_length field. The program_number field identifies each program service or virtual channel existing in the transport stream. The version_number field represents a version number of a private table section. The receiver may find the most recent table section stored in the memory using this field and the current_next_indicator field to be described later. If the value indicated by the current_next_indicator field is 1, this indicates that the currently transmitted table is valid. If 0, the currently transmitted table is not valid now but will be valid later. The section_number field indicates which section of the table this section is. The last_section_number field indicates the sequence number of the last section among the sections configuring the table. The PCR_PID field represents a packet ID in which a program clock reference (PCR) for a program service exists. The program_info_length field represents the length of a descriptor indicating a program information (program_info) that follows. descriptor () means a descriptor indicating information on a program corresponding to the corresponding table section. The stream_type field represents the type of each unit stream constituting the program described in this table. The elementary_PID field indicates a packet ID of each unit stream constituting the program described in this table. The ES_info_length field indicates the length of a descriptor indicating information (ES_info) for each unit stream that follows. The descriptor () means a descriptor indicating information about one unit stream among the unit streams constituting the program described in this table. An adaptation field data descriptor according to an embodiment of the present invention may correspond to this descriptor. The CRC_32 field represents a CRC value used to check whether there is an error in data included in the table section.

An embodiment of the present invention may signal whether information for efficient subtitle reproduction is included in the adaptation field during trick play by including the adaptation field data descriptor in the ES_info loop of the PMT.

A receiving device according to an embodiment of the present invention is MPEG-2 TS DEMUX (L14010), PSI / SI or PSIP Decoder (L14020), Buffer (L14030), Video decoder (L14040), IP or TS DEMUX (L14050), Buffer (L14060), XML parser (L14070), System Clock (L14080), A / V / Sub. Synchronizer (L14090) and / or display processing unit (L14100).

The MPEG-2 TS DEMUX L14010 may receive and demultiplex TS packets including a video stream.

The PSI / SI or PSIP Decoder L14020 may receive and decode PSI / SI or PSIP information from the MPEG-2 TS DEMUX L14010. The PSI / SI or PSIP Decoder L14020 may decode the PMT and / or the adaptation_filed_data_descriptor according to an embodiment of the present invention.

The buffer L14030 may receive a video stream from the MPEG-2 TS DEMUX L14010. According to an embodiment of the present invention, in trick play, video frames that are not decoded and / or played may be discarded in the buffer L14030 without being delivered to the video decoder.

The video decoder L14040 may decode the video frame received from the buffer L14030. According to an embodiment of the present invention, during trick play, only video frames to be decoded and / or played may be selected and decoded by the video decoder L14040.

The IP or TS DEMUX L14050 may receive and demultiplex IP and / or TS packets including subtitles.

The buffer L14060 may receive a subtitle from IP or TS DEMUX L14050. According to an embodiment of the present invention, during trick play, subtitles that are not decoded and / or played may be discarded in the buffer L14060 without being transferred to the XML parser L14070.

The XML parser L14070 may parse the subtitle received from the buffer L14060. According to an embodiment of the present invention, the buffer L14060 and the XML parser L14070 may be operated in one module.

The system clock L14080 may receive time information of an IP packet and / or a TS packet.

A / V / Sub. Synchronizer L14090 receives time information such as PTS from Buffer L14030 and / or Buffer L14060, and receives time information from System Clock L14080 to perform audio, video and / or subtitle synchronization. Can be. According to an embodiment of the present invention, the synchronization of audio, video, and / or subtitles may use a presentation time extension (EXT_ROUTE_PRESENTATION_TIME) that plays a role similar to the PTS included in the route header extension instead of the PTS.

The display processing unit L14100 may receive the decoded video data from the video decoder L14040, and receive and display the subtitle from the XML parser L14070.

In a method for receiving a broadcast signal according to an embodiment of the present invention, receiving a broadcast signal including signaling information including video data, subtitle data and metadata regarding the subtitle data (SL15010), and receiving the received broadcast The method may include extracting the video data, the subtitle data and the signaling information from the signal (SL15020), and / or decoding the extracted video data, the subtitle data and the signaling information (SL15030).

According to another embodiment of the present invention, the subtitle data includes one or more subtitle packets, the subtitle packet includes one sentence of a subtitle, and the subtitle packet includes the subtitle for a trick play service. At least one of a tier number indicating an importance of a title packet and a maximum tier number indicating a tier number of a subtitle packet having the least importance among the one or more subtitle packets may be included. Here, the subtitle data may include an XML subtitle. Detailed description thereof has been given above with reference to FIGS. 2, 4, 5, and 6.

According to another embodiment of the present invention, the subtitle data includes one or more subtitle packets, the subtitle packet includes one or more subtitle sections, and the subtitle section includes one sentence of a subtitle. The subtitle packet may include a tier number indicating an importance of the subtitle packet for a trick play service, a maximum tier number indicating a tier number of a subtitle packet having the least importance among the one or more subtitle packets, and a trick play service. At least one of the priority information indicating the priority of the subtitle section and the section number indicating the number of the subtitle section. Detailed description thereof has been given above with reference to FIGS. 3, 4, and 7.

According to another embodiment of the present invention, the subtitle data includes one or more subtitle packets, the subtitle packet includes one or more subtitle sections, and the subtitle section includes one sentence of a subtitle. The broadcast signal includes PVR assist subtitle information for performing a trick play of the subtitle data and PVR assist information for performing a trick play of the video data, and the PVR assist subtitle information includes a trick play service. A tier number indicating a priority of the subtitle packet for a maximum tier number indicating a tier number of a subtitle packet having the least importance among the one or more subtitle packets, and a priority of the subtitle section for a trick play service. Priority Definition And at least one of a section number indicating a number of the subtitle section, wherein the PVR assist information indicates whether the video stream portion corresponding to the subtitle packet includes scene change information during a trick play. At least one of the information indicating and the information indicating whether the video stream corresponding to the subtitle packet includes information indicating the end of the video stream may be included. Here, the PVR assist subtitle information may indicate PVR_assist_information_for_subtitle, and the PVR assist information may indicate PVR_assist_information. The priority information may indicate information indicated by the priority field. Detailed description thereof has been given above with reference to FIGS. 8 to 12.

According to another embodiment of the present invention, the PVR assist subtitle information indicates information indicating whether the subtitle packet is displayed for trick play and maximum speed of trick play that can be provided through the subtitle section. It may include at least one of the information. Detailed description thereof has been given above with reference to FIGS. 10 and 11.

According to another embodiment of the present invention, the signaling information may include information indicating that at least one of the PVR assist subtitle information and the PVR assist information is included in the broadcast signal and transmitted. Detailed description thereof has been given above with reference to FIG. 13.

The broadcast signal transmission apparatus L16010 according to an embodiment of the present invention includes an encoder L16020 for encoding signaling information including video data, subtitle data, and metadata regarding the subtitle data, the encoded video data, It may include a generator (L16030) for generating a broadcast signal including the subtitle data and signaling information and / or a transmitter (L16040) for transmitting the generated broadcast signal.

According to another embodiment of the present invention, the subtitle data includes one or more subtitle packets, the subtitle packet includes one sentence of a subtitle, and the subtitle packet includes the subtitle for a trick play service. At least one of a tier number indicating an importance of a title packet and a maximum tier number indicating a tier number of a subtitle packet having the least importance among the one or more subtitle packets may be included.

The broadcast signal receiving apparatus L17010 according to an embodiment of the present invention includes a receiver L17020 for receiving a broadcast signal including signaling information including video data, subtitle data and metadata regarding the subtitle data, and And an extractor L17030 for extracting the video data, the subtitle data and the signaling information from the received broadcast signal, and / or a decoder L17040 for decoding the extracted video data, the subtitle data and the signaling information. . Here, the receiver and / or extractor may be included in the aforementioned MPEG-2 TS DEMUX unit, and the decoder may include the aforementioned PSI / SI or PSIP decoder, a video decoder and / or an XML parser.

A module, unit, or block according to embodiments of the present invention may be a processor / hardware that executes successive procedures stored in a memory (or storage unit). Each step or method described in the above embodiments may be performed by hardware / processors. In addition, the methods proposed by the present invention can be executed as code. This code can be written to a processor readable storage medium and thus read by a processor provided by an apparatus according to embodiments of the present invention.

For convenience of description, each drawing is divided and described, but it is also possible to design a new embodiment by merging the embodiments described in each drawing. And, according to the needs of those skilled in the art, it is also within the scope of the present invention to design a computer-readable recording medium having a program recorded thereon for executing the embodiments described above.

Apparatus and method according to the present invention is not limited to the configuration and method of the embodiments described as described above, the above-described embodiments may be selectively all or part of each embodiment so that various modifications can be made It may be configured in combination.

On the other hand, the image processing method of the present invention can be implemented as a processor-readable code on a processor-readable recording medium provided in the network device. The processor-readable recording medium includes all kinds of recording devices that store data that can be read by the processor. Examples of the processor-readable recording medium include ROM, RAM, CD-ROM, magnetic tape, floppy disk, optical data storage device, and the like, and may also be implemented in the form of a carrier wave such as transmission over the Internet. . The processor-readable recording medium can also be distributed over network coupled computer systems so that the processor-readable code is stored and executed in a distributed fashion.

In addition, although the preferred embodiment of the present invention has been shown and described above, the present invention is not limited to the above-described specific embodiment, the technical field to which the invention belongs without departing from the spirit of the invention claimed in the claims. Of course, various modifications can be made by those skilled in the art, and these modifications should not be individually understood from the technical spirit or the prospect of the present invention.

In addition, in this specification, both the object invention and the method invention are described, and description of both invention can be supplementally applied as needed.

Various embodiments have been described in the best mode for carrying out the invention.

The present invention is used in the field of providing a series of broadcast signals.

It will be apparent to those skilled in the art that various changes and modifications can be made in the present invention without departing from the spirit or scope of the invention. Accordingly, it is intended that the present invention cover the modifications and variations of this invention provided they come within the scope of the appended claims and their equivalents.

Claims

Encoding signaling information comprising video data, subtitle data and metadata relating to the subtitle data;

Generating a broadcast signal including the encoded video data, subtitle data and signaling information; And

Transmitting the generated broadcast signal;

Broadcast signal transmission method comprising a.
The method of claim 1, wherein the subtitle data includes one or more subtitle packets, the subtitle packet including a sentence of a subtitle,

The subtitle packet includes at least one of a tier number indicating an importance of the subtitle packet for a trick play service and a maximum tier number indicating a tier number of the least important subtitle packet among the one or more subtitle packets. Broadcast signal transmission method.
The method of claim 1, wherein the subtitle data includes one or more subtitle packets, the subtitle packet includes one or more subtitle sections, the subtitle section includes one sentence of a subtitle,

The subtitle packet is a tier number indicating an importance of the subtitle packet for a trick play service, a maximum tier number indicating a tier number of a subtitle packet having the least importance among the at least one subtitle packet, and the trick number service for the trick play service. And at least one of priority information indicating a priority of a subtitle section and a section number indicating a number of the subtitle section.
The method of claim 1, wherein the subtitle data includes one or more subtitle packets, the subtitle packet includes one or more subtitle sections, the subtitle section includes one sentence of a subtitle,

The broadcast signal includes PVR assist subtitle information for performing a trick play of the subtitle data and PVR assist information for performing a trick play of the video data.

The PVR assist subtitle information includes a tier number indicating a importance level of the subtitle packet for a trick play service, a maximum tier number indicating a tier number of a subtitle packet having the least importance among the one or more subtitle packets, and a trick play service. At least one of priority information indicating a priority of the subtitle section and a section number indicating a number of the subtitle section,

The PVR assist information includes information indicating whether or not the video stream portion corresponding to the subtitle packet includes scene change information during trick play and a video stream portion corresponding to the subtitle packet during trick play. A broadcast signal transmission method comprising at least one of information indicating whether information indicating the end of a stream is included.
The method of claim 4, wherein

The PVR assist subtitle information includes a broadcast signal including at least one of information indicating whether the subtitle packet is displayed for trick play and information indicating a maximum speed of trick play that can be provided through the subtitle section. Transmission method.
The method of claim 4, wherein

The signaling information includes information indicating that at least one of the PVR assist subtitle information and the PVR assist information is included in the broadcast signal and transmitted.
Receiving a broadcast signal comprising signaling information including video data, subtitle data and metadata relating to the subtitle data;

Extracting the video data, subtitle data and signaling information from the received broadcast signal; And

Decoding the extracted video data, subtitle data and signaling information;

Broadcast signal receiving method comprising a.
8. The method of claim 7, wherein the subtitle data includes one or more subtitle packets, and the subtitle packet includes one sentence of a subtitle.

The subtitle packet includes at least one of a tier number indicating an importance of the subtitle packet for a trick play service and a maximum tier number indicating a tier number of the least important subtitle packet among the one or more subtitle packets. Method of receiving broadcast signal.
8. The method of claim 7, wherein the subtitle data includes one or more subtitle packets, the subtitle packet includes one or more subtitle sections, the subtitle section including one sentence of a subtitle,

The subtitle packet is a tier number indicating an importance of the subtitle packet for a trick play service, a maximum tier number indicating a tier number of a subtitle packet having the least importance among the at least one subtitle packet, and the trick number service for the trick play service. And at least one of priority information indicating a priority of a subtitle section and a section number indicating a number of the subtitle section.
8. The method of claim 7, wherein the subtitle data includes one or more subtitle packets, the subtitle packet includes one or more subtitle sections, the subtitle section including one sentence of a subtitle,

The broadcast signal includes PVR assist subtitle information for performing a trick play of the subtitle data and PVR assist information for performing a trick play of the video data.

The PVR assist subtitle information includes a tier number indicating a importance level of the subtitle packet for a trick play service, a maximum tier number indicating a tier number of a subtitle packet having the least importance among the one or more subtitle packets, and a trick play service. At least one of priority information indicating a priority of the subtitle section and a section number indicating a number of the subtitle section,

The PVR assist information includes information indicating whether or not the video stream portion corresponding to the subtitle packet includes scene change information during trick play and a video stream portion corresponding to the subtitle packet during trick play. A broadcast signal receiving method comprising at least one of information indicating whether information indicating the end of a stream is included.
The method of claim 10,

The PVR assist subtitle information includes a broadcast signal including at least one of information indicating whether the subtitle packet is displayed for trick play and information indicating a maximum speed of trick play that can be provided through the subtitle section. Receiving method.
The method of claim 10,

The signaling information includes information indicating that at least one of the PVR assist subtitle information and the PVR assist information is included in the broadcast signal and transmitted.
An encoder for encoding signaling information comprising video data, subtitle data and metadata relating to the subtitle data;

A generator configured to generate a broadcast signal including the encoded video data, subtitle data and signaling information; And

A transmitter for transmitting the generated broadcast signal;

Broadcast signal transmission apparatus comprising a.
15. The method of claim 13, wherein the subtitle data includes one or more subtitle packets, the subtitle packets including one sentence of a subtitle,

The subtitle packet includes at least one of a tier number indicating an importance of the subtitle packet for a trick play service and a maximum tier number indicating a tier number of the least important subtitle packet among the one or more subtitle packets. Broadcast signal transmission device.
A receiver configured to receive a broadcast signal including signaling information including video data, subtitle data, and metadata regarding the subtitle data;

An extraction unit for extracting the video data, subtitle data and signaling information from the received broadcast signal; And

A decoder for decoding the extracted video data, subtitle data and signaling information;

Broadcast signal receiving apparatus comprising a.