KR102065035B1 - Server, method and media play device for providing time shift service - Google Patents

Abstract

A server for providing a time shift service comprises a receiving part for receiving an image stream of a broadcast image from a broadcast server, a storage part for storing the received image stream in a predetermined buffer unit, a determination part for determining whether the image stream stored in the buffer exceeds a predetermined unit playback time, a request part for receiving a time shift request for the broadcast image from a media playback device, a detection part which detects a buffer corresponding to the visual information of the playback time point requested by the time shift among a plurality of buffers in which the image stream is stored, and a providing part for providing the image stream stored in the detected buffer to the media playback device. The storage part stores the image stream in the buffer according to a determination result of the determination part. Therefore, the present invention allows a user to play from a desired playback time.

Description

SERVER, METHOD AND MEDIA PLAY DEVICE FOR PROVIDING TIME SHIFT SERVICE}

The present invention relates to a server, a method and a media playback apparatus for providing a time shift service.

IPTV (Internet Protocol Television) is a two-way broadcasting and communication service that provides various video contents such as movies and broadcasting programs and various multimedia contents such as Internet search to a television receiver using a high-speed internet network. Viewers can use the remote control to receive various contents and additional services provided by the Internet such as movie watching, home shopping, home banking, online games, MP3, etc. from IPTV.

Recently, IPTV provides a service that allows a user to resume viewing from a point in time desired by a user through a time shift function, such as pausing, rewinding, and fast forwarding while watching a real-time channel.

In relation to such a time shift function, Korean Patent Laid-Open Publication No. 2008-0050477 discloses a method, apparatus, and system for implementing a time shift television.

However, if the user wants to move to the desired viewing point and provide the video through the time shift function, the user may be unable to match the video or the audio, or the packet may be dropped due to a packet drop in a muxer. It has a disadvantage in that it becomes difficult to provide an image corresponding to a desired viewing point.

The present invention provides a server, a method, and a media playback apparatus that provide a time shift service for storing a video stream of a real-time channel in real time to be played from a desired playback time point.

When the time shift service is requested from the user, the internal time information of the video stream corresponding to the time information of the playback time is searched based on the time information of the playback time when the time shift service is requested to correspond to the position of the playback time desired by the user. The present invention provides a server, a method, and a media playback device for providing a time shift service for accurately providing a video stream.

The present invention provides a server, a method, and a media playback device that provide a time shift service for a user to search for a missed portion of a real-time channel and view the missed portion again.

Provides the video stream corresponding to the position of the playback time point desired by the user by mapping the absolute time information corresponding to the start time of the video stream and the internal time information of the frame constituting the video stream, but is fixed in the internal time information of the frame. Server, a method for providing a time shift service to accurately provide a video stream by updating the mapping information when the mapping information is misaligned due to a periodic reset or a packet drop caused by a transmission packet. And a media playback device.

 However, the technical problem to be achieved by the present embodiment is not limited to the technical problems as described above, and other technical problems may exist.

As a means for achieving the above technical problem, an embodiment of the present invention, a receiver for receiving a video stream of a broadcast video from a broadcast server, a storage unit for storing the received video stream in a predetermined buffer unit, the buffer A determination unit for determining whether the video stream stored in the storage unit exceeds a preset unit playback time, a request unit for requesting a time shift for the broadcast video from a media playback device, and performing the time shift among a plurality of buffers in which the video stream is stored. A detector which detects a buffer corresponding to the time information of the requested playback time point, and a providing unit which provides an image stream stored in the detected buffer to the media player, wherein the storage unit is configured to determine the image stream according to a determination result of the determination unit. Storing a time shift service providing server in the buffer Can provide.

According to another embodiment of the present invention, receiving a video stream of a broadcast video from a broadcast server, determining whether the received video stream exceeds the unit playback time set in the buffer, the video stream is the unit Storing the video stream in the buffer according to whether a play time is exceeded; receiving a time shift request for the broadcast video from a media playback device; receiving the time shift request from among a plurality of buffers in which the video stream is stored A method of providing a time shift service may include detecting a buffer in which one video stream corresponding to time information of a playback time is stored and providing the video stream stored in the detected buffer to the media player. have.

According to another embodiment of the present invention, an image receiver for receiving an image stream of a broadcast image from a broadcast server, displays the received image stream in a first area of the display, and displays a timeline for the broadcast image. A display unit displayed in two regions, a request unit requesting a time shift service for the broadcast video through movement of a playback time point for the timeline, and providing time shift service time information of the playback time point for which the time shift is requested And a transmitting unit for transmitting to a server and a receiving unit for receiving the video stream of the time-shifted playback time from the time shift service providing server, wherein the video stream is stored in the buffer based on whether or not the unit playback time set in the buffer is exceeded. The time shift of the stored plurality of buffers Is any one of a video stream is stored in the buffer corresponding to the time information of received blue playback position detection can be provided to the media reproduction apparatus is a video stream stored on the detected buffer provided.

The above-mentioned means for solving the problems are merely exemplary, and should not be construed to limit the present invention. In addition to the exemplary embodiments described above, there may be additional embodiments described in the drawings and detailed description of the invention.

According to any one of the above-described means for solving the problems of the present invention, it is possible to provide a server, a method and a media playback apparatus for providing a time shift service for storing a video stream of a real-time channel in real time to be played from a desired playback point of time. have.

When the time shift service is requested from the user, the internal time information of the video stream corresponding to the time information of the playback time is searched based on the time information of the playback time when the time shift service is requested to correspond to the position of the playback time desired by the user. A server, a method, and a media playback apparatus for providing a time shift service for accurately providing a video stream can be provided.

A server, a method, and a media playback device for providing a time shift service for allowing a user to search for a missed portion of a real-time channel and view it again from the missed portion can be provided.

Provides the video stream corresponding to the position of the playback time point desired by the user by mapping the absolute time information corresponding to the start time of the video stream and the internal time information of the frame constituting the video stream, but is fixed in the internal time information of the frame. Server, a method for providing a time shift service to accurately provide a video stream by updating the mapping information when the mapping information is misaligned due to a periodic reset or a packet drop caused by a transmission packet. And a media playback device.

1 is a block diagram of a system for providing time shift service according to an embodiment of the present invention.
2 is a block diagram of a time shift service providing server according to an exemplary embodiment of the present invention.
FIG. 3 is an exemplary diagram for explaining a process of mapping absolute time information of an image stream and internal time information of a frame constituting a video stream according to an embodiment of the present invention.
4 is a flowchart illustrating an operation of creating a session for providing a time shift service according to an embodiment of the present invention.
5 is a flowchart illustrating a method of storing an image stream in a buffer in a server for providing a time shift service according to an embodiment of the present invention.
6 is a diagram illustrating a method of providing a video stream stored in a detected buffer by detecting a buffer corresponding to time information of a playback time when a time shift is requested from a media playback apparatus in a time shift service providing server according to an embodiment of the present invention; Flowchart.
7 is a flowchart illustrating a method of providing a time shift service in a time shift service providing server according to an embodiment of the present invention.
8 is a block diagram of a media playback apparatus according to an embodiment of the present invention.
9 is a flowchart illustrating a method of providing a time shift service in a media playback apparatus according to an embodiment of the present invention.

DETAILED DESCRIPTION Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings so that those skilled in the art may easily implement the present invention. As those skilled in the art would realize, the described embodiments may be modified in various different ways, all without departing from the spirit or scope of the present invention. In the drawings, parts irrelevant to the description are omitted in order to clearly describe the present invention, and like reference numerals designate like parts throughout the specification.

Throughout the specification, when a part is "connected" to another part, this includes not only "directly connected" but also "electrically connected" with another element in between. . In addition, when a part is said to "include" a certain component, which means that it may further include other components, except to exclude other components, unless specifically stated otherwise, one or more other features It is to be understood that the present disclosure does not exclude the possibility of the presence or the addition of numbers, steps, operations, components, parts, or combinations thereof.

In the present specification, the term 'unit' includes a unit realized by hardware, a unit realized by software, and a unit realized by both. In addition, one unit may be realized using two or more pieces of hardware, and two or more units may be realized by one piece of hardware.

Some of the operations or functions described as being performed by a terminal or a device in the present specification may instead be performed in a server connected to the terminal or device. Similarly, some of the operations or functions described as being performed by the server may be performed by a terminal or a device connected to the server.

Hereinafter, an embodiment of the present invention will be described in detail with reference to the accompanying drawings.

1 is a block diagram of a system for providing time shift service according to an embodiment of the present invention. Referring to FIG. 1, the time shift service providing system 1 may include a broadcast server 110, a time shift service providing server 120, and a media playback device 130. The broadcast server 110, the time shift service providing server 120, and the media playback device 130 exemplarily illustrate components that can be controlled by the time shift providing system 1.

Each component of the time shift service providing system 1 of FIG. 1 is generally connected via a network. For example, as illustrated in FIG. 1, the media playback device 130 may be connected to the time shift service providing server 120 at the same time or at a time interval.

A network refers to a connection structure capable of exchanging information between nodes such as terminals and servers, and includes a local area network (LAN), a wide area network (WAN), and the Internet (WWW: World). Wide Web), wired / wireless data communication network, telephone network, wired / wireless television communication network, and the like. Examples of wireless data networks include 3G, 4G, 5G, 3rd Generation Partnership Project (3GPP), Long Term Evolution (LTE), World Interoperability for Microwave Access (WIMAX), Wi-Fi, Bluetooth communication, Infrared communication, Ultrasound Communication, visible light communication (VLC), liFi (LiFi), and the like, but are not limited thereto.

The broadcast server 110 may transmit the video stream of the broadcast video to the time shift service providing server 120. In addition, the broadcast server 110 may transmit the video stream of the broadcast video to the media playback device 130.

The time shift service providing server 120 may receive an image stream of a broadcast video from the broadcast server 110.

The time shift service providing server 120 may extract internal time information of frames constituting the video stream from the video stream. At this time, the time shift service providing server 120 may map the absolute time information corresponding to the start time of the video stream and the extracted internal time information.

The time shift service providing server 120 may store the received video stream in a predetermined buffer unit. For example, the time shift service providing server 120 may determine whether the video stream stored in the buffer exceeds a preset unit playback time, and store the video stream in the buffer according to the determination result. In this case, when the video stream exceeds the unit playback time set in the buffer, the time shift service providing server 120 may further determine whether the internal time information of the video stream is continuous. For example, when the internal time information of the video stream is continuous, the time shift service providing server 120 may generate a new buffer and store the video stream in the new buffer generated. For another example, when the internal time information of the video stream is discontinuous, the time shift service providing server 120 may update mapping information in which absolute time information of the video stream and internal time information of the video stream are mapped.

The time shift service providing server 120 may provide the internal time information of the video stream stored in the buffer, the mapping information in which the absolute time information of the video stream and the internal time information of the video stream are mapped, the number of fragments of the video stream, and the time shift service. Total time information and the like can be stored as metadata.

The time shift service providing server 120 may manage index information of the video stream based on the stored metadata. The index information may include a first index including at least one of absolute time information and a buffer number corresponding to a start point of a video stream, and a second index including packet number and buffer internal time information of each buffer in each buffer. .

The time shift service providing server 120 may receive a time shift request for the broadcast video from the media playback device 130.

The time shift service providing server 120 may detect a buffer corresponding to the time information of the playback time point at which the time shift is requested, among the plurality of buffers in which the video stream is stored. For example, the time shift service providing server 120 may detect a buffer in which any one video stream corresponding to the time information of the playback time when the time shift is requested is stored, from among the plurality of buffers, based on the index information.

The time shift service providing server 120 may provide an image stream stored in the detected buffer to the media playback device 130.

The media playback device 130 may receive an image stream of a broadcast video from the broadcast server 110.

The media playback device 130 may display the received video stream in the first area of the display and display the timeline for the broadcast video in the second area of the display.

The media playback device 130 may receive a request for a time shift service for the broadcast video from the user by moving the playback time point on the timeline.

The media playback device 130 may transmit the time information of the playback time point at which the time shift is requested to the time shift service providing server 120.

The media playback device 130 may receive a video stream of the time shifted playback time from the time shift service providing server 120.

2 is a block diagram of a time shift service providing server according to an exemplary embodiment of the present invention. Referring to FIG. 2, the time shift service providing server 120 includes a receiver 210, an extractor 220, a mapping unit 230, a storage unit 240, a determination unit 250, a requesting unit 260, The detector 270, the provider 280, and the manager 290 may be included.

The receiver 210 may receive an image stream of a broadcast image from the broadcast server 110. For example, the receiver 210 may multi-cast or unicast from the broadcast server 110 through a protocol such as User Datagram Protocol (UDP) or Real-time Transport Protocol (RTP). The video stream of the broadcast video may be received using the same method as described above.

The extractor 220 may extract internal time information of frames constituting the video stream from the video stream. Here, the internal time information of the frame constituting the video stream may include, for example, program reference clock (PCR) information or presentation time stamp (PTS) information. The PCR information is a time stamp in a transport stream that is a timing reference of the decoder and means a time that is a reference for one program. PTS information refers to time information for synchronous reproduction of a video signal and an audio signal in transmission of multimedia data. When the video signal and the audio signal are compressed and transmitted, the time required for compressing and restoring the video signal is longer than the time required for compressing and restoring the audio signal. There is a discrepancy between voice and voice. In order to solve this problem, after decoding the video or audio signal, it is possible to designate the playback time through the PTS information.

The mapping unit 230 may map the absolute time information corresponding to the start time of the video stream and the extracted internal time information. For example, the mapping unit 230 may map absolute time information corresponding to the start time of the video stream and PCR information or PTS information on a frame constituting the video stream.

If the internal time information of the video stream is discontinuous, the mapping unit 230 may update the mapping information to which the absolute time information of the video stream and the internal time information of the video stream are mapped. When the internal time information of the video stream is discontinuous, for example, when the internal time information (for example, PTS or PCR) of the video stream is reset at a predetermined cycle, a muxer or the like is temporarily This may include a case in which a packet drop is generated and the multicast signal is disconnected and then re-received.

For example, if the unit playback time set in the buffer is 3 seconds, if a packet drop of about 3 seconds occurs, when the user visits the buffer based on the playback time when the user requests a time shift, An error occurs. For example, suppose that the index information is configured as [absolute time = 20180709 182528], [unit buffer number = 1200], [PTS = 31813 sec]. If the index information for the next unit buffer consists of [Absolute time = 20180709 182531], [Unit buffer number = 1201], [PTS = 31819 seconds], if the internal time information of the video stream is continuous, 'PTS = 31813' + 3 Seconds', it should be 'PTS = 31816 seconds', but since' PTS = 31819 seconds', it can be seen that a discontinuity of 3 seconds occurred due to packet drop. As such, when searching with only the internal time information of the video stream stored in the buffer, since the user cannot move to the actual frame position corresponding to the desired playback time point, the mapping unit 230 to prevent the error of the mapping information. May update mapping information in which absolute time information of the video stream and internal time information of the video stream are mapped.

When the mapping information is updated, the mapping unit 230 may update time information that can be provided as a time shift service.

The storage unit 240 may store the received video stream in a predetermined buffer unit. In this case, the video stream may be stored in a predetermined buffer unit after encryption processing is performed in real time.

The storage unit 240 may store the image stream in the buffer according to a determination result of whether the image stream stored in the buffer exceeds the preset unit playback time (for example, 3 seconds or 5 seconds) by the determination unit 250. .

When the internal time information of the video stream is continuous, the storage unit 240 may generate a new buffer and store the video stream in the generated new buffer.

The storage unit 240 may store internal time information of the video stream stored in the buffer, mapping information in which the absolute time information of the video stream and the internal time information of the video stream are mapped, the number of fragments of the video stream, and the total time information that can be provided by the time shift service. Etc. can be stored as metadata. Here, the total time information that can be provided by the time shift service may be calculated as the length of the entire buffer.

The determination unit 250 may determine whether the video stream stored in the buffer exceeds a preset unit playback time (eg, 3 seconds or 5 seconds).

If the video stream exceeds the unit playback time set in the buffer, the determination unit 250 may further determine whether the internal time information of the video stream is continuous.

The requester 260 may receive a time shift request for the broadcast image from the media playback device 130.

The detector 270 may detect a buffer corresponding to the time information of the reproduction time point at which the time shift is requested, among the plurality of buffers in which the video stream is stored. Here, the time information of the reproduction time point at which the time shift is requested may be configured as, for example, year-month-date-hour-minute-second (YYYYMMDD HHMMSS).

The detector 270 may detect a buffer in which any one video stream corresponding to the time information of the reproduction time point at which the time shift is requested, is stored among the plurality of buffers based on the index information. The detector 270 may detect a buffer in which an image stream including an I frame and a TS packet corresponding to the time information at the time of reproduction when the user requests a time shift is stored. By detecting the buffer using the index information, the detection unit 270 can quickly and accurately detect the buffer in which the video stream corresponding to the playback time desired by the user among the video streams stored in the plurality of buffers is stored.

For example, suppose that the index information is configured as [absolute time = 20180709 182528], [unit buffer number = 1200], [PTS = 31813 sec].

For example, when the time information of the playback time point at which the user requests time shift is '20180709 182530', the detector 270 moves to the unit buffer number '1200' based on the index information and uses the correct internal time information of the video stream. I can move it. For another example, when the time information at the playback time when the user requests time shift is '20180709 182533', the detector 270 moves to the unit buffer number '1201' based on the index information, and then the PTS value '31819 seconds'. '2 seconds' added to '31821 seconds' can be moved to the frame of the position.

As such, the absolute time information corresponding to the start time of the video stream and the internal time information of the frame constituting the video stream are mapped and managed through the index information, so that the detection unit 270 uses the index information and the mapping information. It is advantageous in that a buffer in which an image stream corresponding to a playback time desired by a user is stored can be detected quickly and accurately.

The provider 280 may provide the media playback device 130 with the image stream stored in the detected buffer. For example, the provider 280 may stream and provide audio data and video data constituting an image stream stored in the detected buffer to the media player 130.

The manager 290 may manage index information of the video stream based on the stored metadata. The index information may include a first index including at least one of absolute time information and a buffer number corresponding to a start point of a video stream, and a second index including packet number and buffer internal time information of each buffer in each buffer. .

FIG. 3 is an exemplary diagram for explaining a process of mapping absolute time information of an image stream and internal time information of a frame constituting a video stream according to an embodiment of the present invention.

The time shift service providing server 120 may store an image stream in a plurality of buffers 300 according to a preset unit playback time. For example, the time shift service providing server 120 may store the image stream # 1 in the first buffer 301 and store the image stream #N in the Nth buffer 302. In addition, the time shift service providing server 120 may store meta data 303 for the video stream.

For example, the image stream # 1 stored in the first buffer 301 may include audio and video (A / V) data of the image stream # 1 and internal time information of the corresponding frame. here,

The time shift service providing server 120 may map and store the audio and video data 310 and the internal time information 320 for the frame in the video stream stored in the buffer. For example, the time shift service providing server 120 maps and stores audio and video data 310 of the first frame 311 and internal time information of the first frame 321, and stores the N-th frame 312. Audio and video data 310 and internal time information of the N-th frame 322 may be stored.

4 is a flowchart illustrating an operation of creating a session for providing a time shift service according to an embodiment of the present invention. Referring to FIG. 4, the time shift service providing system 1 may include a time shift providing server 120 and a media playback device 130.

When the media playback device 130 requests the creation of the time shift service session to the time shift service providing server 120 (S410), the time shift service providing server 120 may respond to the request for creating the time shift service session. There is (S420).

When the media playback device 130 transmits the session control request message for the time shift service to the time shift service providing server 120 (S430), the time shift service providing server 120 sends a session control response message for the time shift service. It may transmit to the media playback device 130 (S440).

Thereafter, the time shift service providing server 120 may transmit an image stream at the time of reproduction, which has received the time shift service request, to the media playback device 130 (S450).

When the media player 130 requests the session check service server 120 to check a session for maintaining the session of the time shift service (S460), the time shift service providing server 120 performs a session check on the time shift service. The session check request may be responded to (S470).

In the above description, steps S410 to S470 may be further divided into additional steps or combined into fewer steps, according to an embodiment of the present invention. In addition, some steps may be omitted as necessary, and the order between the steps may be switched.

5 is a flowchart illustrating a method of storing an image stream in a buffer in a server for providing a time shift service according to an embodiment of the present invention. Referring to FIG. 5, the time shift service providing server 120 may receive an image stream of a broadcast video from the broadcast server 110 (S501).

The time shift service providing server 120 may extract internal time information of frames constituting the video stream from the video stream (S502).

The time shift service providing server 120 may map the absolute time information corresponding to the start time of the video stream and the extracted internal time information (S503).

The time shift service providing server 120 may store the video stream in a buffer in a predetermined unit (S504).

At this time, the time shift service providing server 120 may determine whether the video stream stored in the buffer exceeds a preset unit playback time (S505). For example, when the video stream stored in the buffer does not exceed the preset unit playback time (S506), the video stream may be continuously stored in the buffer (S507). For another example, when the video stream stored in the buffer exceeds a preset unit playback time (S508), the time shift service providing server 120 may further determine whether internal time information of the video stream is continuous ( S509). For example, as a result of determination, when the internal time information of the video stream is continuous (S510), the time shift service providing server 120 may generate a new buffer (S511) and store the video stream in the new buffer (S510). ). For another example, as a result of determination, when the internal time information of the video stream is discontinuous (S513), the time shift service providing server 120 may map mapping information in which absolute time information of the video stream and internal time information of the video stream are mapped. It may be updated (S514).

In the above description, steps S501 to S514 may be further divided into additional steps or combined into fewer steps, according to an embodiment of the present invention. In addition, some steps may be omitted as necessary, and the order between the steps may be switched.

6 is a diagram illustrating a method of providing a video stream stored in a detected buffer by detecting a buffer corresponding to time information of a playback time when a time shift is requested from a media playback apparatus in a time shift service providing server according to an embodiment of the present invention; Flowchart. Referring to FIG. 6, the time shift service providing server 120 may receive a time shift request for a broadcast image from the media playback device 130 (S601).

The time shift service providing server 120 may search the index for the video stream based on the time information of the playback time point at which the time shift is requested (S602).

The time shift service providing server 120 may detect a buffer in which any one video stream corresponding to the time information of the playback time when the time shift is requested is stored among the plurality of buffers based on the index information (S603). For example, when the buffer in which the video stream is stored is not detected (S604), the time shift service providing server 120 may return an error (S605). For another example, when a buffer in which a video stream is stored is detected (S606), the time shift service providing server 120 searches for internal time information of the detected video stream in the buffer (S607), and searches for internal time information. The video stream may be provided to the media player 130 from the corresponding point (S608).

In the above description, steps S601 to S608 may be further divided into additional steps or combined into fewer steps, according to an embodiment of the present invention. In addition, some steps may be omitted as necessary, and the order between the steps may be switched.

7 is a flowchart illustrating a method of providing a time shift service in a time shift service providing server according to an embodiment of the present invention. The method for providing a time shift service in the time shift service providing server 120 shown in FIG. 7 is a time-series process by the time shift service providing system 1 according to the embodiment shown in FIGS. 1 to 6. Include them. Therefore, although omitted below, the present invention also applies to a method of providing a time shift service in the time shift service providing server 120 according to the exemplary embodiment shown in FIGS. 1 to 6.

In operation S710, the time shift providing server 120 may receive an image stream of a broadcast image from the broadcast server 110.

In operation S720, the time shift providing server 120 may determine whether the received video stream exceeds the unit playback time set in the buffer.

In operation S730, the time shift providing server 120 may store the video stream in the buffer depending on whether the video stream exceeds the unit playback time.

In operation S740, the time shift providing server 120 may receive a time shift request for the broadcast image from the media playback device 130.

In operation S750, the time shift providing server 120 may detect a buffer in which any one video stream corresponding to the time information of the playback time when the time shift is requested is stored, from among the plurality of buffers in which the video stream is stored.

In operation S760, the time shift providing server 120 may provide an image stream stored in the detected buffer to the media playback device 130.

In the above description, steps S710 to S760 may be further divided into additional steps or combined into fewer steps, according to an embodiment of the present invention. In addition, some steps may be omitted as necessary, and the order between the steps may be switched.

8 is a block diagram of a media playback apparatus according to an embodiment of the present invention. Referring to FIG. 8, the media playback device 130 may include an image receiver 810, a display unit 820, a requester 830, a transmitter 840, and a receiver 850.

The image receiver 810 may receive an image stream of a broadcast image from the broadcast server 110.

The display unit 820 may display the received video stream in the first area of the display and display the timeline for the broadcast video in the second area of the display.

The requester 830 may receive a time shift service for the broadcast video from the user through the movement of the playback time point on the timeline. The time shift service may include, for example, pause, resume, rewind, forward, seek, replay through selection of a playback time point, and the like. .

The transmitter 840 may transmit the time information of the reproduction time point at which the time shift is requested to the time shift service providing server 120.

The receiver 850 may receive a video stream of a time shifted playback time from the time shift service providing server 120.

9 is a flowchart illustrating a method of providing a time shift service in a media playback apparatus according to an embodiment of the present invention. The method for providing a time shift service in the media playback device 130 shown in FIG. 9 includes the steps processed in time series by the time shift service providing system 1 according to the embodiment shown in FIGS. 1 to 8. do. Therefore, although omitted below, the present invention also applies to a method for providing a time shift service in the media playback apparatus 130 according to the embodiment shown in FIGS. 1 to 8.

In operation S910, the media playback apparatus 130 may receive an image stream of a broadcast image from the broadcast server 110.

In operation S920, the media reproducing apparatus 130 may display the received video stream on the first area of the display, and display a timeline for the broadcast video on the second area of the display.

In operation S930, the media reproducing apparatus 130 may receive a request for a time shift service for the broadcast video from the user by moving the reproduction time point on the timeline.

In operation S940, the media reproducing apparatus 130 may transmit the time information of the reproduction time point at which the time shift is requested to the time shift service providing server 120.

In operation S950, the media playback device 130 may receive a video stream of the time shifted playback time from the time shift service providing server 120.

In the above description, steps S910 to S950 may be further divided into additional steps or combined into fewer steps, according to an embodiment of the present invention. In addition, some steps may be omitted as necessary, and the order between the steps may be switched.

A method for providing a time shift service in a time shift service providing server and a media reproducing apparatus described with reference to FIGS. 1 to 9 includes a computer program stored in a medium executed by a computer or a recording medium including instructions executable by the computer. It may also be implemented in the form. In addition, the method for providing a time shift service in the time shift service providing server and the media playback apparatus described with reference to FIGS. 1 to 9 may be implemented in the form of a computer program stored in a medium executed by a computer.

Computer readable media can be any available media that can be accessed by a computer and includes both volatile and nonvolatile media, removable and non-removable media. In addition, the computer readable medium may include a computer storage medium. Computer storage media includes both volatile and nonvolatile, removable and non-removable media implemented in any method or technology for storage of information such as computer readable instructions, data structures, program modules or other data.

The foregoing description of the present invention is intended for illustration, and it will be understood by those skilled in the art that the present invention may be easily modified in other specific forms without changing the technical spirit or essential features of the present invention. will be. Therefore, it should be understood that the embodiments described above are exemplary in all respects and not restrictive. For example, each component described as a single type may be implemented in a distributed manner, and similarly, components described as distributed may be implemented in a combined form.

The scope of the present invention is shown by the following claims rather than the detailed description, and all changes or modifications derived from the meaning and scope of the claims and their equivalents should be construed as being included in the scope of the present invention. do.

110: broadcast server
120: time shift service providing server
130: media playback device
210: receiver
220: extraction unit
230: mapping unit
240: storage unit
250: judgment
260: request unit
270 detection unit
280: providing part
290: management
810: image receiving unit
820: display unit
830: request unit
840: transmission unit
850: receiver

Claims (19)

A server providing a time shift service,
A receiver which receives an image stream of a broadcast image from a broadcast server;
A storage unit which stores the received video stream in a predetermined buffer unit;
A determination unit determining whether the video stream stored in the buffer exceeds a preset unit playback time;
A request unit for receiving a time shift request for the broadcast video from a media player;
A detector configured to detect a buffer corresponding to time information of a reproduction time point at which the time shift is requested, among a plurality of buffers in which the video stream is stored; And
Providing unit for providing the image stream stored in the detected buffer to the media playback device,
The storage unit stores the video stream in the buffer according to the determination result of the determination unit,
An extraction unit for extracting internal time information of frames constituting the video stream from the video stream;
And a mapping unit configured to map absolute time information corresponding to a start time point of the video stream and the extracted internal time information.
delete delete The method of claim 1,
And the determining unit further determines whether internal time information of the video stream is continuous when the video stream exceeds the unit playback time set in the buffer.
The method of claim 4, wherein
And when the internal time information of the video stream is continuous, the storage unit generates a new buffer and stores the video stream in the generated new buffer.
The method of claim 4, wherein
And when the internal time information of the video stream is discontinuous, the mapping unit updates mapping information in which absolute time information of the video stream and internal time information of the video stream are mapped.
The method of claim 1,
The storage unit may include internal time information of the video stream stored in the buffer, mapping information in which the absolute time information of the video stream and the internal time information of the video stream are mapped, the number of fragments of the video stream, and the whole that can be provided by the time shift service. And at least one of time information is stored as metadata.
The method of claim 7, wherein
Further comprising a management unit for managing the index information for the video stream based on the stored metadata,
The index information includes a first index including at least one of absolute time information corresponding to a start time of the video stream and a buffer number, and a second index including packet number in each buffer and internal time information of the video stream. The time shift service providing server.
The method of claim 8,
The detection unit detects a buffer in which any one video stream corresponding to the time information of the playback time when the time shift is requested from among the plurality of buffers is stored based on the index information,
The providing unit is to provide a video stream stored in the detected buffer to the media playback device, the time shift service providing server.
In the method for providing a time shift service in a time shift service providing server,
Receiving an image stream of a broadcast image from a broadcast server;
Determining whether the received video stream exceeds a unit reproduction time set in a buffer;
Storing the video stream in the buffer according to whether the video stream exceeds the unit playback time;
Receiving a time shift request for the broadcast video from a media player;
Detecting a buffer in which any one video stream corresponding to the time information of the playback time point at which the time shift is requested is stored among the plurality of buffers in which the video stream is stored; And
Providing the video stream stored in the detected buffer to the media playback device;
Extracting internal time information of a frame constituting the video stream from the video stream; And
And mapping the extracted internal time information to absolute time information corresponding to a start time of the video stream.
delete delete The method of claim 10,
The determining may further determine whether the internal time information of the video stream is continuous when the video stream exceeds the unit playback time set in the buffer.
The method of claim 13,
If the internal time information of the video stream is continuous, generating a new buffer and storing the video stream in the generated new buffer.
The method of claim 14,
If the internal time information of the video stream is discontinuous, updating the mapping information in which the absolute time information of the video stream and the internal time information of the video stream are mapped.
The method of claim 10,
The storing may include internal time information of the video stream stored in the buffer, mapping information in which absolute time information of the video stream and internal time information of the video stream are mapped, the number of fragments of the video stream, and the time shift service. And storing at least one of total time information that can be provided as metadata.
The method of claim 16,
The method may further include managing index information of the video stream based on the stored metadata.
The index information includes a first index including at least one of absolute time information corresponding to a start time of the video stream and a buffer number, and a second index including packet number in each buffer and internal time information of the video stream. The time shift service providing method.
The method of claim 17,
The detecting of the buffer may include: detecting a buffer in which any one video stream corresponding to the time information of the reproduction time point at which the time shift is requested among the plurality of buffers is stored, based on the index information,
The providing of the video stream may include providing the video stream stored in the detected buffer to the media player.
A media playback device that provides a time shift service,
An image receiver configured to receive an image stream of a broadcast image from a broadcast server;
A display unit configured to display the received video stream in a first area of a display and to display a timeline for the broadcast video in a second area of the display;
A request unit which receives a time shift service for the broadcast video from a user by moving a reproduction time point with respect to the timeline;
A transmission unit which transmits time information of a reproduction time point at which the time shift is requested, to a time shift service providing server; And
A receiver configured to receive a video stream of the time shifted playback time from the time shift service providing server,
The video stream is stored in the buffer based on whether the unit playback time set in the buffer is exceeded,
A buffer in which any one video stream corresponding to the time information of the reproduction time point at which the time shift is requested is stored is detected among the stored buffers,
The video stream stored in the detected buffer is provided,
In the video stream, internal time information of a frame constituting the video stream is extracted by the time shift service providing server, and absolute time information corresponding to a start time of the video stream is mapped with the extracted internal time information. Media playback apparatus.

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