KR20050117462A - Information storage medium containing av stream including a graphic data, and reproducing method and apparatus thereof - Google Patents

Abstract

 Disclosed are an information storage medium, a playback method, and a playback apparatus, in which an AV stream including video data, audio data, and graphic data is multiplexed and recorded in an MPEG-2 transport stream format. According to the present invention, an information storage medium for recording an AV stream, the AV stream comprising: at least one video source packet; At least one audio source packet; And at least one additional data source packet, wherein the additional data source packet is disposed after the video source packet having the same output time information. Accordingly, the graphic data corresponding to the video data can be displayed together with the jump of the playback position.

Description

Information storage medium containing AV stream including a graphic data, and reproducing method and apparatus

The present invention relates to an information storage medium, a reproducing method, and a reproducing apparatus in which an AV stream including video data, audio data and graphic data is multiplexed and recorded in an MPEG-2 transport stream format.

1 is a detailed configuration diagram of a video object set.

More specifically, FIG. 1 illustrates a video object set (VOBS) for titles representing actual moving picture data in a Video Title Set (VTS) area to explain composing video data, audio data, and additional data according to the DVD standard. for Title).

Referring to FIG. 1, each VOBS 110 includes a plurality of VOBs (Video Objects) 120-1 to 120-i, and one VOB 120-1 includes a plurality of CELLs 130-1 through. 130-k). One CELL 120-1 is composed of a plurality of video object units (VOBUs) 140. The VOBU 140 is data encoded by MPEG, which is a video encoding method used in a DVD. According to MPEG, since images are space-time compressed and encoded, before or after images are required to decode a certain image. Thus, intra coding is performed at regular intervals that do not require a before or after picture to support a random access function that starts playback at any point in the AV stream. A picture produced by intra coding is called an intra picture or an I-picture, and the sum of the I picture and the pictures up to the next I picture is called a GOP (Group Of Picture). In general, a GOP consists of 12 to 15 pictures.

On the other hand, the MPEG system (ISO / IEC13818-1) describes a method of multiplexing video data and audio data into one bit stream. In the multiplexing method in the MPEG system, video data and audio data are combined into a program stream (PS) optimized to be stored in an information storage medium by combining them into a single program, and a network is formed by creating a plurality of programs. There is a method of multiplexing into a transport stream (TS) made to be suitable for storage through the. On DVD, the video is multiplexed according to the method of multiplexing the program stream. In order to multiplex the program stream, video data or audio data is divided into packs (PCKs), and the divided video PCKs and audio PCKs are multiplexed by a time division multiplexing method. Data other than video and audio data defined in MPEG may be referred to as a private stream and may be divided into PCK units and multiplexed together with video data and audio data.

The VOBU 140 is composed of a plurality of PCKs. The first PCK of the plurality of PCKs is a navigation pack (NV_PCK) 150. Subsequently, the video pack is composed of a video pack (V_PCK) 152, a sub picture pack (SP_PCK) 154, an audio pack (A_PCK) 156, and the like. The video data contained in the video pack (V_PCK) 152 consists of a plurality of GOPs. The sub picture pack (SP_PCK) 154 is for two-dimensional graphic data and subtitle data. That is, in DVD, subtitle data overlapping a video image is encoded in the same manner as 2D graphic data, and the encoded graphic data and the subtitle data are contained in the sub-picture pack 154. Therefore, even if the playback position is jumped and changed, the subpicture is always displayed together with the video and audio since the playback position is reproduced in units of navigation packs.

On the other hand, in the MPEG-2 transport stream, video data, audio data and additional data are multiplexed. However, if the playback position is jumped in the MPEG-2 transport stream, the additional data may not be played together with the video or audio depending on the position of the additional data in the MPEG-2 transport stream.

Accordingly, an object of the present invention is to provide an information storage medium, a reproduction method, and a reproducing apparatus in which an AV stream including video data, audio data, and graphic data is multiplexed and recorded according to the format of an MPEG-2 transport stream. .

According to an aspect of the present invention, there is provided an information storage medium for recording an AV stream, wherein the AV stream includes at least one video source packet; At least one audio source packet; And at least one additional data source packet, wherein the additional data source packet is disposed after the video source packet having the same output time information.

The additional data source packet is presentation graphic data containing subtitle information corresponding to video, and preferably has a PTS as an output start time.

The additional data source packet is interactive graphic data containing information relating to interaction with a menu or a user, and preferably has a PTS as an output start time.

In addition, the technical problem is an information storage medium recording an AV stream, the AV stream comprises at least one video source packet; At least one audio source packet; At least one additional data source packet; And an entry point map that records reproduction time information of a video source packet corresponding to an I picture among the video source packets, wherein the entry point map is a packet of a video source packet to be reproduced corresponding to the reproduction time information. It is also achieved by an information storage medium on which an AV stream is recorded, wherein the number and packet number of the additional data source packet are recorded.

When the playback position is moved to the video source packet indicated by the entry point map, when the source packet at the position is the first entry point of the clip to which the source packet belongs, it is preferable to play from the first source packet of the clip. Do.

On the other hand, according to another field of the present invention, the technical problem includes at least one video source packet, at least one audio source packet and at least one additional data source packet, the additional data source packet is the same output time A reading unit that reads an AV stream disposed after the video source packet having information; A demultiplexer which demultiplexes the read AV stream into a video source packet, an audio source packet, and an additional data source packet; A video decoder for decoding and outputting the video source packet; And an audio decoder for decoding and outputting the audio source packet.

Further, according to another field of the present invention, the technical problem includes (a) at least one video source packet, at least one audio source packet and at least one additional data source packet, wherein the additional data source packet is Reading an AV stream disposed after the video source packet having the same output time information; (b) demultiplexing the read AV stream into video source packets, audio source packets, and additional data source packets; And (c) decoding and outputting the video source packet and the audio source packet.

In addition, the technical problem is (a) receiving a play position change command; (b) In addition to the time information of the I picture in the video source packet and the entry point map recording the packet number of the additional data source packet in addition to the packet number of the I picture, the source packet number of the additional data is included. Determining whether it is in progress; And (c) if the additional data source packet number is included, shifting the playback position to that packet number; otherwise, shifting the playback position to the packet number of the I picture to play the AV stream. This is also achieved by the AV stream reproduction method.

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

FIG. 2 is a diagram illustrating a process of multiplexing a video stream, an audio stream, and other presentation streams into an AV stream and recording the same on a storage medium.

Referring to FIG. 2, the AV stream includes, besides the video stream 202 and the audio stream 204, a presentation graphics stream for representing bitmap-based subtitles for the video and others produced by the producer for a particular purpose. Data stream 206 may be included. It is called an additional data stream, including presentation graphics streams, interactive graphics streams, and other data streams.

The encoded video data, audio data and other data are each made of an elementary stream. The video element stream, audio element stream, and other element streams thus produced are packetized to form a Packetized Elementary Stream (PES). One PES consists of a header field and a PES packet data field. The header field includes the Stream_id information for identifying whether the data recorded in the PES packet data field is video, audio, or other data, the decoding time stamp (DTS), and the presentation time stamp (PTS) of the PES packet. Time information, etc. are recorded.

These PESs are multiplexed to form an MPEG-2 Transport Stream having a size of 188 bytes. A TS packet of 188 bytes consists of a header that records information about the packet, and a payload that records data. The header of the TS packet includes Packet ID information indicating the type of data recorded in the payload, the DTS used to decode and output the data of the PES packet, and the system time clock (STC) of the playback device serving as the reference time of the PTS. And an adaptation field for recording Program Clock Reference (PCR) information and the like for setting.

Next, a 4-byte header is added to the 188-byte TS packet to form a source packet to form an AV stream in which data such as video and audio are recorded. The header of the source packet includes copy permission information recording content protection information of the packet and arrival time stamp information indicating a time when the source packet arrives at the playback device. .

3 is a simplified block diagram of a playback apparatus for playing an AV stream.

The reading unit 310 reads the AV stream from the information storage medium which recorded the AV stream made as described above with reference to FIG. The source packet is transmitted to the demultiplexer 320 according to the arrival time stamp (ATS) recorded in the header of the source packet. The demultiplexer 320 removes the header from the received source packet to form an MPEG-2 TS packet. When the MPEG-2 TS packet header includes program reference clock (PCR) information, the system time clock (STC) 350 of the playback apparatus is set according to the PCR value. Each PES packet is generated by dividing it into a video stream and an audio stream by ID. The STC 350 counts the system clock and continues to increment, and then resets to a value indicated by the PCR, rather than a value that increases sequentially from time to time.

The PES packet is transmitted to the video decoder 330 and the audio decoder 340 when the decoding time stamp (DTS) included in the PES packet header matches the system time clock (STC) 350 of the playback device. When the presentation time stamp (PTS) and the system time clock (STC) 350 of the playback device match, the decoded video data or audio data is output. In this case, a unit of a video stream output at a specific time point is referred to as a video presentation unit (VPU) and a unit of an audio stream is referred to as an audio presentation unit (APU). Also, a video stream unit decoded by each of the decoders 330 and 340 and including data for generating each presentation unit is defined as a video access unit (VAU) and an audio stream unit. Called an Audio Access Unit (AAU).

That is, a DTS and a playback device made of a video access unit (VAU) and an audio access unit (AAU), which are units which are demultiplexed and decoded at a specific point in time, are recorded in each access unit. At the point at which the STCs match, it is sent to the video decoder 330 and the audio decoder 340 and decoded into a video presentation unit (VPU) and an audio presentation unit (APU). The PTS of each presentation unit and the STC of the playback apparatus are output at the point of coincidence. The PTS of the audio stream may mean both the time that the audio access unit (AAU) is input to the audio decoder 340 and the time that is output from the audio decoder 340.

On the other hand, although not shown in Fig. 3, the presentation graphics stream for the bitmap-based subtitle data, like the video stream or the audio stream, is also made of the access unit and the presentation unit, and its DTS and PTS are transferred to the STC of the playback apparatus. It works in sync with video and audio data.

4 is a diagram showing that source packets constituting an AV stream recorded on a storage medium are input to a playback apparatus.

The AV stream is composed of a plurality of source packets, and the header of each source packet includes arrival time stamp (ATS) information, which is time information input to the playback apparatus. The Arrival Time Clock Counter of the playback device is reset to the ATS value of the source packet first inputted to the playback device. Subsequently, the input source packet is inputted to the reproduction apparatus at a time point when the ATS value of the corresponding source packet header is compared with the ATC counter value of the reproduction apparatus. At this time, when the ATS value of each source packet is continuously and continuously, these source packets have the same ATC-Sequence. In general, it is preferable that one AV stream consists of one ATC-Sequence.

FIG. 5 is a diagram for explaining a change in the STC of the playback apparatus when source packets having one ATC-Sequence are input to the playback apparatus.

Each source packet included in one ATC-Sequence is sequentially input to a playback device according to an arrival time stamp (ATS), and then reconstructed into MPEG-2 TS packets. At this time, when the PCR information is included in the header of the MPEG-2 TS packet, the reproducing apparatus resets the system time clock (STC) by using the PCR information. STC-Sequence refers to a sequence of MPEG-2 TS packets controlled by a system time clock (STC) that is incremented continuously by PCR information of a particular MPEG-2 TS packet.

At least one STC-Sequence may be included in one ATC-Sequence, which resets the system time clock (STC) to the first MPEG-2 TS packet of a new STC-Sequence. PCR information should be recorded, at which point a discontinuity in the STC values occurs.

Referring to FIG. 5, when an AV stream having one ATC-Sequence is played back, a global time for setting the start time at which the AV stream is played back to 0 is sequentially increased, while STC-Sequence is # 0. Starting from # 1 and # 2, we can see that each STC-Sequence has a different system time clock (STC).

However, video streams, audio streams, and presentation graphics streams are multiplexed into one AV stream even when the system time clock (STC) is reset due to a discontinuity in the STC-Sequence. This is done by the system time clock (STC) in the STC-Sequence that controls the information.

FIG. 6 is a diagram showing a connection relation between AV information and navigation information for designating a playback order and a playback position of an AV clip recorded on a storage medium.

An AV clip is a recording unit constituting an AV stream. The storage medium includes, in addition to the AV clip, Clip Information for recording attribute information and the like for the AV clip, navigation information, and the like as information representing the playback order of the AV clip. The navigation information includes at least one PlayList including title information of at least one title included in the storage medium and reproduction order information of AV clips reproduced by each title.

Referring to FIG. 6, the PlayList includes one or more PlayItems including reference information for indicating an AV clip to be played. PlayItem is information indicating Clip Information that records attribute information of an AV clip to be used for playback, and a STC-Sequence including Clip_info_file and the system time clock (STC) of the AV clip indicated by PlayItem on the corresponding AV clip. Ref_to_STC_id indicating the number of, and IN_time and OUT_time information indicating the start and end of the PlayItem in the STC-Sequence indicated by the PlayItem.

Looking at the playback process of the storage medium having such a data structure, the PlayList indicated by the title to be played is selected, and when the PlayItem included in the selected PlayList is normal playback, it is sequentially selected from the beginning, and in the case of random access Selected sequentially from the specified PlayItem.

When PlayItem # 0 is initially selected, Clip Information # 1 is selected by Clip_info_file = 1 information, and STC-Sequence # 0 is set in the ATC-Sequence of the AV clip indicated by Clip Information # 1 by ref_to_STC_id = 0 information. It is selected and reproduced from the in1 position to the position of out1 indicated by the system time clock (STC) corresponding to STC-Sequence # 0 by IN_time = in1 and OUT_time = out1.

Next, when PlayItem # 1 is selected, Clip Information # 2 is selected by Clip_info_file = 2 information, and STC-Sequence # 0 is selected in the ATC-Sequence of the AV clip indicated by Clip Information # 2 by ref_to_STC_id = 0 information. It is selected and reproduced from the in2 position to the out2 position indicated by the system time clock (STC) corresponding to STC-Sequence # 0 by IN_time = in2 and OUT_time = out2, and the following PlayItems are reproduced in the following manner.

In other words, one PlayList is selected, the PlayItem included in the PlayList is selected to find the position of the AV clip to be played, and the AV clip from the position is transmitted to the playback device according to the arrival time stamp (ATS), The system time clock (STC) of the playback apparatus is reset using MPEG-2 TS packets including PCR information among the transmitted data. After that, the video access unit and the audio access unit start decoding when the presentation time stamp (PTS) included in each access unit coincides with the system time clock (STC) to create a presentation unit, and make each presentation. If the presentation time stamp PTS of the presentation unit coincides with the system time clock STC, it is output.

On the other hand, when the PlayItem goes to the playback position indicated by IN_time in PlayItem, if the playback position is the first I-picture in the clip, playback does not start from the position indicated by IN_time. Playback starts from the beginning of the clip. This is to decode additional data in advance for seamless playback of audio data and video data.

7 is a diagram illustrating an example of an AV clip including video data, audio data, and graphic data.

Referring to FIG. 7, it can be seen that the AV clip includes one video data, three audio data, two presentation graphic data, and two interactive graphic data. The three audio data are audio data each composed of different languages such as English, Korean, and Japanese. The presentation graphic data is data for outputting a graphic such as a subtitle for a moving image as if a subtitle or the like is output from a conventional DVD or the like. In the example of FIG. 7, the presentation graphic data has two presentation graphic data configured in different languages. In addition, the interactive graphic data is data for performing a designated command by receiving an input from a user such as a menu or a button. In the example of FIG. 7, the interactive graphic data has two interactive graphic data configured in different languages.

FIG. 8 is a diagram showing that video data, audio data and graphic data are recorded in an MPEG-2 TS format on an AV clip.

Referring to FIG. 8, each data is made of a packet having a predetermined size, and each packet is not only a video packet, an audio packet, and a graphic packet but also a Program Clock Reference (PCR) packet which is reference time information of a playback device. have. Also, it can be seen that the graphic packet includes an interactive graphic packet and a presentation graphic packet.

When video data is encoded according to the MPEG-2 coding scheme, I, B, and P pictures are created, and these pictures each have a PTS and are arranged in the order of the PTSs. In addition, the audio data is encoded according to a compression coding scheme such as linear pulse coded modulation (LPCM), MPEG-2 audio coding, AC-3, or Digital Teather System (DTS), and arranged in an AV clip. The interactive graphic data and the presentation graphic data are also arranged on the AV clip with PTS which is time information to be output, respectively.

In the present embodiment, only the video data generated according to the MPEG-2 encoding method is mentioned for convenience, but the video data may be made by MPEG-4 or other various video encoding methods in addition to the MPEG-2 encoding method. In this case, the video access unit ( The AV stream construction method of the present invention can be applied even when the position of the source packet on the AV clip in which the first data of the VAU) is recorded as an entry point on the EP_map.

9 is a diagram showing a connection relationship between EP_map information and each I-picture on an AV clip.

The EP_map information is included in the clip information. The EP_map stores PTS information of each I-picture and information on which position on the clip is the I-picture to be output at each PTS time. Here, the position of each I-picture is called an entry point. EP_map () has a plurality of entry points and this information can be used to move to the position of the video to be output to a specific PTS. In addition, it may be used to obtain the range indicated by the corresponding PlayItem on the AV clip according to the IN_time and OUT_time information of the PlayItem included in the PlayList. That is, the range indicated by the PlayItem is from the position on the AV clip for IN_time to the position on the AV clip for OUT_time.

10 is a diagram illustrating an example in which audio, video and graphic packets are arranged on an AV clip.

The I-picture at the position pointed to by entry point x has a PTS value of 100, and presentation graphics data having a PTS value of 100 and interactive graphic data having a PTS value of 100 are placed in front of the I-picture having a PTS value of 100. have. Further, the I-picture at the position indicated by the entry point y has a PTS value 200, and the presentation graphic data having the PTS value 200 and the interactive graphic data having the PTS value 200 are placed before the I-picture having the PTS 200. It is. Similarly, the I-picture at the position indicated by the entry point z has a PTS value 300, and the presentation graphic data having the PTS value 300 is placed before the I-picture having the PTS value 300.

In this case, when the playback device processes the position indicated by the entry point x, the presentation graphic data and the interactive graphic data are already processed and output to the graphics decoder. It is in a waiting state. Accordingly, the video at the position indicated by the entry point x starts to be output at the point of time of the PTS value 100, and is reproduced in the order of presentation graphic data and interactive graphic data being output.

11A to 11C are views showing an output screen when the AV clips constructed as shown in FIG. 10 are sequentially played back.

As shown in FIG. 11A, the screen at the point of time at which the video indicated by the entry point x is outputted is a PTS value 100. As shown in FIG. 11A, the presentation graphic and the interactive graphic are output. Also, it can be seen that the presentation graphic and the interactive graphic are output together with the video as shown in FIG. 11B, when the PTS value 200 is the time point at which the video indicated by the entry point y is output. Also, it can be seen that the presentation graphic is output together with the video as shown in FIG. 11C, when the PTS value 300, which is the point in time at which the video indicated by the entry point z is output, is output.

12A to 12C are diagrams showing an output screen when jumping and reproducing an AV clip configured as shown in FIG.

12A to 12C, unlike the sequential playback, it can be seen that the presentation graphic and the interactive graphic are not output in the playback by jumping to each entry point. This is because of the arrangement order of each video, audio, presentation graphic data and interactive graphic data on the AV clip shown in FIG. That is, in arranging video, presentation graphic data, and interactive graphic data having the same PTS, as shown in FIG. Indicates the position of the I-picture of the video. When jumping to the entry point x for playback, the presentation graphic and the interactive graphic recorded before the position indicated by the entry point x are not output. The same applies to the playback by jumping to the entry point y and the entry point z.

FIG. 13 is a diagram illustrating another example in which audio, video, and graphic packets are arranged on an AV clip.

Referring to FIG. 13, it can be seen that the presentation graphic data and the interactive graphic data having the same PTS as the I-picture of the video are recorded after the I-picture. Therefore, even when jumping to each entry point for reproduction, the interactive graphic data and the presentation graphic data existing after the I-picture are read and output.

Therefore, it is preferable to arrange the presentation graphic data and the interactive graphic data or other additional data configured to be output in synchronization with the video to satisfy the following relationship.

That is, in the case of presentation graphic data, if PTS (Entry Point i) <= PTS (presentation graphic corresponding to Entry Point i), SPN (Entry Point i) <SPN (presentation graphic corresponding to Entry Point i) Should be The SPN is a source packet number, which indicates a position in an AV clip. Similarly in the case of interactive graphic data, if PTS (Entry Point j) <= PTS (Interactive Graphic corresponding to Entry Point j), the relationship between SPN (Entry Point j) <SPN (Interactive Graphic corresponding to Entry Point j) is Should be.

This relationship is not only applied to presentation graphic data or interactive graphic data, but can also be commonly applied to additional data multiplexed on one AV clip and having a PTS value.

14 is a diagram illustrating another example in which audio, video, and graphic packets are arranged on an AV clip.

In FIG. 14, it can be seen that the presentation graphic data and the interactive graphic data may be located before or after the I-picture. Therefore, in some cases, when the playback position of the AV clip configured as shown in FIG. 14 is played back by jumping to the entry point x, if the playback starts from the position of the entry point x, the PTS value 100 of the video data indicated by the entry point x is the same. Since the interactive graphic having the PTS value is not output, the positional information of the graphic data is included in addition to the positional information on the AV stream indicated by the entry point x. This will be described with reference to FIG. 15.

FIG. 15 is a diagram showing an example of EP_map () for recording the position of graphic data in addition to EP_map () which records time and position information of each entry point of video data.

In the conventional EP_map (), each entry point of video data, i.e., a PTS, which is time information on an I-picture, and a source packet number (SPN) indicating a position on an AV stream, are recorded. By further recording the packet number, when jumping and playing back to a specific entry point, it is possible to determine whether the position to start playback is from the start point of the I-picture of the video or from the start point of the graphic data. Referring to FIG. 15, video data, audio data, presentation graphic data, and interactive graphic data are multiplexed on an AV stream, and PTS and SPN information of each I-picture of video data is recorded in EP_map (). In addition, when graphic data having a PTS larger than or equal to the PTS of each I-picture is recorded before the SPN of the I-picture, it can be seen that the SPN value of the graphic data is further recorded.

On the other hand, when the playback position is the first entry point of the clip on the EP map, it is played back from the first source packet number SPN, which is the beginning of the clip.

FIG. 16 is a diagram illustrating a process of changing a playback position of a video by EP_map () shown in FIG. 15.

When the playback device receives a playback position change command such as a time shift or a chapter shift (S1610), the playback apparatus first searches for an entry point corresponding to the position to be changed based on the PTS of the video on the EP_map () (S1620). After the entry point to be moved is found, it is checked whether the entry point includes the graphic SPN (S1630), and if the graphic SPN is recorded, it moves to the position indicated by the graphic SPN (S1640). In step S1650, the video SPN moves to the position indicated by the video SPN. Then, playback starts (S1660).

On the other hand, the above-mentioned reproduction method of the AV stream can be created by a computer program. Codes and code segments constituting the program can be easily inferred by a computer programmer in the art. In addition, the program is stored in a computer readable media, and read and executed by a computer to implement the AV stream reproduction method. The information storage medium includes a magnetic recording medium, an optical recording medium, and a carrier wave medium.

So far I looked at the center of the preferred embodiment for the present invention. Those skilled in the art will appreciate that the present invention can be implemented in a modified form without departing from the essential features of the present invention. Therefore, the disclosed embodiments should be considered in descriptive sense only and not for purposes of limitation. The scope of the present invention is shown in the claims rather than the foregoing description, and all differences within the scope will be construed as being included in the present invention.

As described above, according to the present invention, when the playback position changes, graphic data having a PTS that is greater than or equal to the PTS indicated by any entry point has a value smaller than the SPN indicated by the entry point, that is, before the video data. Even when graphic data is recorded, both video and graphics can be output.

1 is a detailed configuration diagram of a video object set;

2 is a diagram illustrating a process of multiplexing a video stream, an audio stream, and other presentation streams into an AV stream, and recording the same on a storage medium;

3 is a simplified block diagram of a playback apparatus for playing an AV stream;

4 is a view showing that source packets constituting an AV stream recorded on a storage medium are input to a playback apparatus;

5 is a view for explaining a change in the STC of the playback apparatus when source packets having one ATC-Sequence are input to the playback apparatus;

FIG. 6 is a diagram showing a connection relation between AV information and navigation information for designating a playback order and playback position of an AV clip recorded on a storage medium; FIG.

7 illustrates an example of an AV clip including video data, audio data, and graphic data;

8 is a diagram showing that video data, audio data and graphic data are recorded on an AV clip according to MPEG-2 TS format;

9 is a diagram showing a connection relationship between EP_map information and each I-picture on an AV clip;

10 is a diagram illustrating an example in which audio, video, and graphic packets are arranged on an AV clip;

11A to 11C are views showing an output screen when sequentially playing an AV clip configured as shown in FIG. 10;

12A to 12C are views showing an output screen when jumping and reproducing an AV clip configured as shown in FIG. 10;

FIG. 13 is a diagram showing another example in which audio, video and graphic packets are arranged on an AV clip; FIG.

14 is a diagram showing another example in which audio, video, and graphic packets are arranged on an AV clip;

FIG. 15 is a view showing an example of EP_map () for recording the position of graphic data in addition to EP_map () which records time and position information of each entry point of video data; FIG.

FIG. 16 is a diagram illustrating a process of changing a playback position of a video by EP_map () shown in FIG. 15.

Claims (16)

In an information storage medium recording an AV stream, the AV stream is At least one video source packet; At least one audio source packet; And And at least one additional data source packet, wherein the additional data source packet is disposed after the video source packet having the same output time information. The method of claim 1, The output time information included in the additional data source packet is a presentation time stamp (PTS) value representing a time when the decoded additional data is output from a playback device that reproduces the AV stream. Information storage medium. The method of claim 1, wherein the additional data source packet is An information storage medium for recording an AV stream, wherein the presentation graphic data contains subtitle information corresponding to a video, and has a PTS as an output start time. The method of claim 1, wherein the additional data source packet is An interactive graphic data containing information relating to interaction with a menu or a user, the information storage medium having an AV stream having a PTS as its output start time. The method of claim 1, The video source packet, the audio source packet and the additional data source packet are packets of a predetermined size, wherein a header including an arrival time stamp is further added to the MPEG-2 transport stream packet. Information storage medium. In an information storage medium recording an AV stream, the AV stream is At least one video source packet; At least one audio source packet; At least one additional data source packet; And An entry point map that records play time information of a video source packet corresponding to an I picture among the video source packets, wherein the entry point map is a packet number of a video source packet to be played corresponding to the play time information. And a packet number of the additional data source packet. The method of claim 6, When the playback position is moved to the video source packet indicated by the entry point map, when the source packet at the position is the first entry point of the clip to which the source packet belongs, the first source packet of the clip is played. An information storage medium that records an AV stream. At least one video source packet, at least one audio source packet, and at least one additional data source packet, wherein the additional data source packet includes an AV stream disposed after the video source packet having the same output time information. A reading unit to read out; A demultiplexer which demultiplexes the read AV stream into a video source packet, an audio source packet, and an additional data source packet; A video decoder for decoding and outputting the video source packet; And And an audio decoder for decoding and outputting the audio source packet. The method of claim 8, wherein the additional data source packet is A presentation graphic data containing subtitle information corresponding to a video, the output stream having a PTS as an output start time. The method of claim 8, wherein the additional data source packet is An interactive graphic data containing information relating to interaction with a menu or a user, and having a PTS as an output start time. The method of claim 8, The AV stream includes playback time information of a video source packet corresponding to an I picture among the video source packets, a packet number of a video source packet to be played corresponding to the playback time information, and a packet number of an additional data source packet. And an entry point map which is recorded. The method of claim 11, When the playback position is moved to the video source packet indicated by the entry point map, when the source packet at the position is the first entry point of the clip to which the source packet belongs, the first source packet of the clip is played. An AV stream reproducing apparatus. (a) at least one video source packet, at least one audio source packet and at least one additional data source packet, wherein the additional data source packet is disposed after the video source packet having the same output time information. Reading an AV stream; (b) demultiplexing the read AV stream into video source packets, audio source packets, and additional data source packets; And (c) decoding and outputting the video source packet and the audio source packet. The method of claim 13, The AV stream includes playback time information of a video source packet corresponding to an I picture among the video source packets, a packet number of a video source packet to be played corresponding to the playback time information, and a packet number of an additional data source packet. And a recording entry point map. The method of claim 14, When the playback position is moved to the video source packet indicated by the entry point map, when the source packet at the position is the first entry point of the clip to which the source packet belongs, the first source packet of the clip is played. AV stream playback method. (a) receiving a playback position change command; (b) In addition to the time information of the I picture in the video source packet and the entry point map recording the packet number of the additional data source packet in addition to the packet number of the I picture, the source packet number of the additional data is included. Determining whether it is in progress; And (c) if the additional data source packet number is included, moving the playback position to the packet number; otherwise, reproducing the AV stream by moving the playback position to the packet number of the I picture. How to play a stream.