JP4736918B2 - Digital playback device or playback program - Google Patents

Description

  The present invention is particularly useful when playing back a recording medium recorded by a digital recording apparatus that records information such as video and audio that is digitized and transmitted. The present invention relates to a digital playback apparatus that connects a plurality of series of video and audio bitstreams and continuously plays back when recording and playing back video signals in the H.264 format.

In recent years, several digital reproduction apparatuses that digitally record or reproduce digitized video signals and audio signals have been put to practical use or proposed (see, for example, Patent Document 1).
An example of the above-described conventional digital recording apparatus will be described below with reference to the drawings. FIG. 9 shows a block diagram of a conventional digital recording apparatus. In FIG. 9, 1 is a recording medium, 2 is a reproducing means, 3 is a control means, 4 is a system decoding means, 118 is a video signal changeover switch A, 6 is a video stream storage means, 119 is a video signal changeover switch B, 7 is a video decoder, 8 is a frame storage means, 9 is a video output terminal, 10 is an audio stream storage means, 11 is an audio decoder, and 12 is an audio output terminal.

  The operation of the digital playback apparatus configured as described above will be described below. On the recording medium 1, digital bit stream signals such as video and audio are recorded in a predetermined format. For example, the video signal is H.264. It is compressed in the H.264 format, and recording can be performed for a long time using the recording medium efficiently. The recorded digital bit stream signal is read from the recording medium by the reproducing means 2. The reproduction means 2 includes a laser pickup, a signal equalization circuit, an error correction circuit, and the like. The address of the recording medium is instructed from the control means 3, and the read digital signal is subjected to error correction processing and the like. Get stream signal. Next, the system decoding means 4 separates the video and audio digital bit stream signals.

  The separated video bitstream signal is input to the video decoder 7 through the video signal changeover switch A 118 and the video signal changeover switch B of the video stream storage means 6, 119. The video decoder 7 decodes and converts the video bitstream into a video signal while storing the decoded image in the frame storage means 8 and outputs it from the video output terminal 9.

  The audio bit stream separated by the system decoding unit 4 is input to the audio stream storage unit 10 and input to the audio decoder 11. In the audio decoder, the audio bit stream signal is decoded, and the decoded audio signal is output from the audio output terminal 12.

The recording medium 1 does not contain only one digital bit stream consisting of a series of video and audio signals. Therefore, two individual digital bit stream signals may be reproduced continuously. Furthermore, even within the same digital bit stream, the bit stream may be continuously reproduced in two different discontinuous sections. When such discontinuous connection points of digital bitstreams are connected and reproduced continuously, the first digital bitstream is first switched by switching the video signal selector switch 118 of the video stream storage means 6. One of them is sequentially stored. The video signal selector switch 119 transmits the first digital bit stream from the video stream storage means 6 to the video decoder and is decoded. The video signal changeover switch A 118 switches to the other video stream storage means 6 after the first digital bit stream is reproduced, and sequentially reproduces and stores the second digital bit stream. The video decoder 7 cooperates with the control means 3 and immediately after the decoding of the first digital bit stream is finished, the video decoder 7 switches the 119 video signal changeover switch B to start the decoding of the second digital bit stream. The second digital bit stream can be continuously decoded.
JP 2002-281458 A

  However, in the configuration as described above, the video stream storage means 6 must be provided twice as usual. Also, the video signal change-over switches A and B indicated by 118 and 119 are required, and further, the control means 3 must perform switch change-over control, with more hardware than usual and at the point of switching between the two streams. Complicated control of switching the switch is required. In addition, since a discontinuous stream is decoded at the switching point of the video bitstream, an error occurs in the decoded image and image disturbance may occur.

  In view of the above problems, the present invention performs continuous decoding across the connection points of two video bitstreams with a simple mechanism without the addition of video stream storage means or video signal changeover switches, and disturbs the playback screen. An object of the present invention is to provide a digital playback device that can be suppressed.

  In order to solve the above problems, the digital playback apparatus of the present invention includes a playback means for playing back a video or audio digital bitstream signal recorded on a recording medium, and the reproduced video or audio digital bitstream signal as a video bitstream. System decoding means for separating audio bitstreams, specific data inserting means for inserting specific data into the video bitstream, video stream storage means for temporarily storing the video bitstream, and video decoding means for decoding the video bitstream into a video signal Frame storage means for storing the decoded video frame signal, audio stream storage means for temporarily storing an audio bit stream, audio decoding means for decoding the audio bit stream into an audio signal, the playback means, and the system deco De means, said video decoding means, and a control means for controlling the audio decoding unit.

  In this digital playback device, when a plurality of video and audio bitstreams are connected and played back continuously, dummy data is inserted by the playback means at a playback signal connection point, and the inserted dummy data is inserted into the digital data. It is detected by the system decoding means, and specific data is inserted into the video bit stream. The video decoding means is configured to perform processing for detecting the specific data and suppressing the disturbance of the decoded image so as to connect smoothly. As a result, even when two bit streams are played back continuously, the playback image can be smoothly played back with less disturbance by adding less hardware and a simple decoding process. The video stream is H.264. When compressed in the H.264 format, the H.264 format particularly after straddling the connection point of the stream. By performing processing for a stream format peculiar to H.264, it is possible to reliably suppress disturbance of the reproduced image.

  The present invention provides an H.264 recording medium from a recording medium. When two bitstreams encoded in H.264 are connected and played back continuously, dummy data is inserted, dummy data is detected, and a specific NAL unit code is embedded in the stream for playback without disturbing the image. It is possible to perform. Further, it has an advantage that it can be easily realized without increasing hardware and performing complicated processing.

The first aspect of the present invention is read from the recording medium when a plurality of digital bit stream the video and audio are multiplexed to be reproduced to continue communicating a plurality of digital bit stream video and audio are multiplexed , Dummy data insertion means for inserting dummy data into connection points of a plurality of digital bit streams in which the video and audio are multiplexed, and the video and audio in which dummy data is inserted by the dummy data insertion means When separating a digital bit stream into a video digital bit stream and an audio digital bit stream, the dummy data is detected, and specific data for specifying a connection point is inserted into the video digital bit stream based on the detected dummy data a specific data insertion means for the digital video bit string Specific data detection means for detecting specific data in the video stream, and video decoding means for initializing decoding processing of the digital bitstream when the specific data is detected by the specific data detection means, The digital playback device has the effect of reliably transmitting the connection point of two connected bit streams to the video decoder by detecting the specific data by the video decoding means.

According to a second aspect of the present invention, the video digital bit stream signal recorded on the recording medium has the same configuration as that of the first aspect. The digital reproduction apparatus is characterized by being compressed in the H.264 format.

The third invention of the present invention has the same configuration as in the first or second aspect of the invention, and the data inserted by the specific data inserting means is H.264. The digital reproduction apparatus includes a start code of a NAL (Network Abstraction Layer) unit that is undefined in the H.264 standard or has an ID for future expansion.

A fourth invention of the present invention has the same configuration as that of any one of the first to third aspects, characterized in that the data inserted by the specific data inserting means includes a bit string “0” having a length of N bits. Digital playback device.

According to a fifth aspect of the present invention, there is provided a configuration similar to any one of the first to fourth aspects, and notifies the control means that the specific data inserted in the video bitstream has been detected. The digital playback apparatus is characterized in that the video bit stream is skipped until an SPS (Sequence Parameter Set) or IDR picture is detected, and then the connected stream is controlled to be decoded.

A sixth invention according to the present invention, when playing with continued communication a plurality of digital bit stream video and audio are multiplexed, the recording medium a plurality of digital bit stream the video and audio are multiplexed A dummy data insertion step of inserting dummy data into connection points of a plurality of digital bitstreams that have been multiplexed and the video and audio are multiplexed, and the video and audio into which dummy data has been inserted by the dummy data insertion are multiplexed When the digital bit stream is separated into a video digital bit stream and an audio digital bit stream, the dummy data is detected, and specific data for specifying a connection point in the video digital bit stream is detected based on the detected dummy data. a specific data insertion step of inserting, the video digital-bi A specific data detection step of detecting the specific data in the preparative stream, wherein when the specific data in a specific data detection step is detected, the program comprising: a video decoding step of initializing a decoding process of the digital bit stream is there.

According to a seventh aspect of the present invention, the video digital bit stream signal has the same configuration as that of the sixth aspect and the video digital bit stream signal is H.264. A feature and to Help program that 264 is in the form.

The eighth aspect of the present invention has the same configuration as that of any one of the sixth and seventh aspects, and the data inserted by the specific data insertion means is H.264. 264 is a feature and to Help program to include the start code of the NAL (Network Abstraction Layer) unit with an ID for standards on undefined or future expansion.

A ninth aspect of the present invention has the same configuration as any one of the sixth to eighth aspects, wherein the data inserted by the specific data inserting means includes a bit string “0” having a length of N bits. it is to Help program.

A tenth aspect of the present invention has the same configuration as any one of the sixth to ninth aspects, and notifies the control means that the specific data inserted in the video bitstream has been detected. after skipping the video bit stream until detecting an SPS (Sequence Parameter Set) or an IDR picture, which is characteristic and to Help program to control to decode the connected streams.

  Embodiment 1 of the present invention will be described below with reference to FIGS.

(Embodiment 1)
FIG. 1 shows a block diagram of the digital reproducing apparatus according to the first embodiment. In FIG. 1, 1 is a recording medium, 2 is a reproducing means, and includes dummy data inserting means. 3 is control means, 4 is system decoding means, 5 is specific data insertion means, 6 is video stream storage means, 7 is video decoder, 8 is frame storage means, 9 is a video output terminal, 10 is audio stream storage means, 11 Is an audio decoder, and 12 is an audio output terminal.

  The operation of the digital playback apparatus configured as described above will be described below. On the recording medium 1, digital bit stream signals such as video and audio are recorded in a predetermined format. For example, a fixed length (188 byte) packet such as a TS (Transport Stream) of MPEG2 (Moving Picture Image Coding Experts Group 2) is recorded. In MPEG2-TS, video and audio bit streams can be multiplexed and configured and transmitted. Furthermore, the video signal encoding method is not limited to the MPEG2 method, but also H.264. A stream structure is also possible which is compressed by an encoding method such as the H.264 method (also referred to as MPEG4-AVC) and can be recorded more efficiently.

  The digital bit stream signal recorded by the above method is first read from the recording medium 1 by the reproducing means 2. The reproduction means 2 includes a laser pickup, a signal equalization circuit, an error correction circuit, etc., and also includes a dummy data insertion means. The address of the recording medium is instructed from the control means 3, and error correction processing is performed on the read digital signal. After doing so, a reproduced digital bitstream signal is obtained. Next, the system decoding means 4 separates the video and audio digital bit stream signals. At this time, the specific data generated by the specific data insertion means 5 is inserted into the connection point of the video stream.

  The separated video bit stream signal is input to the video decoder 7 via the video stream storage means 6. The video decoder 7 decodes and converts the video bitstream into a video signal while storing the decoded image in the frame storage means 8 and outputs it from the video output terminal 9.

  The audio stream separated by the system decoding unit 4 is input to the audio stream storage unit 10 and input to the audio decoder 11. In the audio decoder, the audio bit stream signal is decoded, and the decoded audio signal is output from the audio output terminal 12.

The recording medium 1 does not contain only one series of video and audio digital bit stream signals. Accordingly, two or more bit stream signals may be connected and reproduced continuously. Furthermore, even within the same stream, bit streams in two different sections may be connected and reproduced continuously. When reproduction is performed across the connection points of the digital bit stream, the first digital bit stream is first reproduced from the recording medium by the reproduction means 2 and transferred to the system decoding means 4. The system decoding means 4 separates the audio and video streams and stores them in each video stream storage means 6 and audio stream storage means 10.
Next, in accordance with an instruction from the control means 3, dummy data is inserted by the dummy data insertion means in the reproduction means 2 and transferred to the system decoding means. For example, 188-byte dummy data that is the same as the packet length of MPEG2-TS is inserted. The system decoding means discriminates and detects the dummy data by a method such as packet ID or packet ID + ID described in the data.

  FIG. 2 shows a block diagram of the system decoding means 4. In FIG. 2, 13 is an input terminal, 14 is PID detection means, 15 is dummy data detection means, 16 is a TS / PES decoder, 17 is a changeover switch, 18 is a specific data input terminal, 19 is a changeover switch, and 20 is a video bit. A stream output terminal 21 is an audio bit stream output terminal. In MPEG2-TS, data is transmitted in fixed length (188 bytes) packets, and various packets are identified by PID (packet ID). It is possible to separate the streams by controlling the changeover switch 17 under the control of the control means 3 and comparing with the PID of the video bit stream and the PID of the audio bit stream. Further, by inserting a packet having a fixed PID by the reproducing unit 2 as dummy data, the PID detecting unit 14 and the dummy data detecting unit 15 can detect the dummy data. When dummy data cannot be identified and detected only by PID, it is possible to reliably detect a stream boundary by filling a predetermined fixed ID pattern in the data portion of the packet. For example, a NULL packet, which is normally used only for stuffing purposes, may be used as dummy data, and the PID of the NULL packet and a specific pattern subsequent thereto may be embedded as dummy data.

  The TS / PES decoder 16 removes the header for transmission called TS layer and PES (Packetized Elementary Stream) layer from the data sent in the MPEG2-TS packet, and ES (Elementary) stored in the TS / PES. Video and audio bit streams called “Stream” are extracted and output from the respective output terminals by the changeover switch 17.

  When dummy data is detected by the dummy data detection means 15, it indicates that the bit stream is discontinuous at the location where the packet is transmitted, and is a connection point where two bit streams are connected. Therefore, the specific data is inserted into the video bitstream by controlling the specific data insertion means 5 and the changeover switch 19.

  For example, if the video bitstream is H.264. When encoded in H.264, the ES layer is composed of a plurality of NAL units. In this NAL unit, a NAL header including an ID called nal_unit_type is added near the head depending on the type of data transmitted inside. Data to be transmitted includes various parameters of an image sequence and picture such as SPS and PPS (Picture Parameter Set), an IDR (Instantaneous Decoding Refresh) picture that is the first picture of the image sequence, and an access unit. It may be an AU (Access Unit) delimiter indicating a delimiter, End of Sequence data indicating the end of a sequence, or the like. Depending on the content of each data, H.264 defines a unique nal_unit_type value, and by detecting the ID in the NAL header, it is possible to determine the type of data being transmitted. The data generated and inserted by the specific data insertion means 5 at the stream connection point this time is H.264. The data format is defined by the NAL unit of the H.264 standard, and the value of nal_unit_type may be used for future expansion or undefined. Since these values are not currently used and do not exist in the video bitstream, it is possible to reliably detect connection points. The video decoder 7 can detect NAL unit data having an ID defined as the specific data, and can detect a connection point.

  FIG. The H.264 stream configuration will be briefly described. Unlike MPEG2, types such as I (Intra) slice, P (Predictive) slice, and B (Bi-Predictive) slice are defined as slice types in units of slices instead of pictures. FIG. 3 shows an example of a bit stream in which all slices in a picture are indicated by the same slice type. In such a case, the slice type is fixed in units of pictures such as an I picture, a B picture, and a P picture. In addition, there is a picture that is distinguished from an I picture, that is, the head picture of an image sequence called an IDR picture, and there is a picture that resets all states for decoding a video bitstream, such as the state of a reference picture buffer and parameters. 22 is an IDR picture, 23 is a B picture, and 24 is a P picture. Before the IDR picture, parameter information necessary for decoding sequence is transmitted as 25 SPS, and parameter information necessary for picture decoding is transmitted as PPS to 26 and 28. As shown in FIG. 29, an IDR picture to the next IDR picture correspond to MPEG2 GOP (Group of Pictures), and playback starts from the IDR picture at the head of the sequence when decoding is started.

Next, how the dummy data is inserted will be described with reference to FIG. In FIG. 4, only the MPEG2-TS video bit stream is shown for simplicity. Reference numeral 30 denotes a video bit stream 1 and reference numeral 35 denotes a video bit stream 2 which are connected and reproduced. Reference numerals 31, 33, 34, 37, and 38 indicate B picture data in the video bit stream, 32 and 39 indicate P picture data, and 36 indicates IDR picture data. It is assumed that the video bitstream 1 ends with B picture data composed of MPEG2-TS 40 to 41, and the video bitstream 2 starts with 43 TS data. When these bit streams 1 and 2 are connected and reproduced continuously, dummy data is inserted in the reproducing means 2 as shown at 42.
For example, 34 B pictures are transmitted as 45 ES headers, 47 PPSs following 46 PES headers, and video ES data after the B picture headers. However, since the data transmission unit is 188 bytes, the ES data of the next picture may start in the final TS packet 41 as indicated by 48. Similarly, the head IDR picture data 36 of the video bitstream 2 is transmitted as MPEG-TS data 43 to 44, but is transmitted as 50 to SPS, PPS, IDR picture header, and picture data. However, as shown in 49, the first TS packet may contain the remnants of the previous picture data. If these bit streams 1 and 2 are simply connected, unnecessary ES data 48 and 49 are erroneously connected and sent to the video decoder to cause a decoding error.

  In particular, FIG. 5 shows the state of the connection points. In FIG. 5, 53 is SPS, 54 is PPS, 55 is a picture header, and 56 is picture data. Reference numeral 57 denotes data of the video bit stream 2. Reference numerals 58, 59, 60, 61, 66, 67, and 68 are variable length codes VLC (Variable Length Codes) that are encoded video data. At the connection points connected as shown in FIG. Data and data in which a stream is cut off in the middle of VLC, such as 62 and 65, can cause a decoding error in the video decoder.

Therefore, the system decoding means 4 and the specific data insertion means 5 that have detected the dummy data insert NAL unit data having a specific ID and '0' data, as indicated by 63 and 64. Assuming that NAL units are inserted at seamless playback points, 63 is a SLESS_NAL unit. The “0” data shown in 64 plays a role of quickly pushing out the data of the video bitstream 1 in a buffer in the decoder, for example, so that the data arrives at the decoder early.
At the stream attachment point, the decoder will be able to detect 63 SLESS_NAL units. Therefore, when the SLESS_NAL unit is detected at the stream connection point, the data of the bit stream 2 may be decoded without displaying a picture not completed in the bit stream 1.
At this time, H.C. In H.264 data, even if it is an I picture, the video bitstream 2 cannot be decoded unless the IDR picture is searched and decoding is started from the SPS. Therefore, when the decoder detects the SLESS_NAL unit, the IDR picture is searched. Therefore, the control means 3 needs to control the video decoder 7 so as to start decoding.

The image output at the start of decoding will be described with reference to FIG. In FIG. 6, a picture sequence continuing from 69 P pictures indicates the display picture order of the original image data. 70 and 77 are IDR pictures, 71, 72 and 76 are B pictures, 73 and 75 are P pictures, and 74 are I pictures. In addition, 70 and 77 IDR pictures are decoding start points. H. In H.264, for example, 73 P pictures, such as 79, are encoded with reference to 70 IDR pictures. Further, as shown in 80, it is possible to refer to and encode beyond the I picture 74. However, the IDR picture is not referenced beyond 78.
Now, it is assumed that the position information of the I / IDR picture is recorded as 81 or 82 on the storage medium 1 and can be reproduced from the head of the IDR / I pictures of 70 and 74, respectively. . In this case, as shown in the lower part of FIG. 6, even if an attempt is made to reproduce from an I picture, reproduction is not possible because there is no reference image as in 83. Therefore, H.H. In H.264, reproduction is started from the IDR picture.

  In the bitstream 2 of FIG. 4, if 36 is transferred from the I picture as shown by 74 in FIG. 6, the video decoder 7 skips the video bitstream data up to 77 IDR pictures and plays back from the SPS / PPS. Need to start.

  In this way, since the decoder can detect the connection point reliably by detecting the SLESS_NAL unit at the connection point of the bit stream, when the bit stream 1 and the bit stream 2 are continuously reproduced, H. By correctly decoding according to the characteristics of the H.264 encoding method, it is possible to suppress image disturbance. The control means 3 controls the decoding operation of these decoders.

  Note that IDR special playback (fast-forward playback) in which data of only one picture, for example, only IDR pictures are connected in order and played back before and after connecting the streams may be used.

  Further, by inserting dummy data at the stream connection point, the connection point is transmitted to the system decoding means 4. For example, after reproducing the bit stream 1 without using the dummy data, the reproduction means 2 controls the control means 3. It is also possible to send a reproduction completion interrupt notification to the control unit 3 and to control the system decoding unit 4 to insert a specific code such as a SLESS_NAL unit into the video ES and to reproduce the bitstream 2 thereafter.

(Embodiment 2)
The second embodiment performs almost the same operation as that of the first embodiment, and the reproduction method as shown in the flowcharts of FIGS. 7 and 8 is implemented as a program operable on a computer.

  Detailed description will be given with reference to FIGS. Similar to the first embodiment, the operation of the reproducing means shown in the flowcharts 101 to 105 will be described. 101 is a reproduction start, and reproduction of the first stream is started. In step 102, the reproduction process of the n-th stream (n = 1 at the start) is performed. In 103, it is determined whether or not the next stream reproduction is to be performed continuously. When the next stream is not reproduced, the process proceeds to 104 and the reproduction is finished. Next, when performing stream reproduction continuously, 105 dummy data insertion processing is performed. Thereafter, the value of n + 1 is entered in n, and the process returns to 102, and the (n + 1) th stream reproduction process is sequentially performed.

  106 to 110 show flowcharts of the system decoding means. As in the first embodiment, after the reproduction of 106 is started, it is determined in 107 whether or not it is dummy data based on the packet ID. If it is not dummy data, video / audio packet separation processing is performed at 108. Next, the process of converting the MPEG2-TS into an ES is performed at 109 and the process returns to 107. If dummy data is detected at 107, the SLESS_NAL unit and “0” data are inserted into the video ES at 110, and the process returns to 107.

FIG. 8 shows a flowchart of the video decoder from 111 to 117. Playback is started at 111 and SPS detection processing is performed at 112. If an SPS is found, the header decoding process 113 performs SPS / PPS and header decoding processing for each picture. Next, in 114, it is confirmed whether or not a SLESS_NAL unit is detected. If a SLESS_NAL unit is detected, the process returns to 112.
In step 115, picture decoding is performed. 116 is the same as 114. Finally, an image output process is performed at 117, and the decoded image data is output.

  As described above, the second embodiment is implemented as a program operable on a computer in accordance with the processing similar to the first embodiment according to the processing shown in the flowcharts of FIGS.

  In the second embodiment, the program is implemented as a program operable on a computer. However, similar to a computer, the program is implemented by any signal processing circuit, microcode, or electronic device that operates a language described as a program. However, it does not matter as long as an equivalent process can be realized.

  In the first and second embodiments, the video bitstream encoding method is described in H.264. Although the H.264 system has been described, similarly in other encoding systems, data for the future and undefined in the format of each encoding system can be used as specific data, and two streams can be continuously reproduced. good.

1 is a block diagram of a digital playback apparatus according to Embodiment 1 of the present invention. 1 is a block diagram of system decoding means of a digital playback device according to Embodiment 1 of the present invention. The H.264 according to Embodiment 1 or 2 of the present invention. The figure which showed the structure of the video digital bit stream encoded by H.264 The figure which showed insertion of two digital bit streams and dummy data by Embodiment 1 of this invention Explanatory drawing of the stream connection point by Embodiment 1 or 2 of this invention The H.264 according to Embodiment 1 or 2 of the present invention. Explanatory drawing of the inter-frame reference method encoded by H.264 Flowchart of reproducing means and system decoding means according to Embodiment 2 of the present invention Flowchart of video decoder according to embodiment 2 of the present invention Block diagram of a conventional embodiment of a digital playback device

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Recording medium 2 Reproducing means 3 Control means 4 System decoding means 5 Specific data insertion means 6 Video stream memory means 7 Video decoder 8 Frame memory means 9 Video output terminal 10 Audio stream memory means 11 Audio decoder 12 Audio output terminal 13 Input terminal 14 PID detection means 15 Dummy data detection means 16 TS / PES decoder 17, 19 changeover switch 18 input terminal 20 video bitstream output terminal 21 audio bitstream output terminal 22 IDR picture data 24 P picture data 23 B picture data 25 SPS
26, 28 PPS
27 IDR picture data 29 Decoding sequence 30 Video digital bit stream 1
35 Video Digital Bitstream 2
32, 39 P picture data 31, 33, 34, 37, 38 B picture data 40, 41, 43, 44 MPEG2-TS packet data 45, 51 TS header 46, 52 PES header 47 PPS / B picture header 48, 50 SPS / PPS, IDR picture header 49 B picture data 53 SPS
54 PPS
55 Picture header 56 Slice header, macroblock data 57 B picture data 58, 59, 60, 61, 66, 67, 68 VLC data 62, 65 Missing VLC data 63 SLESS_NAL unit data 64 “0” data 69, 73, 75 P picture data 70, 77 IDR picture data 71, 72, 76 B picture data 74 I picture data 78, 79, 80, 83 Arrows indicating reference relationship 81, 82 IDR / I picture position information 118 Changeover switch A
119 changeover switch B

Claims (10)

When a plurality of digital bitstreams in which video and audio are multiplexed are continuously played back, the plurality of digital bitstreams in which the video and audio are multiplexed are read from the recording medium, and the video and audio are multiplexed. Dummy data insertion means for inserting dummy data at connection points of a plurality of digital bitstreams;
When the digital bit stream multiplexed with video and audio into which dummy data is inserted by the dummy data insertion means is separated into a video digital bit stream and an audio digital bit stream, the dummy data is detected and detected. Specific data insertion means for inserting specific data for specifying a connection point in the video digital bitstream based on the dummy data,
Specific data detection means for detecting specific data in the video digital bitstream;
Video decoding means for decoding the video digital bitstream;
When the specific data is detected by the specific data detection unit, the video decoding unit is set so as to skip the video digital bit stream until the start of the first sequence data in the video digital bit stream after the specific data is detected. Control means for controlling;
A digital playback device comprising: The video digital bit stream signal is H.264. H.264 format,
The digital playback apparatus according to claim 1. The specific data inserted into the video digital bitstream by the specific data insertion means is H.264. It includes a start code of a NAL (Network Abstraction Layer) unit that is undefined in the H.264 standard or has an ID for future expansion.
Digital reproducing apparatus according to any one of claims 1 or 2. The specific data inserted into the video digital bitstream by the specific data insertion means includes a bit string “0” having a length of N bits,
The digital reproduction apparatus according to any one of claims 1 to 3. The data at the head of the sequence is an SPS (Sequence Parameter Set) or IDR (Instantaneous Decoding Refresh) picture.
The digital reproduction apparatus according to any one of claims 1 to 4. On the computer,
When a plurality of digital bitstreams in which video and audio are multiplexed are continuously played back, the plurality of digital bitstreams in which the video and audio are multiplexed are read from the recording medium, and the video and audio are multiplexed. A dummy data insertion step of inserting dummy data at connection points of a plurality of digital bitstreams;
When the digital bit stream in which the video and audio into which the dummy data is inserted by the dummy data insertion is multiplexed is separated into the video digital bit stream and the audio digital bit stream, the dummy data is detected and detected. A specific data insertion step of inserting specific data for specifying a connection point in the video digital bitstream based on dummy data;
A specific data detection step of detecting specific data in the video digital bitstream;
A video decoding step of skipping and decoding the video digital bitstream until the first sequence head data is detected in the video digital bitstream after the specific data when the specific data is detected by the specific data detection means; When,
A program for running The video digital bit stream signal is H.264. H.264 format,
The program according to claim 6. The data inserted into the video digital bitstream by the specific data insertion step is H.264. It includes a start code of a NAL unit that is undefined in the H.264 standard or has an ID for future expansion.
The program as described in any one of Claim 6 or 7. The data inserted by the specific data insertion step includes a bit string “0” having a length of N bits.
The program according to any one of claims 6 to 8. The data at the top of the sequence is an SPS or IDR picture.
The program according to any one of claims 6 to 9.