JP2008236163A - Reproducing device, and video recording and reproducing device and special reproduction method thereof - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To enable smooth special reproduction utilizing an I picture even in a device having low throughput to streams of all programs included in a program even if only the stream of one program in programs has I picture position information in the multi-view broadcasting of digital broadcasting conforming to an MPEG standard. <P>SOLUTION: When the special reproduction of an AV stream of the multi-view broadcasting is performed, the control section of a video recording and reproducing device refers to the I picture information of the main stream of the program, refers to the position information of an I picture required for the special reproduction and the next I picture, and reads the stream of a program between them. The stream of a program to be reproduced from the stream is separated and extracted for taking out the I picture, and the special reproduction of the program to be reproduced by the I picture is performed. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The technical field relates to a video playback apparatus and playback method for playing back recorded video.

  In recent years, in the field of television broadcasting, there has been an attempt to shift from conventional analog broadcasting to digital broadcasting.

  Patent Document 1 discloses an “information recording apparatus and the like that can record broadcast information so that broadcast information to be reproduced can be accurately identified and reproduced while improving the convenience of reproducing broadcast information. As a means for solving this problem, “when reproducing in allocation unit ALU units according to the reception time of the first packet and the reception time of the last packet of the allocation unit ALU including a plurality of packets included in the broadcast information. Is also managed in units of access units including the I picture based on the display time information of the I picture included in the packet or the reception time information thereof ”. .

  Patent Document 2 states that “position information of an I picture is inserted into a transport stream according to a predetermined rule during recording of the transport stream, and position information of the I picture is quickly read out according to the rules during special playback. Detecting I picture based on the above and making it possible to easily perform special reproduction ", and as a means for solving the problem," When recording a transport stream on a recording medium, the MPEG picture type is analyzed to analyze the I picture. The position information is acquired, and the position information of the acquired front I picture is described in the form of a transport stream packet to be an I reference packet, and the I reference packet is periodically (for every fixed number of packets) Is inserted and recorded, and during special playback, the inserted I reference packet is acquired, Special playback extracted transport stream packet of the I-picture based on the re "that have been described.

  Non-Patent Document 1 discloses “multi-view” as a technology that “broadcasts the content of a program into a maximum of three with standard television image quality and can be applied to sports, theater broadcasts, dramas, and the like”.

JP 2003-257157 A JP 2005-197839 A nhk / digital Features of BS digital broadcasting Multi-broadcast, [online], [Search on February 1, 2007], Internet <URL: http://www.nhk.or.jp/digital/bs/guide/multi/ >

  In digital broadcasting, an image compression technique for compressing and transmitting image data can be used, and MPEG technology is widely used as a de facto standard for digital broadcast image compression techniques.

  In digital television broadcasting employing MPEG technology, time-division multiplexing is performed using a relatively short transmission unit (transport packet), and transmitted as MPEG2-TS (transport stream) from a broadcasting station to a receiver.

  In the MPEG2 standard, video and audio data (AV data) is encoded (encoded), and the encoded data is transmitted as MPEG2-TS composed of a plurality of transport packets.

  The MPEG2-TS received by the receiver is decoded (decoded) by the decoder and output as AV data to the display screen / audio output device.

  The received MPEG2-TS is temporarily stored in a storage medium using a disk such as an HDD (hard disk drive), an optical disk, a magneto-optical disk, or a magnetic disk, or in a card-shaped storage medium using a semiconductor. It can also be recorded on a recording device / media such as, and can be played back and viewed at the viewer's request by the operation of the viewer. At this time, the user can perform special playback such as fast-forward playback, rewind playback, and jump playback during playback. For example, Patent Document 1 discloses a technique such as a method for recording MPEG2-TS on a recording device / media.

  By the way, in MPEG2, when encoding an image, not only the image data of all frames is directly encoded, but also the data of neighboring frames that have already been encoded are referred to and only the difference from the data is encoded. It has a function. In general, since a moving image has a high correlation between neighboring frames, it is expected that the amount of information after coding can be significantly reduced by coding only the difference from neighboring frames.

  According to the MPEG standard, frames (pictures) are classified into three picture types: I (Intra) pictures, P (Predictive) pictures, and B (Bidirectionally predictive) pictures.

  An I picture is a frame (picture) that is encoded in a GOP (Group of Pictures) while maintaining independence and without referring to data of other frames (pictures). On the other hand, a P picture is a frame (picture) that is encoded with reference to a past I picture or P picture, and a B picture is encoded with reference to past and future I pictures or P pictures. Frame (picture). The encoding efficiency increases in the order of I, P, and B, and the I picture has the lowest encoding efficiency. However, the I picture has a feature that an image can be restored with only one frame (picture).

  Therefore, when special playback such as fast-forwarding is performed, only the I picture is extracted and the image is restored. Patent Document 2 below discloses a method for special reproduction of a transport stream by storing position information of an I picture in a recording medium such as an HDD and reading it.

  Furthermore, digital broadcasting is encouraging that various advanced services can be provided to users. One of them is multi-view broadcasting, and Non-Patent Document 1 gives an example in which various hole conditions can be switched and enjoyed in a golf program as an example of multi-view broadcasting.

Here, an example of a data structure when storing in a recording medium of AV stream contents such as video data and audio data will be described with reference to FIGS.
FIG. 5 is a schematic diagram illustrating an example of a TTS packet.
FIG. 6 is a schematic diagram illustrating an example of a relationship between a TTS packet and an AU (Allocation Unit) in an AV stream stored in a recording medium.
FIG. 7 is a schematic diagram showing an example of the relationship between the AU and I pictures of the AV stream stored in the recording medium and the accompanying information.

  As shown in FIG. 5, a transport packet (TS packet) having a length of 188 bytes in the MPEG standard has time information of 4 bytes at the head (for example, the time when the receiver receives the transport packet) (hereinafter, , ATS: described as Arrival Time Stamp), and is recorded on a recording medium such as an HDD as a TTS (Time Stamped Transport Stream packet) packet having a length of 192 bytes. The time information ATS holds time stamp information when the transport packet arrives. The MPEG standard TS packet is composed of a header of the first 4 bytes, followed by a payload of 184 bytes (or an adaptation field). A packet ID (PID) is stored in the header, and each packet is identified. In addition, as an MPEG standard, a program map table (PMT) for associating a PID with a program is provided, which can be used for video or audio, or when a program provider identifies a stream.

  As shown in FIG. 6, for example, 8192 TTS packets are collected to form an AU (Allocation Unit). In this case, the size of each AU is about 1.5 Mbytes.

  The TTS packet in the AU includes a TTS packet including the I picture in the payload of the transport packet.

  SI (Stream Information) is information for managing the search / access unit at the time of reproduction of the AV stream recorded on the recording medium in the AU unit, and is recorded as a file separate from the AU, such as an I picture and a GOP. Information about the position is recorded in the SI.

  On the other hand, a file for recording AU management information is AUI (Allocation Unit Information). In the AUI, the time when the first TTS packet of the AU arrives (for example, the time when the receiver receives the transport packet) is recorded as time stamp information.

  The above prior art describes a method of storing I picture position information in a recording medium in advance and using it for special reproduction of MPEG2-TS. That is, the SI file in the above description is created, and the special reproduction of MPEG2-TS is realized by using the SI file.

  However, the above prior art does not disclose a method for special reproduction of recorded data of a program including a program corresponding to the above-described multi-view broadcasting.

  On the other hand, there is a movement to establish a digital recording standard corresponding to removable media. At present, such standards also have I picture position information corresponding to the above SI, but only one I picture position information related to one program is included in one program. Therefore, in such a case, in the main program stream of multi-view broadcasting, even if special reproduction can be performed based on I-picture position information, the sub-program stream does not have I-picture position information. There was a problem that smooth special reproduction could not be performed.

  Further, in the digital recording standard corresponding to such a removable medium, it is not essential to have I picture position information, but it is treated as an option. This is a problem especially when recording data of a multi-view broadcast is exchanged between different manufacturers on a removable medium or the like.

  According to an embodiment of the present invention, in the reproduction of content including a plurality of programs, the second program is reproduced based on information included in the first program. Specifically, when only one program stream has the position information of the I picture in multi-view broadcasting, the position information of the I picture is used to read a plurality of program streams, and then play them back. The program stream to be reproduced is separated and extracted, the I picture of the program to be reproduced is extracted by the decoding unit, and the reproduced program stream is specially reproduced by the I picture.

  In addition, when there is no I picture position information in multi-view broadcasting, the time stamp information added to the head of one block of the TTS corresponding to the above AU is used to reproduce the stream of the reproduced program. Perform special playback.

  According to the above means, it is possible to perform smooth special reproduction of recorded video. In particular, smooth special reproduction can be performed even in digital broadcast multi-view broadcasting. Issues, means, and effects other than those described above will also be described in the description of embodiments described later.

  Hereinafter, each embodiment according to the present invention will be described with reference to FIGS. 1 to 4.

Embodiment 1
Hereinafter, a first embodiment according to the present invention will be described with reference to FIGS. 1 to 3.

First, the configuration of the video recording / reproducing apparatus according to the first embodiment will be described with reference to FIG.
FIG. 1 is a block diagram showing an example of the configuration of the video recording / playback apparatus according to the first embodiment.

  The video recording / playback apparatus according to the present embodiment is a video recording / playback apparatus that receives a digital broadcast and performs recording and playback. As an example of the image compression technique, a case will be described in which a signal encoded and multiplexed by the MPEG (Moving Picture Experts Group) method is handled.

  In this configuration example, each is described as a hardware element, but a part may be realized by software. Further, the present invention may be applied to transmitting video content, audio content, and the like to a specific user such as VOD (Video On Demand). These are collectively called distribution.

  The video recording / reproducing apparatus of the present embodiment shown in FIG. 1 includes a recording / reproducing unit 10, a control unit 114 (for example, a CPU (Central Processing Unit)), and a user interface unit 115 (for example, a keyboard, a mouse, or a remote controller as an input device). Etc.).

  The control unit 114 is connected to each unit (including the recording / reproducing unit 10) of the video recording / reproducing apparatus via a bus unit, and controls the operation of the entire video recording / reproducing apparatus. In addition, various processing signals are received by receiving various command signals from the user via the remote control of the user interface unit 115 and controlling each unit connected via the bus unit based on the command signals.

  The recording / reproducing unit 10 includes a tuner decoding unit 101, a selector 102, a separation / extraction unit 103 (for example, a demultiplexer), an input buffer 104, a decoding unit 105 (for example, an MPEG decoder), a network interface unit 106, a buffer management unit 107, Clock reproduction unit 108, time stamp comparison / output unit 109, time stamp addition unit 110, reading unit 111, writing unit 112, recording medium 113, output unit 116, fixed clock generation unit 117 (for example, crystal oscillator), control information generation Unit 201 and read control unit 202.

  Here, the recording medium 113 is a medium that can be randomly accessed, such as a hard disk, a semiconductor memory, an optical disk, a magneto-optical disk, and a magnetic disk. The recording medium 113 may be a detachable removable recording medium. The output unit 116 is a display unit using a CRT (Cathode Ray Tube), LCD (Liquid Crystal Display), PDP (Plasma Display Panel) or the like, an audio output unit using a speaker or the like, or other display devices, etc. An output terminal for outputting data.

  In addition, it is assumed that no contact is made with respect to a place where lines representing flows of information, PCR, and the like intersect. However, the portion marked with a black circle is in contact and indicates that it has branched from there.

  The tuner decoding unit 101 receives a digital broadcast signal from a broadcast station via a broadcast transmission network such as a satellite, the ground, and a cable. Channel selection and detection processing are performed on the frequency of a physical or virtual channel designated via a user operation unit such as a remote controller of the user interface unit 115 and the control unit 114. Further, the MPEG2-TS (transport stream) after digital demodulation and error correction processing is output to the selector 102.

  The selector 102 performs a 3-input 1-output selection process in accordance with control from the control unit 114, and outputs the output to the separation / extraction unit 103.

  The separation / extraction unit 103 separates / extracts the transport packet of the channel (program) designated via the user operation unit such as a remote controller of the user interface unit 115 and the control unit 114 from the input MPEG2-TS, The separated / extracted transport packet is output to time stamp adding section 110. Also, the separation / extraction unit 103 is a video and audio PES (Packetized Elementary Stream) from a transport packet of a channel (program) designated via a user operation unit such as a remote controller of the user interface unit 115 and the control unit 114. Alternatively, ES (Elementary Stream) is separated and extracted and output to the input buffer 104.

  Here, ES refers to each of compressed and encoded image / sound data, and PES refers to a packet obtained by dividing the image ES or sound ES into appropriate sizes. Further, the separation / extraction unit 103 extracts a PCR (Program Clock Reference) from a transport packet of a channel (program) designated via the user operation unit such as a remote controller of the user interface unit 115 and the control unit 114, The data is output to the clock reproduction unit 108.

  Further, when one program is composed of a plurality of programs in multi-view broadcasting, the separating / extracting unit 103 uses a channel (specified via the user operation unit such as a remote controller of the user interface unit 115 and the control unit 114). The video and audio PES or ES for each program is separated and extracted from the transport packet of the program and output to the input buffer 104.

  Note that multi-view broadcasting is a broadcasting system in which, for example, a plurality of videos / audios can be played in a service and switching can be performed in units of video / audio combinations intended by a broadcasting station. There is a difference between one video / audio combination as a main service and the other as a sub service. The PID of the main service is PMT (abbreviation of Program Map Table as a default ES. Each PID (packet identifier, such as an image or sound included in a program), for indicating what each transport packet is transmitting. Stuff.) Is stored. The relationship between main and sub is specified by component_group_descripter in EIT (Event Information Table). In addition, it is presented from the main channel when receiving.

  The input buffer 104 temporarily stores the video / audio PES or ES from the separation / extraction unit 103. The decoding unit 105 compares the DTS (Decoding Time Stamp) / PTS (Presentation Time Stamp) corresponding to the PES or ES stored in the input buffer 104 with the STC (System Time Clock) count value from the clock reproduction unit 108. By taking the decoding / display timing, the video / audio PES or ES stored in the input buffer 104 is extracted and decoded, and the decoded video / audio is output to the output unit 116.

  The output unit 116 reproduces the decoded video / audio on the display unit / audio output unit which is an output device. Alternatively, video / audio content data or the like is output to another display device or the like via an output terminal (for example, HDMI (High-Definition Multimedia Interface)).

  The clock recovery unit 108 uses PCR to reproduce, for example, the system clock of the receiver whose frequency matches the system clock of the encoding / multiplexing unit on the broadcasting station side. The reproduced system clock is output to the STC counter in the clock recovery unit 108, the time stamp addition unit 110, and the like. In addition, the STC count value of the STC counter that operates based on the reproduced system clock is output to the decoding unit 105.

  The time stamp adding unit 110 generates a time stamp by a counter that operates based on, for example, a system clock reproduced by the clock recovery unit 108 or a crystal oscillator (not shown), and is separated and extracted by the separation / extraction unit 103. A time stamp (ATS in FIG. 5) is added to each transport packet and output to the writing unit 112.

  The writing unit 112 performs a process of recording the transport packet to which the time stamp is added by the time stamp adding unit 110 on the recording medium 113. As a result, one stream having a transport packet to which a plurality of time stamps including video / audio data of a certain channel (in other words, a certain program content and downloaded content) is added is one The data file or two or more fragment data files obtained by dividing the data file is stored in the recording medium 113.

  The time stamp can also be said to be time information related to the temporal position of the transport packet to which the stamp is attached. For example, the time when the transport packet from the separation / extraction unit 103 is input to the time stamp adding unit 110, or a certain transport packet (for example, the immediately preceding or first transport packet) It can also be said that this is a time difference. As described above, this time stamp is different from a time stamp (for example, PCR, DTS, or PTS) included in advance in the transport packet.

  The buffer management unit 107 monitors the amount of unprocessed transport packets by the decoding unit 105 in the input buffer 104, and controls the reading start and stop of the reading unit 111 according to the amount.

  The reading unit 111 is controlled via the buffer management unit 107 or the control unit 114, and sequentially reads transport packets added with a plurality of time stamps included in the stream from the recording medium 113, and compares and outputs the time stamps. Output to the unit 109 and the read control unit 202.

  The time stamp comparison / output unit 109 includes a counter value of a counter that operates based on a fixed clock recovery unit 117 such as a crystal oscillator, and a time stamp of a transport packet to which the time stamp read by the reading unit 111 is added. If they match, the time stamp is deleted (removed) from the transport packet and output to the selector 102 and the network interface unit 106. As described above, when the remaining amount of the input buffer 104 is monitored by the buffer management unit 107 and the reading unit 111 is controlled according to the amount, the transport is performed without comparing the counter value with the time stamp. The time stamp may be deleted from the packet and output to the selector 102 and the network interface unit 106. In particular, it is preferable to output by this method at the time of reproduction other than normal reproduction (single speed reproduction).

  The network interface unit 106 is connected to another device (recorder, display, server, or the like) that is an output destination / input source via a line (IEEE1394 cable, LAN cable, wireless, or the like). The time stamp comparison / output unit 109 receives a transport packet such as video / audio from which the time stamp has been deleted, and converts the transport packet into a format according to each transmission standard via a line. Output to another device that is the output destination. Also, data such as video / audio is input from another device as an input source via a line in a format according to each transmission standard, converted into a transport packet, and output to the selector 102. There may be a plurality of network interface units 106.

  The control information creation unit 201 is a part that creates AUI and SI control information for the AV stream.

Next, a special playback process of the video recording / playback apparatus according to the first embodiment will be described with reference to FIGS. In this figure, only video ESs are extracted from the multi-view broadcast transport stream and arranged in order of time.
FIG. 2 is a diagram illustrating an example of an AV stream of multi-view broadcasting according to the first embodiment. In this figure, only video ESs are extracted from the multi-view broadcast transport stream and arranged in order of time.
FIG. 3 is a flowchart showing a procedure of special playback processing for multi-view broadcasting according to the first embodiment.

  In the present embodiment, an AV stream (VES: Video Elementary Stream) of multi-view broadcasting as shown in FIG. 2 is considered. In this AV stream, one program stream is composed of streams of programs A (VESA), B (VESB), and C (VESC), and A is a main stream and I-picture position information is recorded in SI. To do. In the figure, the position information of the leading I picture of the VESA # i-th stream is SI # i.

  For example, consider a case where the substream program B is reproduced (searched) from the VESB # i-th position.

  The control unit 114 shown in FIG. 1 gives an instruction to the recording / reproducing unit 10 to reproduce the stream B of the program to be reproduced in the read stream.

  The separation / extraction unit 103 of the recording / reproducing unit 10 separates / extracts only B of the stream of the program to be reproduced (S100).

  At the same time, the decoding unit 105 of the recording / reproducing unit 10 gives an instruction to decode only one I picture and operate in the I picture dedicated mode notifying the end of decoding by means such as an interrupt (S101).

  The control unit 114 illustrated in FIG. 1 instructs the read control unit 202 to read SI # i and SI # (i + 1) necessary for special reproduction from the management information (S101).

  Next, the control unit 114 gives the read control unit 202 the VESA # i-th SI # i and VESA # (i + 1) th SI # (i + 1) necessary for special playback from the management information. An instruction is given to read (S103).

  Next, the control unit 114 instructs the read control unit 202 to read a stream between SI # i and SI # (i + 1) (S104).

  Then, it receives a report that one I picture has been output from the decoding unit 105 of the recording / reproducing unit 10 by means such as an interrupt (S105), and then the control unit 114 performs the VESA # i-th necessary for special reproduction. The position information of the stream is searched, and such an operation is repeated until the end of the AV stream of one program or the end of special playback (S102). The value of i is updated to a value corresponding to the double speed of the reproduction speed every time the loop process from S105 to S100 is performed.

  For example, double-speed fast-forward playback may be performed by extracting streams such as SI # 0 and SI # 1, SI # 2 and SI # 3, SI # 4 and SI # 5, and so on. In this case, the time interval for updating and displaying the I picture is the same as the time interval for updating and displaying the I picture for normal playback (single speed playback).

  Also, it can be easily understood that the rewind playback can be realized by taking out the stream in the negative direction.

  Further, although the present embodiment has been described assuming digital TV broadcasting using broadcast waves, the present invention can also be applied to Internet TV using a network such as the Internet and data acquired by downloading content.

  In this embodiment, MPEG is used as an example of an image compression technique. The present invention can also be applied to an image compression technique such as H.264. In this case, the I picture in the above description may be processed as an IDR (Instantaneous Decoder Refresh) picture (frame).

[Embodiment 2]
Next, a special playback process of the video recording / playback apparatus according to the second embodiment will be described with reference to FIG.
FIG. 4 is a diagram showing the relationship between time stamps described in AU and AUI.

  The first embodiment is a case where special reproduction of the substream program is performed when only the position information of the I picture of the mainstream program is recorded in the SI.

  In the present embodiment, special reproduction is performed when position information of an I picture is not recorded in SI or SI information itself does not exist.

  As already described, time stamp information is added to the head of each AU in which the first TTS packet of the AU is recorded as time stamp information in the AUI. As shown in FIG. 7, it is assumed that the time stamp of AU # i is time stamp #i.

  As shown in FIG. 4, for example, time stamp # 3 = t seconds and time stamp # 4 = t + 5 seconds. Therefore, the time converted during normal reproduction of AU # 3 is 5 seconds.

  As a video playback unit, GOP is defined as an MPEG standard, and this period in digital broadcasting is about 0.5 seconds, and at least one I picture must be included in one GOP. It is stipulated to include.

  Here, consider a case where the program of the program to be reproduced is composed of A, B, and C, and the special reproduction of the B program stream is performed.

  Since the playback time of AU # 3 is 5 seconds as described above, there are about 10 GOPs. Therefore, there are 10 or more I pictures. A GOP normally contains 15 pictures, and the time for reproducing one I picture is about 0.5 seconds / 15 = 1/30 seconds. Accordingly, since there are about 10 I pictures in program B in AU # 3, 1/30 seconds × 10 = 1/3 seconds are required to reproduce all I pictures in AU # 3.

  For example, when the program B stream in AU # 3 is to be fast-forwarded and reproduced at double speed, the control unit 114 instructs the decoding unit 105 to perform an I-picture-dedicated operation. 3 is output (all displayed in 1/3 second), and when 2.5 seconds have elapsed from the start of playback, the recording / playback unit is instructed to start playback of the next AU # 4. .

  That is, when the stream of program B in AU # i is to be fast-forwarded and reproduced at n times speed, the I picture in program B is displayed within the reproduction time indicated by the following (formula 1) of AU # i. It may be adjusted as follows.

(Time stamp # (i + 1) −Time stamp #i) / n (Expression 1)
However, when fast-forwarding is performed at 60 × speed when time stamp # (i + 1) −time stamp # i = 5 as in the case of AU # 3 in the above example, the result of (Expression 1) is 1/12 seconds. It becomes. In this case, since it is impossible to display all 10 I-pictures existing in AU # 3 during this period, for example, if the number (2) that can be displayed within 1/12 seconds is displayed. Good. At this time, by displaying the first I picture and the sixth I picture of the ten, it is possible to display them at equal intervals (smooth).
Also in the above-described double speed example, not all 10 I pictures are reproduced in 1/3 second, for example, 2.5 (seconds) / 10 (pieces) = 1/4, that is, 1 / By displaying one I picture every 4 seconds, it can be displayed at equal intervals (smooth). This is because, for example, the decoding unit 105 for I-picture dedicated operation starts time measurement from the start of display of one I picture, and receives a notification that display of one I picture is completed. If 4 seconds have not passed, the setting is made to temporarily stop the display. When 1/4 second has elapsed from the start of time measurement, the display pause is canceled and the next I picture is displayed repeatedly. Is possible.

  According to the above embodiment, it is possible to perform smooth special reproduction of recorded video. In particular, in multi-view broadcasting of digital broadcasting, even if only one program stream in the program has I picture position information or no stream at all, it is included in the program. Smooth special reproduction using an I picture can be performed on all program streams.

It is a block diagram which shows an example of a structure of the video recording / reproducing apparatus which concerns on 1st embodiment. It is a figure which shows an example of AV stream of the multi view broadcast which concerns on 1st embodiment. It is a flowchart which shows the procedure of the special reproduction process of the multi view broadcast which concerns on 1st embodiment. It is a figure which shows the relationship between AU and a time stamp. It is a schematic diagram which shows an example of a TTS packet. It is a schematic diagram which shows an example of the relationship between the TTS packet and AU in the AV stream memorize | stored in a recording medium. It is a schematic diagram which shows an example of the relationship between AU and I picture of AV stream memorize | stored in a recording medium, and its accompanying information.

Explanation of symbols

DESCRIPTION OF SYMBOLS 101 ... Tuner decoding part 102 ... Selector 103 ... Separation / extraction part 104 ... Input buffer part 105 ... Decoding part 106 ... Network interface part 107 ... Buffer management part 108 ... Clock reproduction part 109 ... Time stamp comparison / output part 110 ... Time stamp Addition unit 111 ... Reading unit 112 ... Writing unit 113 ... Recording medium 114 ... Control unit 115 ... User interface unit 116 ... Output unit 117 ... Fixed clock generating unit 201 ... Control information creating unit 202 ... Reading control unit

Claims (10)

A recording unit for recording content including the first program and the second program;
A playback unit for playing back the content recorded in the recording unit;
A playback device for playing back the second program based on information included in the first program.   The reproducing apparatus according to claim 1, wherein the recording unit is detachable from the reproducing apparatus. The content information transmitted including a plurality of pre-defined unit packetized information is received, and the program constituting the content information is composed of a plurality of program streams,
In the video recording / reproducing apparatus in which one stream of the program is recorded on a recording medium including specific frame information,
A recording / playback unit for playing back the recorded stream;
A control unit for instructing reading of the stream,
The control unit determines a reading position of the recorded stream based on the specific frame information, and instructs the recording / reproducing unit to reproduce the stream of the program instructed to reproduce. A video recording / reproducing apparatus characterized by the above. The specific frame information is MPEG I picture information,
4. The video according to claim 3, wherein the recording / reproducing unit includes a decoding unit, and gives an instruction of an I picture only mode for outputting only an I picture when a reproduction instruction is given, and outputs the I picture. Recording / playback device. The content information transmitted including a plurality of pre-defined unit packetized information is received, and the program constituting the content information is composed of a plurality of program streams,
In the special playback method of the video recording / playback apparatus, one stream of the program is recorded on a recording medium including specific frame information.
The control unit reads out a stream including a specific frame necessary for special playback based on the specific frame position information, and the control unit executes a program to be played back with respect to the read stream. Specifying a stream and giving a playback instruction to the recording / playback unit;
The separation / extraction unit of the recording / reproducing unit separates / extracts the stream of the program to be reproduced,
The decoding unit of the recording / reproducing unit includes a procedure for decoding and outputting the specific frame from the stream of the program to be reproduced, and a special reproducing method for a video recording / reproducing device. The specific frame information is MPEG I picture information,
6. The video according to claim 5, wherein the recording / reproducing unit includes a decoding unit, and gives an instruction of an I picture dedicated mode for outputting only an I picture when a reproduction instruction is given, and outputs the I picture. Special reproduction method for recording / reproducing apparatus. Receiving content information transmitted including a plurality of pre-specified unit packetized information,
The program constituting the content information is composed of a plurality of program streams,
In each of the unit information groups, a video recording in which the received time of the packet constituting the unit information group is recorded as a time stamp of the unit information group together with the unit information group on a recording medium. In the playback device,
A recording / playback unit for playing back the recorded stream;
A control unit for instructing reading of the stream,
The control unit receives an instruction for special reproduction of a stream of a program, determines a unit information group to be read with reference to a time stamp of the unit information group, and performs the reproduction included in the unit information group. A video recording / reproducing apparatus for instructing the recording / reproducing unit to reproduce a stream of an instructed program. The unit information group includes an MPEG I picture,
8. The video recording / reproducing apparatus according to claim 7, wherein the control unit instructs the decoding unit of the recording / reproducing unit to reproduce the I picture. Receiving content information transmitted including a plurality of pre-specified unit packetized information,
The program constituting the content information consists of a plurality of program streams,
In each of the unit information groups, a video recording / reproducing apparatus recorded on a recording medium together with the unit information group is the time when the first packet constituting the unit information group is received as the time stamp of the unit information group In the special playback method of
A procedure in which the control unit of the video recording / reproducing apparatus receives an instruction for special reproduction of a stream of a program;
The controller determines a unit information group to be read with reference to the time stamp of the unit information group,
A video recording / reproducing apparatus, wherein the control unit includes a procedure for instructing the recording / reproducing unit to reproduce the stream of the instructed program included in the read unit information group. Special playback method. The unit information group includes an MPEG I picture,
10. The special reproduction method of the video recording / reproducing apparatus according to claim 9, wherein the control unit further includes a procedure for instructing the decoding unit of the recording / reproducing unit to reproduce the I picture.

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