JP2001238208A - Moving picture decoding method and moving picture decoder - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a moving picture decoder that can surely display an accurately decoded frame from any frame in the case of play-list reproduction. SOLUTION: The moving picture decoder decodes a GOP reproduced from a recoding medium according to an edit list designating a display start frame and starts the display from a designated display start frame when decoding of the display start frame is finished. In this case, when a reference frame of the display start frame is not in existence in the GOP whose decoding is started, the immediately preceding GOP is re-entered decoded again. Then the display is started from the display start frame whose decoding is finished. Through the operation above, when a play list is reproduced, any frame can accurately be decoded and displayed.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a moving picture decoding method and a moving picture decoding apparatus used for reproducing and decoding an encoded code sequence.

[0002]

2. Description of the Related Art As a method for compressing and encoding a moving image, a method utilizing correlation between frames is widely known. The MPEG standard, which is an international standard, is one such method. Here, as an example, for the MPEG system,
The moving picture coding method will be described with reference to the drawings.

FIG. 14 is a diagram showing a frame order of an original image and an encoded code string in the MPEG system and a correlation between the frames. Now, it is assumed that an original image as shown in FIG. Here, the arrow on FIG. 14A indicates the correlation between the frames, and indicates the frame in which the starting point of the arrow is referred to and the frame in which the end point is referred to. For example, frame # 5 is encoded using frame # 2 as a reference frame, and frame # 7 is encoded using frames # 5 and # 8 as reference frames.

[0004] Considering the decoding of a code string encoded in this way, the referenced frame must be already decoded at the time of decoding the referenced frame.

For example, to decode frame # 7,
Frame # 5 and frame # 8 must have been decoded. Therefore, in the MPEG system, the frame sequence of the code sequence is different from the frame sequence of the original image. FIG. 14 (a)
FIG. 14 shows a code string obtained by encoding
(B). Here, I, P, and B indicate an intra-coded frame, a forward inter-coded frame, and a bidirectional inter-coded frame, respectively. Also, a set of frames from I frame to I frame in a code string is called a GOP (Group of Picture). Generally, this GOP is recorded on a recording medium in units of GOP. In FIG. 14, GOPs are from frame # 0 to frame # 5, and from frame # 6 to frame # 11.

Now, display is started from an arbitrary frame.
Consider performing a so-called playlist playback. In this reproduction method, a code string recorded on a recording medium is read from a GOP in which a display start frame exists, and decoding processing is started. Then, when the decoding process is completed up to the frame where the reproduction is started, the display is started.

[0007] For example, a case where reproduction is started from frame # 5 of the code string shown in FIG. At this time, as shown in FIG. 15B, GOP # 0 is reproduced from the recording medium, and the decoding process is performed. Decoding is performed in order from frame # 2, and display starts when frame # 5 is decoded. Since the display timing of the code string is determined by the decoding processing unit, detailed description is omitted.

Next, the case where the display start frame is frame # 6 will be described. At this time, as shown in FIG. 15 (c), reproduction is performed from GOP # 1 where frame # 6 exists, and decoding is performed. However, since frame # 5, which is the forward reference frame of frame # 6, has not been decoded, frame # 6 cannot be correctly decoded. For correct decoding, it is necessary to input from GOP # 0.

As described above, depending on the frame for starting the display, the GOP for starting the decoding may have to be sent immediately before.

[0010] Further, in editing or the like, a GOP in which a reference frame exists may be deleted. In this case, some frames are not correctly decoded because there is no reference frame.

[0011]

SUMMARY OF THE INVENTION In view of such a problem, an object of the present invention is to propose a moving picture decoding apparatus which outputs a picture decoded correctly from any frame in reproduction of a playlist. Things.

In addition, in the case of editing or the like, when a reference frame used for prediction is not recorded on a recording medium, decoding is not interrupted, and a distorted image is not displayed. It is an object of the present invention to propose a video decoding device that guarantees display.

[0013]

In order to solve this problem, a moving picture decoding method according to the present invention comprises a first group of frames in a moving picture coded by intra-frame coding and inter-frame coding. When decoding to display from the first frame included in, if the reference frame of the first frame does not exist in the first frame group, decoding from the second frame group in which the reference frame exists It is characterized in that

Further, in the moving picture decoding method according to the present invention, the frame group is constituted by a cycle in which intra-frame encoding is performed.

In the moving picture decoding method according to the present invention, the frame group includes one or a plurality of intra-coded frames.

The moving picture decoding method according to the present invention is characterized in that decoding is performed using one or a plurality of frame groups as an access unit.

In order to solve this problem, a moving picture decoding method according to the present invention provides a method for decoding a first moving picture included in a first frame group in a moving picture coded by intra-frame coding and inter-frame coding. When decoding to display from a frame, when the reference frame of the first frame does not exist in the first frame group, it is displayed from the second frame in the first frame group. Is what you do.

Further, in the moving picture decoding method according to the present invention, the frame group is constituted by a period in which intra-frame encoding is performed.

In the moving picture decoding method according to the present invention, the frame group includes one or a plurality of intra-coded frames.

A moving picture decoding method according to the present invention is characterized in that decoding is performed using one or a plurality of frame groups as an access unit.

In the moving picture decoding method according to the present invention, the second frame is a frame that is temporally closest to the first frame in display order.

In order to solve this problem, a moving picture decoding method according to the present invention provides a method of decoding a first moving picture included in a first frame group in a moving picture encoded by intra-frame encoding and inter-frame encoding. When decoding to display from a frame, if decoding of the first frame cannot be performed, display is performed from the second frame of the second frame group.

The moving picture decoding method according to the present invention is characterized in that when the first frame cannot be decoded, the first frame is skipped due to an error.

Further, in the moving picture decoding method according to the present invention, the frame group is constituted by a cycle in which intra-frame encoding is performed.

In the moving picture decoding method according to the present invention, the frame group includes one or a plurality of intra-coded frames.

The moving picture decoding method according to the present invention is characterized in that decoding is performed using one or a plurality of frame groups as an access unit.

[0027] In the moving picture decoding method according to the present invention, the second frame group may be composed of frames displayed temporally later than the frames constituting the first frame group. It is a feature.

In order to solve this problem, a moving picture decoding apparatus according to the present invention provides a moving picture decoding apparatus comprising: a recording medium that records a code sequence obtained by encoding a moving image by intra-frame encoding and inter-frame encoding;
A video decoding device that decodes the code string according to reproduction signal control information, wherein the reproduction signal control information is a predetermined code for starting display among the code strings recorded on the recording medium. Information indicating a frame, wherein the video decoding device includes: a code string reproducing unit that reproduces the code string from the recording medium; and a first frame group in which the predetermined frame exists according to the reproduction signal control information. From the start, the reproduction signal control means for controlling the code string reproduction means, the reproduction signal control information and the first frame group reproduced by the code string reproduction means as input, the first frame Code string decoding means for decoding the group and, when decoding of the predetermined frame is completed, starting output from the predetermined frame. When the reference frame of the frame does not exist in the first frame group, the reproduction signal control unit requests the reproduction signal control unit to input again from the second frame group in which the reference frame exists, and the reproduction signal control unit Controlling the code string reproducing means to reproduce from the second frame group, wherein the code string decoding means inputs from the second frame group reproduced by the code string reproducing means, The second frame group is decoded, and when the decoding of the predetermined frame is completed, the output is started from the predetermined frame.

Further, in the moving picture decoding apparatus according to the present invention, the recording medium is an optical disk.

Further, in the moving picture decoding apparatus according to the present invention, the frame group is constituted by a cycle in which intra-frame encoding is performed.

Further, in the moving picture decoding apparatus according to the present invention, the frame group includes one or a plurality of intra-coded frames.

Further, the moving picture decoding apparatus according to the present invention is characterized in that decoding is performed using one or a plurality of frame groups as an access unit.

In the moving picture decoding apparatus according to the present invention, the reproduction signal control information is recorded on the recording medium.

In the moving picture decoding apparatus according to the present invention, the reproduction signal control information is information specified externally by a user.

In the moving picture decoding apparatus according to the present invention, the reproduction signal control information may include a PTS (presentation time stamp) of the predetermined frame in the MPEG encoding system.
It is characterized by being.

[0036] In the moving picture decoding apparatus according to the present invention, the reproduction signal control information is information indicating the first frame group and display order in the first frame group. Things.

In order to solve this problem, a moving picture decoding apparatus according to the present invention provides a moving picture decoding apparatus comprising: a recording medium that records a code sequence obtained by encoding a moving image by intra-frame encoding and inter-frame encoding;
A video decoding device that performs a decoding process on the code sequence according to reproduction signal control information, wherein the reproduction signal control information includes a code sequence starting to be displayed among the code sequences recorded on the recording medium. Information indicating one frame,
The video decoding apparatus may include a code string reproducing unit that reproduces the code string from the recording medium, and start reproduction from a first frame group in which the first frame exists according to the reproduction signal control information. In, the reproduction signal control means for controlling the code string reproduction means, and the first frame group reproduced by the reproduction signal control information and the code string reproduction means as input, decoding the first frame group, When the decoding of the first frame is completed, the code frame decoding means for starting output from the first frame, the code string decoding means, the reference frame of the first frame is the If the frame does not exist in the first frame group, a frame or a frame in which only the frames in the first frame group among the frames in the first frame group are used as reference frames. Among the inner-coded frames, a frame that is temporally closest to the first frame in display order is set as a second frame, and when the decoding of the second frame is completed, the frame is output from the second frame. It is characterized by starting.

The moving picture decoding apparatus according to the present invention is characterized in that the recording medium is an optical disc.

Further, in the moving picture decoding apparatus according to the present invention, the frame group is constituted by a cycle in which intra-frame encoding is performed.

In the moving picture decoding apparatus according to the present invention, the frame group includes one or a plurality of intra-coded frames.

The moving picture decoding apparatus according to the present invention is characterized in that decoding is performed using one or a plurality of frame groups as an access unit.

Further, in the moving picture decoding apparatus according to the present invention, the reproduction signal control information is recorded on the recording medium.

Further, in the moving picture decoding apparatus according to the present invention, the reproduction signal control information is information specified externally by a user.

Also, in the moving picture decoding apparatus according to the present invention, the reproduction signal control information may be a PTS (presentation time stamp) of the first frame in the MPEG encoding system.
It is characterized by being.

Further, in the moving picture decoding apparatus according to the present invention, the reproduction signal control information is information indicating the first frame group and the display order in the first frame group. Things.

In order to solve this problem, a moving picture decoding apparatus according to the present invention provides a moving picture decoding apparatus comprising: a recording medium that records a code string obtained by encoding a moving picture by intra-frame coding and inter-frame coding;
A video decoding device that performs a decoding process on the code sequence according to reproduction signal control information, wherein the reproduction signal control information includes a code sequence starting to be displayed among the code sequences recorded on the recording medium. Information indicating one frame,
The video decoding apparatus may include a code string reproducing unit that reproduces the code string from the recording medium, and start reproduction from a first frame group in which the first frame exists according to the reproduction signal control information. In, the reproduction signal control means for controlling the code string reproduction means, and the first frame group reproduced by the reproduction signal control information and the code string reproduction means as input, decoding the first frame group, When the decoding of the first frame is completed, the code frame decoding means for starting output from the first frame, the code string decoding means, the reference frame of the first frame is the If it does not exist in the first frame group, it requests the reproduction signal control means to re-input from the second frame group in which the reference frame exists, and the reproduction signal control means It is determined whether a second frame group exists on the recording medium, and when the second frame group exists on the recording medium, the reproduction signal control unit reproduces the second frame group from the second frame group. Controlling the code string reproducing means, the code string decoding means, the second frame group reproduced by the code string reproducing means is input,
After decoding the first frame, perform output start,
When the second frame group does not exist on the recording medium, the reproduction signal control unit notifies the code string decoding unit that the second frame group does not exist on the recording medium. Decoding means, among the frames in the first frame group, among the frames having only the frames in the first frame group as reference frames or the intra-frame coded frames, the first A frame that is temporally closer to the frame in display order is a second frame, and when the decoding of the second frame is completed,
The output is started from the second frame.

In the moving picture decoding apparatus according to the present invention, the recording medium is an optical disc.

Further, in the moving picture decoding apparatus according to the present invention, the frame group is constituted by a cycle in which intra-frame encoding is performed.

In the moving picture decoding apparatus according to the present invention, the frame group includes one or a plurality of intra-coded frames.

The moving picture decoding apparatus according to the present invention is characterized in that decoding is performed using one or a plurality of frame groups as an access unit.

In the moving picture decoding apparatus according to the present invention, the reproduction signal control information is recorded on the recording medium.

The moving picture decoding apparatus according to the present invention is characterized in that the reproduction signal control information is information specified externally by a user.

In the moving picture decoding apparatus according to the present invention, the reproduction signal control information may be a PTS (presentation time stamp) of the first frame in the MPEG encoding system.
It is characterized by being.

Further, in the moving picture decoding apparatus according to the present invention, the reproduction signal control information is information indicating the first frame group and the display order in the first frame group. Things.

In order to solve this problem, a moving picture decoding apparatus according to the present invention provides a moving picture decoding apparatus comprising: a recording medium that records a code sequence obtained by encoding a moving image by intra-frame encoding and inter-frame encoding;
A video decoding device that performs a decoding process on the code sequence according to reproduction signal control information, wherein the reproduction signal control information includes a code sequence starting to be displayed among the code sequences recorded on the recording medium. Information indicating one frame,
The video decoding apparatus may include a code string reproducing unit that reproduces the code string from the recording medium, and start reproduction from a first frame group in which the first frame exists according to the reproduction signal control information. The reproduction signal control means for controlling the code string reproduction means, the reproduction signal control information and the first frame group reproduced by the code string reproduction means as input, the first frame group is encoded Decoding the first frame group while checking whether an error is inconsistent with the standard of the predetermined encoding method, and when decoding of the first frame is completed, starting output from the first frame. And a code string decoding unit that performs error processing according to the importance of the error when the first frame group includes the error. If the by error processing the first frame can not be decoded, in which the first to frame decoding has been completed and the second frame, and performs an output starting from the second frame.

In the moving picture decoding apparatus according to the present invention, the frame group is constituted by a cycle in which intra-frame encoding is performed.

In the moving picture decoding apparatus according to the present invention, the frame group includes one or a plurality of intra-coded frames.

The moving picture decoding apparatus according to the present invention is characterized in that decoding is performed using one or a plurality of frame groups as an access unit.

Further, the moving picture decoding apparatus according to the present invention is characterized in that the error processing skips a frame and restarts decoding from a predetermined frame according to the importance of the error. is there.

The moving picture decoding apparatus according to the present invention is characterized in that the recording medium is an optical disc.

[0061] In the moving picture decoding apparatus according to the present invention, the reproduction signal control information is recorded on the recording medium.

[0062] In the moving picture decoding apparatus according to the present invention, the reproduction signal control information is information specified externally by a user.

In the moving picture decoding apparatus according to the present invention, the reproduction signal control information may be a PTS (presentation time stamp) of the first frame in the MPEG encoding system.
It is characterized by being.

In the moving picture decoding apparatus according to the present invention, the reproduction signal control information is information indicating the first frame group and the display order in the first frame group. Things.

[0065]

Embodiments of the present invention will be described below with reference to the drawings. In the present embodiment, a case will be described in which the MPEG method is used as an encoding method and a unit of a screen at the time of encoding is a frame.

(Embodiment 1) A video decoding apparatus according to Embodiment 1 of the present invention will be described with reference to FIGS. 1, 2, 3, 4, and 5.
This will be described with reference to FIG. FIG. 1 is a block diagram of a moving image decoding apparatus including an optical head 101, a system controller 102, an edit list analyzer 103, a decoder 104, a switch 105, and an optical disk 106. FIG. 2 is a diagram for explaining a code string recorded on the optical disk 106.
FIG. 3 and FIG. 4 are views showing a decoding process of the moving picture decoding apparatus of the present invention. FIG. 5 is a diagram illustrating an edit list recorded on the optical disc 101.

On the optical disk 106, the code string and the edit list shown in FIG. 2B are recorded. A code string recorded on the optical disc 106 will be described with reference to FIG.
The moving image shown in FIG. 2A is subjected to an inter-frame encoding process, and becomes a code string shown in FIG. 2B. Here, 1
The GOP shows an example in which the GOP is composed of six frames.

Next, the edit list recorded on the optical disk 106 will be described. The information on the start of display is recorded in the edit list. Figure 5 shows an example of an edit list
This will be described with reference to FIG. In the example, the GOP number where the display start frame exists and the display order in the GOP are described. For example, entry 1 indicates the frame displayed first in GOP # 1, that is, frame # 6. Entry 2 indicates frame # 15 displayed fourth in GOP # 2. The edit list is stored in the optical disk 1 when or after the code string is recorded.
06.

The system controller 102 first causes the optical head 101 to reproduce the edit list from the optical disk 106.
Control. When reproducing the edit list, the system controller 102 controls the switch 105 to connect to A. Thus, the edit list reproduced from the optical disc 106 is input to the edit list analyzer 103.

First, an example when the entry 1 is executed will be described. Entry 1 is an example in which the frame displayed first in the GOP # 1, that is, the frame # 6 is the display start frame.

The edit list analyzer 103 analyzes the reproduced edit list and reproduces it from GOP # 1, and the information that the display start frame is the frame displayed first in the GOP, that is, the frame # 6. obtain.

The system controller 102 controls the optical head 1 based on the information obtained from the edit list analyzer 103 so that the optical head 1 reproduces data from GOP # 1 recorded on the optical disk 106.
01 is controlled. At this time, the system controller 102
Controls the switch 105 to connect to B. Thus, the reproduced code string is input to the decoder 104. The decoder 104 includes a system controller 1
From 02, control information indicating that the display start frame is frame # 6 is input.

The decoder 104 receives the input GOP # 1
Starts the decryption processing of. This will be described with reference to FIG. Decoder 104 starts decoding frame # 8 at time t. Subsequently, decoding of frame # 6 is started at time t + 1, and it is determined that the frame is a display start frame. Frame # 6
Is a B picture, the forward reference frame is frame # 5 of the immediately preceding GOP # 0, and the backward reference frame is frame # 8. The decoder 104 determines that the frame to be decoded from now is the display start frame, but cannot decode correctly because there is no forward reference frame, and the system controller 102 determines that there is no forward reference frame. Request to retransmit from GOP # 0.

Upon receiving a request for retransmission of the immediately preceding GOP from the decoder 104, the system controller 102
The optical head 101 is controlled so that the reproduction from step 06 is stopped. Thereafter, the system controller 102 sets GOP # 0
The optical head 101 is controlled so as to reproduce the data from, and the switch 105 is controlled so as to be connected to B.

From time t + 2, GOP # 0 is retransmitted, and frame # 2 is decoded. A decoding process is performed on the code strings input in order, and at time t + 9, a frame # 6
Is decrypted. The decoder 104 includes the system controller 10
The frame # 6 is determined to be the display start frame based on the control information from Step 2 and the output of the decoded frame is started.

Next, an example in which the entry 2 is executed will be described. Entry 2 is an example in which the frame displayed fourth in the GOP # 2, that is, frame # 15, is the display start frame.

The edit list analyzer 103 analyzes the edit list and obtains information that the entry 2 is to be reproduced from GOP # 2 and that the display start frame is frame # 16.

The system controller 102 controls the optical head 1 based on the information obtained from the edit list analyzer 103 so as to reproduce the data from GOP # 2 recorded on the optical disk 106.
01 is controlled. Thus, the reproduced code string is input to the decoder 104. Further, control information indicating that the display start frame is the frame # 15 is input from the system controller 102 to the decoder 104.

The decoder 104 receives the input GOP # 2
Starts the decryption processing of. This will be described with reference to FIG. Decoder 104 starts decoding frame # 14 at time t. At time t + 1, decoding of frame # 12 starts,
Frame # 12 is a B picture, and it is determined that decoding cannot be performed correctly because there is no forward reference frame, and decoding is skipped. Further, frame # 13 is similarly skipped.

At time t + 3, frame # 17 that can be correctly decoded is decoded. Subsequently, at time t + 4, frame #
The decoding of No. 15 is started, and it is known that this is the display start frame. When the decoding of the frame # 15 is completed, the display is started. The rearrangement of the code string after the decoding processing is performed inside the decoder 104.

That is, according to the present embodiment, the GOP reproduced from the optical disk is decoded in accordance with the edit list for specifying the display start frame, and when the decoding of the display start frame is completed, the specified display start frame is changed. Start display. At this time, if the reference frame of the display start frame does not exist in the GOP that has started decoding, the reference frame is input again from the immediately preceding GOP and re-decoded. Then, display is started from the display start frame for which decoding has been completed. By such an operation, in the reproduction of the playlist, decoding can be accurately performed from any frame,
Can be displayed.

According to the present embodiment, the retransmission of a GOP is limited to a case where the reference frame is not on the same GOP.
In order to guarantee accurate decoding and display from any frame, the display of the display start frame can be faster than in the case of always reproducing from the immediately preceding GOP.

In the present embodiment, the decoder 104
As shown in FIGS. 3 and 4, when decoding up to the display start frame, all frames are decoded, but it is not necessary to decode all frames. In the decoding process, only a frame that becomes a reference frame, that is, an I / P picture may be decoded. Thus, the display start frame can be detected at high speed.

In this embodiment, the optical disk 10
6, the PTS of the display start frame in MPEG may be described.

In the present embodiment, an example has been described in which only the display start information is described in the edit list, but the display stop time may also be described.

(Embodiment 2) In Embodiment 1, the display is controlled based on the edit list written on the optical disk 106. In the second embodiment, a case will be described in which display is controlled by a request from a user input from outside. In the second embodiment, an example is given in which the user designates the PTS of a frame. Here, it is assumed that the PTS for each frame is attached to a code string corresponding to each frame.

Embodiment 2 of the moving picture decoding apparatus according to the present invention
Will be described with reference to FIGS. 6, 7, and 8. FIG. FIG.
Are the optical head 101, user requests 201 and 206, user request analyzer 202, system controller 203, optical disk 204, user request memory 205, decoder 2
FIG. 17 is a block diagram of a moving image decoding device composed of a video decoding device 07. FIG. 7 is a diagram showing a decoding process of the video decoding device of the present invention. FIG. 8 illustrates the user request memory 205.

The optical head 101 shown in FIG. 6 is the same as that described with reference to FIG.

It is assumed that the code string shown in FIG. 2 is recorded on the optical disc 204. The user request 201 is
Decodes the code string recorded on the optical disc 204,
It is marked by the user's intention when watching on a monitor. For example, make a request at the next scene you want to see.
Alternatively, a request is issued at a start position and a stop position of a scene to be viewed.

The user request memory 205 stores the PTS of the frame displayed when the user request 201 was issued.
Record It is assumed that the PTS is notified by the system controller 203. Also, the system controller 2
03 receives PTS information from the decoder 207. An example of the contents of the user request memory 205 will be described with reference to FIG. This is an example in which a user request is made as a display start position while frames # 6, 9, and 14 are being displayed, and three entries are made, and a PTS corresponding to each frame is stored.

Next, the user enters the user request memory 205
Select one of the entries stored in. This is the user request 206.

The user request analyzer 202 receives the contents of the user request memory 205 and the user request 206 as inputs, and determines the GOP in which the PTS frame specified by the user request 206 exists. As an example of the judgment method,
When a GOP is recorded on the optical disc 204, the PTS of the first frame of each GOP is recorded, and the PTS of the first frame of the GOP and the PTS specified by the user are determined, so that the frame specified by the user exists. Identify the GOP. Here, it is assumed that entry 1, that is, frame # 6 is selected as the display start frame as the user request 206.

The system controller 203 controls the optical disk 204 based on the judgment obtained from the user request analyzer 202.
The optical head 101 is controlled so as to reproduce GOP # 1. The reproduced code string is input to the decoder 207.

The decoder 207 starts decoding the input code string. This will be described with reference to FIG. The decoder 207 checks, based on the PTS of the input code string, whether or not the frame is a display start frame. If the frame is not a display start frame and is a B picture, decoding processing is not performed, and the decoder skips to the next frame.

At time t, decoding of frame # 8 starts. Subsequently, decoding of frame # 6 is started at time t + 1, and it is determined that the frame is a display start frame. Frame # 6
Is the frame # 5 of the immediately preceding GOP # 0, and the backward reference frame is the frame # 8. The decoder 207 determines that the frame to be decoded from now is the display start frame, but cannot decode correctly because there is no forward reference frame, and transfers it to the system control unit 203 from GOP # 0. Request to.

Upon receiving a request for retransmission of the immediately preceding GOP from the decoder 207, the system controller 203
Stop playback from 04. After that, the optical head 101 is controlled so that reproduction is performed from GOP # 0.

GOP # 0 is retransmitted, and decoding of frame # 2 is performed at time t + 3. Decoder 207
Continues decoding a code string other than a B picture while searching for a display start frame. At time t + 6, frame # 6
Is determined to be the display start frame from the PTS, and the output is started. Note that the rearrangement of the code string after the decoding processing is performed inside the decoder 207.

That is, according to the present embodiment, the GOP reproduced from the optical disk is decoded in accordance with the user request for designating the display start frame, and when the decoding of the display start frame is completed, the designated display start frame is restored. Start display. At this time, if the reference frame of the display start frame does not exist in the GOP that has started decoding, the reference frame is input again from the immediately preceding GOP and re-decoded. Then, display is started from the display start frame for which decoding has been completed. With such an operation, it is possible to accurately decode and display any frame from playlist reproduction.

Further, the moving picture decoding apparatus of the present invention decodes only the reference frame out of the GOP reproduced from the recording medium in accordance with the edit list specifying the display start frame or the user's request. When the decoding of is completed, the display is started from the designated display start frame. With such an operation, the time required to start displaying the specified display start frame can be shortened.

In the present embodiment, the case where the reference frame of the display start frame is not in the same GOP has been described. However, if the reference frame is in the same GOP, the GOP is not requested to be retransmitted, and the decoding process is continued. Is what you do.

In this embodiment, the case where the PTS is attached to the code string for each frame is used as an example.
If there is no PTS, it is calculated from the frame with PTS.

In this embodiment, the user request 2
In the example described above, only when the display start frame is set as 01, a display stop frame at an arbitrary frame can be set. In that case, information on whether to start or stop displaying may be described in the user request memory 205.

(Embodiment 3) Next, a moving picture decoding apparatus according to Embodiment 3 of the present invention will be described with reference to FIGS.
This will be described with reference to FIG. FIG. 9 shows a system controller 301, an optical disk 302, a decoder 303, and an edit list analyzer 3
FIG. 4 is a block diagram of a moving image decoding apparatus including an optical head, an optical head, and a switch. FIG. 10 shows the optical disc 3
It is a figure explaining the code sequence recorded on 02. FIG.
FIG. 7 is a diagram showing a process of decoding by the video decoding device of the present invention.

First, a description will be given with reference to FIG. Optical head 1
01 and the switch 105 are the same as those described with reference to FIG.

On the optical disk 302, an edited code string and an edit list are recorded. A code string recorded on the optical disc 302 will be described with reference to FIG. It is assumed that the moving image A shown in FIG. 10A is inter-frame coded and becomes a code sequence shown in FIG. The code string shown in FIG.
It is assumed that OP # 0 has been deleted and the code string shown in FIG.

The PTS of the display start frame is recorded in the edit list recorded on the optical disk 302. Here, description will be made assuming that the contents of FIG. 8 are shown in the edit list.

The system controller 301 first controls the optical head 101 to reproduce the edit list from the optical disc 302.
Control. When reproducing the edit list, the system controller 301 controls the switch 105 to connect to A. Thus, the edit list reproduced from the optical disk 302 is input to the edit list analyzer 304. Here, a case where the entry 1, that is, the display start frame is the frame # 6 will be described as an example.

The edit list analyzer 304 checks the entry 1
The GOP in which the frame corresponding to the PTS exists is determined. As an example of the determination method, a GOP
Is recorded, if the PTS of the first frame of each GOP is recorded, the size of the PTS of the first frame and the PTS recorded in the edit list is determined, thereby identifying the GOP in which the display start frame exists. .

The system controller 301 controls the optical head 1 based on the information obtained from the edit list analyzer 304 to reproduce the data from GOP # 1 recorded on the optical disk 302.
01 is controlled. At this time, the system controller 301
Controls the switch 105 to connect to B. Thus, the reproduced code string is input to the decoder 303. The decoder 303 includes a system controller 3
From 01, control information indicating that the display start frame is frame # 6 is input.

The decoder 303 receives the input GOP # 1
Starts the decryption processing of. This will be described with reference to FIG. Decoder 303 starts decoding frame # 8 at time t. At time t + 1, decoding of frame # 6 starts, and it is determined that the frame is a display start frame. Frame # 6 is a B picture, and the forward reference frame is the immediately preceding GOP.
The frame # 5 is # 0, and the backward reference frame is frame # 8. Decoder 303 determines that the display start frame cannot be correctly decoded because there is no forward reference frame, and requests system controller 301 to retransmit from GOP # 0 where the forward reference frame exists.

Upon receiving a request for retransmission of the immediately preceding GOP from the decoder 303, the system controller 301
The GOP # 1 is controlled to be reproduced from the immediately preceding GOP # 0, but it is determined that GOP # 0 does not exist on the optical disk 302, and the decoder 303 is notified.

The decoder 303 is provided with a system controller 301.
And the display start frame is changed to frame # 8.
And display is started from time t + 3. The rearrangement of the code string after the decoding process is performed inside the decoder 303.

That is, in the present embodiment, the GOP reproduced from the recording medium is decoded according to the edit list or the user request for specifying the display start frame, and when the decoding of the display start frame is completed, the specified display is started. Display starts from the start frame. At this time, if the reference frame of the display start frame is not recorded on the recording medium by editing or the like, the display start frame is changed to the closest frame in the display order within the same GOP, and the frame is set as the display start frame, and the display is started. To start. By such an operation, in the reproduction of the playlist, it is possible to guarantee the reproduction of the playlist in which the correctly decoded frame is displayed without interrupting the decoding in every frame.

In the present embodiment, the case where the reference frame of the display start frame is not in the same GOP has been described. However, if the reference frame is in the same GOP, the GOP is not requested to be retransmitted, and the decoding process is continued. Is what you do.

In the present embodiment, the display start frame is the first I picture of the GOP in which the display start frame exists. However, the present invention is not limited to this, and any frame that can be decoded correctly may be used. Alternatively, any frame that can be decoded accurately and is closest to the display start frame in the display order and is displayed temporally after the display start frame may be used.

In the present embodiment, an example has been described in which an edit list is recorded on an optical disk. However, as in Embodiment 2 of the present invention, decoding is performed in response to a directly input user request. Processing may be performed.

In this embodiment, the reference frame of the display start frame is the GOP in which the display start frame exists.
When the GOP where the reference frame exists is not present on the same recording medium, the display start frame is changed to a frame that can be accurately decoded only when the GOP where the reference frame exists is not on the same recording medium. Even at a certain time, the time until the start of display can be shortened by changing the display start frame to a frame that can be decoded accurately without retransmitting the GOP. Note that the frame that can be correctly decoded is the GOP in which the display start frame exists.
Is the first I-picture in. Alternatively, any frame may be used as long as it is closest to the display start frame in the display order and is displayed temporally after the display start frame.

(Embodiment 4) Next, Embodiment 4 of the present invention will be described with reference to FIGS. FIG.
Are an optical head 101, an edit list analyzer 103, a switch 105, a system controller 401, an optical disk 402,
It is a block diagram of the video decoding device of the present invention composed of the decoder 403.

It is assumed that the code string shown in FIG. 2 is recorded on the optical disk 402. The edit list also includes
It is assumed that the display is written to start display from frame # 6.

The system controller 401 first controls the optical head 101 to reproduce the edit list from the optical disc 402.
Control. When reproducing the edit list, the system controller 401 controls the switch 105 to connect to A. Thus, the edit list reproduced from the optical disc 402 is input to the edit list analyzer 103.

The system controller 401 controls the optical head 1 based on the information obtained from the edit list analyzer 103 to reproduce the data from GOP # 1 recorded on the optical disk 402.
01 is controlled. At this time, the system controller 401
Controls the switch 105 to connect to B. As a result, the reproduced code string is input to the decoder 403. The decoder 403 includes a system controller 4
From 01, control information indicating that the display start frame is frame # 6 is input.

The decoder 403 decodes the input code string and starts displaying the decoded frame according to the control information input from the system controller 403.
Further, when an error occurs in the code string during the decoding process, the decoder 403 performs an error process according to the error level.

FIG. 13 shows an example of the error processing of the decoder 403. Here, a description will be given assuming that an error of level 1 has occurred during the decoding processing of frame # 8. At this time, the decoder 403 performs error processing according to FIG. By this error processing, the decoder 403 skips to frame # 14, and after the error processing is completed, restarts decoding from frame # 14.

The decoder 403 includes a system controller 401
If the display start frame is skipped by the error processing and cannot be detected based on the control information input from the controller and the decoded frame information, frame # 14 is set as the display start frame and the display is started. Note that the rearrangement of the code string after the decoding processing is performed inside the decoder 403.

That is, according to the present embodiment, the GOP reproduced from the recording medium is decoded according to the edit list or the user request for specifying the display start frame, and when the decoding of the display start frame is completed, the designated GOP is decoded. Display starts from the display start frame. Further, during this decoding processing, a syntax error is checked, and error processing is performed according to the error level. If the display start frame cannot be decoded by this error processing during decoding up to the display start frame, display is started from that frame when output preparation for a frame returning from an error is ready. By such an operation, the reproduction can be continued in the reproduction of the playlist, and the reproduction of the playlist can be guaranteed from any frame.

In this embodiment, the case where the display start frame cannot be detected by the error processing has been described. However, even if there is no error, the display start frame cannot be detected, and the display start frame is displayed later than the display start frame. When it is known from the frame information that the decoding of the frame to be completed is completed, the display is started from that frame.

In the present embodiment, an example is described in which an edit list is recorded on an optical disk. However, as in the second embodiment of the present invention, decoding is performed in response to a directly input user request. Processing may be performed.

Although the above embodiment has been described using an optical disk as a recording medium, the present invention is not limited to this, and a hard disk or a semiconductor memory may be used.

[0129]

According to the moving picture decoding apparatus of the present invention, a GOP reproduced from a recording medium is decoded according to an edit list designating a display start frame or a user request.
When the decoding of the display start frame is completed, the display is started from the designated display start frame. then,
G at which the reference frame of the display start frame has started decoding
If it does not exist in the OP, it is input again from the previous GOP and re-decoded. Then, display is started from the display start frame for which decoding has been completed. With such an operation, it is possible to accurately decode and display any frame from playlist reproduction.

The moving picture decoding apparatus of the present invention decodes a GOP reproduced from a recording medium in accordance with an edit list or a user request for designating a display start frame. Display starts from the display start frame. At that time, the reference frame of the display start frame is the GO which started decoding.
If it does not exist in P, it is input again from the previous GOP and re-decoded. Then, display is started from the display start frame for which decoding has been completed. Since the retransmission of the GOP is limited to the case where the reference frame is not on the same GOP as described above, in order to guarantee that decoding and display can be performed accurately from any frame, it is always necessary to compare the reproduction with the previous GOP. Thus, the display of the display start frame can be speeded up.

The moving picture decoding apparatus of the present invention decodes only the reference frame out of the GOP reproduced from the recording medium in accordance with the edit list specifying the display start frame or the user's request, and decodes the display start frame. When the conversion is completed, the display is started from the specified display start frame. With such an operation, the time required to start displaying the specified display start frame can be shortened.

The moving picture decoding apparatus of the present invention decodes a GOP reproduced from a recording medium in accordance with an edit list for specifying a display start frame or a user's request. Display starts from the display start frame. At this time, if the reference frame of the display start frame is not recorded on the recording medium by editing or the like, the display start frame is changed to the closest frame in the display order within the same GOP, and the frame is set as the display start frame, and the display is started. To start. By such an operation, in the reproduction of the playlist, it is possible to guarantee the reproduction of the playlist in which the correctly decoded frame is displayed without interrupting the decoding in every frame.

The moving picture decoding apparatus of the present invention decodes a GOP reproduced from a recording medium in accordance with an edit list for specifying a display start frame or a user request. Display starts from the display start frame. At this time, if the reference frame of the display start frame is not in the same GOP, the display start frame is changed to the closest frame in the display order in the same GOP, and the frame is set as the display start frame, and the display is started. With such an operation,
In the reproduction of the playlist, the display can be quickly started.

The moving picture decoding apparatus of the present invention decodes a GOP reproduced from a recording medium in accordance with an edit list for specifying a display start frame or a user's request. Display starts from the display start frame. Further, during this decoding processing, a syntax error is checked, and error processing is performed according to the error level. If the display start frame cannot be decoded by this error processing during decoding up to the display start frame, display is started from that frame when output preparation for a frame returning from an error is ready. By such an operation, the reproduction can be continued in the reproduction of the playlist, and the reproduction of the playlist can be guaranteed from any frame.

[Brief description of the drawings]

FIG. 1 is a block diagram illustrating Embodiment 1 of a video decoding device according to the present invention.

FIG. 2 is a schematic diagram for explaining Embodiment 1 of the video decoding device of the present invention.

FIG. 3 is a schematic diagram for explaining Embodiment 1 of the video decoding device of the present invention.

FIG. 4 is a schematic diagram for explaining Embodiment 1 of the video decoding device of the present invention;

FIG. 5 is a diagram for explaining Embodiment 1 of the video decoding device of the present invention.

FIG. 6 is a block diagram illustrating Embodiment 2 of the moving picture decoding apparatus according to the present invention.

FIG. 7 is a schematic diagram for explaining Embodiment 2 of the video decoding device of the present invention.

FIG. 8 is a diagram for explaining Embodiment 2 of the video decoding device of the present invention.

FIG. 9 is a block diagram illustrating Embodiment 3 of the video decoding device of the present invention.

FIG. 10 is a schematic diagram for explaining Embodiment 3 of the video decoding device of the present invention.

FIG. 11 is a schematic diagram for explaining Embodiment 3 of the video decoding device of the present invention.

FIG. 12 is a block diagram illustrating Embodiment 4 of a moving picture decoding apparatus according to the present invention.

FIG. 13 is a diagram for explaining Embodiment 4 of the moving picture decoding apparatus of the present invention.

FIG. 14 is a schematic diagram for explaining a conventional example.

FIG. 15 is a schematic diagram for explaining a conventional example.

[Explanation of symbols]

 101 Optical head 201, 206 User request 202 User request analyzer 205 User request memory 102, 203, 301, 401 System controller 103, 304 Edit list analyzer 104, 207, 303, 403 Decoder 106, 204, 302, 402 Optical Disk

Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat II (reference) // G11B 20/10 321 H04N 5/92 H (72) Inventor Akihiko Yamazaki 2-5, Akimichi, Izumi-ku, Sendai-shi, Miyagi Address F-term in Matsushita Communication Sendai Research Laboratories (reference) BB06 DA04 DB09 DC06 DE06 5J064 AA01 BC01 BC02 BC25 BD03

Claims (52)

[Claims] When decoding to display from a first frame included in a first frame group in a moving image encoded by intra-frame encoding and inter-frame encoding, the first A moving image decoding method, wherein, when a reference frame of a frame does not exist in the first frame group, decoding is performed from a second frame group in which the reference frame exists. 2. The moving picture decoding method according to claim 1, wherein said frame group is constituted by a cycle at which intra-frame encoding is performed. 3. The frame group according to claim 1, wherein the frame group includes one or a plurality of intra-coded frames.
The moving picture decoding method according to the above. 4. The moving picture decoding method according to claim 1, wherein decoding is performed using one or a plurality of frame groups as an access unit. 5. When decoding to display from a first frame included in a first frame group in a moving image encoded by intra-frame encoding and inter-frame encoding, the first A moving picture decoding method, characterized in that when a reference frame of a frame does not exist in the first frame group, the frame is displayed starting from a second frame in the first frame group. 6. The moving picture decoding method according to claim 5, wherein said frame group is constituted by a cycle in which intra-frame encoding is performed. 7. The frame group according to claim 5, wherein said frame group includes one or a plurality of intra-coded frames.
The moving picture decoding method according to the above. 8. The moving picture decoding method according to claim 5, wherein decoding is performed using one or a plurality of frame groups as an access unit. 9. The moving picture decoding method according to claim 5, wherein said second frame is a frame which is temporally closest to said first frame in display order. 10. When decoding to display from a first frame included in a first frame group in a moving image encoded by intra-frame encoding and inter-frame encoding, A video decoding method, characterized in that, when decoding of a frame cannot be performed, display is performed from the second frame of the second frame group. 11. The moving picture coding method according to claim 10, wherein the decoding of the first frame cannot be performed because of skipping due to an error. 12. The frame group according to claim 10, wherein the frame group is constituted by a period in which intra-frame encoding is performed.
The moving picture decoding method according to the above. 13. The moving picture decoding method according to claim 10, wherein said frame group includes one or a plurality of intra-coded frames. 14. The moving picture decoding method according to claim 10, wherein decoding is performed using one or a plurality of frame groups as an access unit. 15. The moving image according to claim 10, wherein said second frame group is composed of frames displayed temporally later than frames constituting said first frame group. Decryption method. 16. A recording medium in which a code sequence obtained by encoding a moving image by intra-frame encoding and inter-frame encoding is recorded.
A video decoding device that decodes the code sequence according to reproduction signal control information, wherein the reproduction signal control information is a predetermined code for starting display of the code sequence recorded on the recording medium. Information indicating a frame, wherein the video decoding device includes: a code string reproducing unit that reproduces the code string from the recording medium; and a first frame group in which the predetermined frame exists according to the reproduction signal control information. To start playing from
A reproduction signal control unit for controlling the code string reproduction unit, the reproduction signal control information and the first frame group reproduced by the code sequence reproduction unit are input, and the first frame group is decoded. When the decoding of the frame is completed, a code string decoding unit that starts output from the predetermined frame is provided, and the code string decoding unit includes a reference frame of the predetermined frame in the first frame group. If not, the reproduction signal control unit is requested to re-input from the second frame group where the reference frame exists, and the reproduction signal control unit sets the code to reproduce from the second frame group. Controlling the column reproduction means, wherein the code string decoding means inputs from the second frame group reproduced by the code string reproduction means and decodes the second frame group. Wherein After a predetermined frame decoding is completed, the moving picture decoding apparatus which is characterized in that the output start from the predetermined frame. 17. The moving picture decoding apparatus according to claim 16, wherein said recording medium is an optical disk. 18. The frame group according to claim 16, wherein the frame group is constituted by a period in which intra-frame encoding is performed.
The moving picture decoding apparatus according to the above. 19. The moving picture decoding apparatus according to claim 16, wherein said frame group includes one or a plurality of intra-coded frames. 20. The moving picture decoding apparatus according to claim 16, wherein decoding is performed using one or a plurality of frame groups as an access unit. 21. The moving picture decoding apparatus according to claim 16, wherein said reproduction signal control information is recorded on said recording medium. 22. The reproduction signal control information according to claim 16, wherein the reproduction signal control information is information specified externally by a user.
The moving picture decoding apparatus according to the above. 23. The reproduction signal control information includes a PTS (presentat) of the predetermined frame in the MPEG encoding system.
17. The moving picture decoding apparatus according to claim 16, wherein the moving picture decoding apparatus is an ion time stamp. 24. The moving picture decoding apparatus according to claim 16, wherein said reproduction signal control information is information indicating said first frame group and a display order in said first frame group. . 25. A recording medium in which a code sequence obtained by encoding a moving image by intra-frame encoding and inter-frame encoding is recorded.
A video decoding device that decodes the code sequence according to reproduction signal control information, wherein the reproduction signal control information is used to start display of the code sequence recorded in the recording medium. Information indicating one frame, wherein the video decoding device includes: a code string reproducing unit that reproduces the code string from the recording medium; and a code string reproducing unit that has the first frame according to the reproduction signal control information. A reproduction signal control unit that controls the code string reproduction unit so that reproduction is started from one frame group, and the reproduction signal control information and the first frame group reproduced by the code string reproduction unit are input, and A decoding unit for decoding the first frame group and, when decoding of the first frame is completed, a code string decoding unit for starting output from the first frame; , When the reference frame of the first frame is not present in the first frame group,
Of the frames in the first frame group, only the frames in the first frame group are used as reference frames, or among the intra-coded frames, the display order is the most similar to the first frame. A moving image decoding apparatus, characterized in that a frame close in time is defined as a second frame, and when decoding of the second frame is completed, output is started from the second frame. 26. The moving picture decoding apparatus according to claim 25, wherein said recording medium is an optical disk. 27. The frame group according to claim 25, wherein the frame group is constituted by a period in which intra-frame encoding is performed.
The moving picture decoding apparatus according to the above. 28. The moving picture decoding apparatus according to claim 25, wherein said frame group includes one or a plurality of intra-coded frames. 29. The moving picture decoding apparatus according to claim 25, wherein decoding is performed using one or a plurality of frame groups as an access unit. 30. The moving picture decoding apparatus according to claim 25, wherein said reproduction signal control information is recorded on said recording medium. 31. The reproduction signal control information according to claim 25, wherein the reproduction signal control information is information specified externally by a user.
The moving picture decoding apparatus according to the above. 32. The reproduction signal control information includes a PTS (presentat) of the first frame in the MPEG encoding system.
26. The moving picture decoding apparatus according to claim 25, wherein the moving picture decoding apparatus is an ion time stamp. 33. A moving picture decoding apparatus according to claim 25, wherein said reproduction signal control information is information indicating said first frame group and a display order in said first frame group. . 34. A recording medium in which a code sequence obtained by encoding a moving image by intra-frame encoding and inter-frame encoding is recorded.
A video decoding device that decodes the code sequence according to reproduction signal control information, wherein the reproduction signal control information is used to start display of the code sequence recorded in the recording medium. Information indicating one frame, wherein the video decoding device includes: a code string reproducing unit that reproduces the code string from the recording medium; and a code string reproducing unit that has the first frame according to the reproduction signal control information. A reproduction signal control unit that controls the code string reproduction unit so that reproduction is started from one frame group, and the reproduction signal control information and the first frame group reproduced by the code string reproduction unit are input, and A decoding unit for decoding the first frame group and, when decoding of the first frame is completed, a code string decoding unit for starting output from the first frame; , When the reference frame of the first frame is not present in the first frame group,
Requests the reproduction signal control means to re-input from the second frame group where the reference frame exists, and the reproduction signal control means judges whether the second frame group exists on the recording medium. In the case where the second frame group is present on the recording medium, the reproduction signal control means controls the code string reproduction means to reproduce from the second frame group, and the code string decoding means Inputs the second frame group reproduced by the code string reproducing means, starts decoding after decoding the first frame, and the second frame group does not exist on the recording medium. In this case, the reproduction signal control means notifies the code string decoding means that the second frame group is not present on the recording medium, and the code string decoding means sets a frame in the first frame group. Of the frames, only the frames in the first frame group are used as reference frames, or among the intra-coded frames, the frame that is temporally closest to the first frame in display order is the second frame. A video decoding apparatus that starts output from the second frame when decoding of the second frame is completed. 35. The moving picture decoding apparatus according to claim 34, wherein said recording medium is an optical disk. 36. The frame group according to claim 34, wherein the frame group is constituted by a period in which intra-frame encoding is performed.
The moving picture decoding apparatus according to the above. 37. The moving picture decoding apparatus according to claim 34, wherein said frame group includes one or a plurality of intra-coded frames. 38. The moving picture decoding apparatus according to claim 34, wherein decoding is performed using one or a plurality of frame groups as an access unit. 39. The moving picture decoding apparatus according to claim 34, wherein said reproduction signal control information is recorded on said recording medium. 40. The reproduction signal control information according to claim 34, wherein the reproduction signal control information is information specified externally by a user.
The moving picture decoding apparatus according to the above. 41. The reproduction signal control information includes a PTS (presentat) of the first frame in the MPEG encoding system.
35. The moving picture decoding apparatus according to claim 34, wherein the moving picture decoding apparatus is an ion time stamp. 42. A moving picture decoding apparatus according to claim 34, wherein said reproduction signal control information is information indicating said first frame group and a display order in said first frame group. . 43. A recording medium in which a code string obtained by encoding a moving image by intra-frame encoding and inter-frame encoding is recorded.
A video decoding device that decodes the code sequence according to reproduction signal control information, wherein the reproduction signal control information is used to start display of the code sequence recorded in the recording medium. Information indicating one frame, wherein the video decoding device includes: a code string reproducing unit that reproduces the code string from the recording medium; and a code string reproducing unit that has the first frame according to the reproduction signal control information. Reproducing signal control means for controlling the code string reproducing means so as to start reproduction from one frame group; and inputting the reproduced signal control information and the first frame group reproduced by the code string reproducing means, Decoding the first frame group while checking whether the first frame group includes an error contrary to the standard of a predetermined encoded coding method, and decoding the first frame. A code string decoding means for starting output from the first frame when the first frame group includes the error. Depending on the degree, error processing is performed, and if the first frame cannot be decoded by the error processing, the first decoded frame is set as the second frame, and output is started from the second frame. A moving image decoding apparatus. 44. The frame group according to claim 43, wherein the frame group is constituted by a period in which intra-frame encoding is performed.
The moving picture decoding apparatus according to the above. 45. The moving picture decoding apparatus according to claim 43, wherein said frame group includes one or a plurality of intra-coded frames. 46. The moving picture decoding apparatus according to claim 43, wherein decoding is performed using one or a plurality of frame groups as an access unit. 47. The moving picture decoding apparatus according to claim 43, wherein said error processing skips a frame and restarts decoding from a predetermined frame according to the importance of said error. 48. The moving picture decoding apparatus according to claim 43, wherein said recording medium is an optical disk. 49. A moving picture decoding apparatus according to claim 43, wherein said reproduction signal control information is recorded on said recording medium. 50. The reproduction signal control information according to claim 43, wherein the reproduction signal control information is information designated externally by a user.
The moving picture decoding apparatus according to the above. 51. The playback signal control information includes a PTS (presentat) of the first frame in the MPEG encoding system.
The moving picture decoding apparatus according to claim 43, wherein the moving picture decoding apparatus is an ion time stamp. 52. A moving picture decoding apparatus according to claim 43, wherein said reproduction signal control information is information indicating said first frame group and a display order in said first frame group. .