JPH10150632A - Optical recording medium, animation recorder and animation reproducing device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an optical recording medium efficiently and consecutively recording compressed animation data, an animation recorder capable of efficiently and consecutively recording compressed animation data in the optical recording medium and an animation reproducing device capable of special reproduction by reduced seek time and buffer size from the optical recording medium. SOLUTION: When consecutively recording compressed animation data for an optical disk 5, the animation decoder equally divides an I picture into i-line of first tracks 50 to record and equally divides a P picture and B picture into j-line of second tracks 51 to record. Thereby the optical disk 5 efficiently and consecutively recording compressed animation data is obtained. In addition the animation reproducing device reproducing an animation from an optical disk 5 irradiates (i+j)-line of optical beams to the first and second tracks 50 and 51 from an optical head to normally reproduce and irradiates the first track 50 with j-line of optical beams from the optical head.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical recording medium on which digitally compressed moving image data is recorded, and a moving image recording apparatus for dividing digitally compressed moving image data into compression units and recording the divided data on the optical recording medium. The present invention also relates to a moving image reproducing apparatus for reproducing a moving image from an optical recording medium on which digitally compressed moving image data is recorded.

[0002]

2. Description of the Related Art A moving image compression algorithm is, for example, MPEG standardized by ISO (International Organization for Standardization).
(Moving Picture Coding Experts Group) algorithm. By using this algorithm, it is possible to perform special reproduction such as fast-forwarding, reverse-forwarding, and midway reproduction of a moving image.

In the MPEG algorithm, a moving image is reproduced by using predictive coding based on motion-compensated frame (screen) prediction.

[0004] The above-described motion compensated inter-frame prediction will be outlined. That is, in reproducing a moving image, the moving image often includes some subject in a still background.
When the subject is stationary, the difference image becomes almost 0 by performing inter-frame prediction. When the subject moves to some extent, a part of the image including the subject is cut out, the amount of the motion is obtained, and the subject is shifted from the reference frame by the amount of the motion, thereby predicting it as the image of the next frame. can do. This is called motion compensation inter-frame prediction.

Here, the motion compensated inter-frame prediction is
Although effective for compressing moving image information, the random access function cannot be realized because the information is always used based on the information of the previous frame (screen). Therefore, in MPEG, a compression unit called a GOP (Group of Pictures) in which moving images of a plurality of frames are combined is set as a unit that enables independent reproduction.

As shown in FIG. 2 which is an explanatory diagram of the present invention, an intra-frame coded image (Int
ra-coded picture) [hereinafter referred to as “I-picture”], unidirectional inter-frame predictive coded image (Predictive-c
oded picture) (hereinafter, referred to as “P picture”) and bidirectional inter-frame predictive coded image (Bidirectionally pr
edictive-coded picture) [hereinafter referred to as "B picture"].

[0007] The above-mentioned I-picture is image data which is intra-frame coded in the still picture mode and can be decoded independently. Since no other frame information is used, special reproduction can be performed using only this I-picture. It is possible. In addition, the P picture reproduces a moving image by performing forward motion compensation prediction from the reference picture using a decoded picture of a past I picture or P picture located earlier in time as a reference picture for prediction. Is what you do. Further, the B picture is a reference picture for prediction that is obtained by decoding a decoded picture of a past I picture or P picture located earlier in time and a decoded picture of a future I picture or P picture located later in time. A moving image is reproduced by performing bidirectional motion compensation prediction from these reference images. Therefore, neither the P picture nor the B picture can be reproduced alone.

Since the first frame to be encoded in each GOP must be an I picture, the first frame of the GOP is also an I picture when decoding.
That is, special reproduction is enabled by decoding only the I picture at the head of each GOP in order. Specifically, as shown in FIG. 10, a plurality of GOPs are continuously recorded in a video sequence having a certain time length.
The arrangement of the pictures in this example is not particularly limited except that the beginning is an I picture.

However, when GOP data, which is a basic unit of MPEG-compressed moving image data, is recorded on a storage medium such as an optical disk, if each GOP is recorded sequentially in chronological order, fast-forward reproduction is performed using only I pictures. When performing special playback such as playback or reverse playback, in order to seek from one I picture to the next I picture,
Useless time is required for seeking the P picture and the B picture in the GOP. For this reason, there is a problem that smooth special reproduction becomes difficult without a sufficient memory buffer suitable for the transfer rate.

In order to avoid this problem, a moving picture recording method and a moving picture reproducing apparatus disclosed in Japanese Patent Application Laid-Open No. 7-147664 record only an I picture in a continuous sector on the front side of an optical disk, and On the side, a P picture and a B picture are recorded in a continuous sector.

An upper optical head for irradiating the optical disk with a laser beam from the front side and a lower optical head for irradiating the laser beam from the back side with respect to the optical disk during normal reproduction. From both sides, I-pictures, B-pictures and P-pictures are decoded in GOP units, and at the time of special reproduction, only the I-pictures on the front side are decoded and the moving picture is reproduced without interruption.

Thus, normal reproduction can be performed by cooperation of the upper and lower light heads, and at the time of special reproduction, the special reproduction can be quickly performed by operating the upper optical head in a short seek time.

If the ratio of the data length of the I picture to the total data length of the P picture and the B picture deviates from 1 to 1 due to a change in the compression ratio, the dummy data is added to the shorter data length. By correcting the shift by adding padding data, the data length of the I picture in each GOP and the total data length of the P picture and the B picture are aligned.

A second conventional example is disclosed in Japanese Patent Application Laid-Open No. 61-9 / 1986.
The optical recording / reproducing apparatus disclosed in Japanese Patent Publication No. 34 irradiates an optical disk with a plurality of light beams and simultaneously records and reproduces image data from a plurality of tracks. This device speeds up the transfer rate of image data (the amount of information of data recorded or reproduced per unit time) by an increase in the number of light beams, as compared with the case where only one light beam is used. As a result, higher quality video can be recorded and reproduced. For this reason, for example, attention has been paid to a technology that can realize a video disk device for high-definition video.

[0015]

However, in the first conventional example, the compression ratio of the image greatly changes, and the ratio of the data length of the I picture to the total data length of the P picture and the B picture is 1 unit. In the case of a large deviation from one to one, the data length of padding data as dummy data becomes very large. For this reason, there is a problem that the unrecorded area on the optical disk becomes large, and the utilization efficiency of the recorded area of the optical disk is reduced.

That is, when it is desired to increase the compression ratio of an image to increase the recording time, the data length of the I picture is
It is necessary to reduce the total data length of the P picture and the B picture to a certain extent or more. For this reason, the data length of the padding data added to the P picture and the B picture becomes long, and the use efficiency of the recording area of the optical disc is greatly reduced.

Conversely, in order to reduce the compression ratio of an image and perform high-quality recording, it is necessary to reduce the data length of the I picture to a certain extent or more compared to the total data length of the P picture and the B picture. For this reason, the length of the padding data added to the I picture becomes longer this time, so that the use efficiency of the recording area of the optical disk is also greatly reduced.

In MPEG moving picture compression, compression can be performed while changing the compression ratio according to the magnitude of the motion of the image. That is, it is possible to perform control so that a monotonous image having a large motion is compressed at a high compression ratio, and a complex image having a small motion is compressed at a low compression ratio. As a result, the compression ratio can be improved while suppressing the deterioration of the image quality.

However, when the image compression ratio is changed as described above, the ratio between the data length of the I picture and the total data length of the P picture and the B picture in each GOP greatly changes. The length will vary greatly. For this reason, it is difficult to avoid a decrease in the use efficiency of the recording area of the optical disc.

That is, the first conventional example is effective only for I
The data length of a picture, the data length of a P picture and the data length of a B picture are almost the same, and this is limited to the case where the image compression ratio (in other words, the transfer rate) is fixed.

Further, in the second conventional example, the image data is recorded and reproduced by dividing the image data into a plurality of beams. However, how to distribute the image data to each beam is not considered. Therefore, the I picture as described above,
It is difficult to efficiently divide MPEG-compressed moving image data composed of P-pictures and B-pictures into a plurality of beams for recording, and it is difficult to read out only I-pictures and realize high-speed special reproduction. Has problems.

The present invention has been made in view of the above-mentioned conventional problems, and a first object of the present invention is to provide an MPE in which a frame is divided into an I picture, a P picture, and a B picture.
An object of the present invention is to provide an optical recording medium on which compressed moving image data such as G is efficiently recorded. A second object of the present invention is to
An object of the present invention is to provide an image recording apparatus capable of dividing compressed moving image data such as MPEG in which a frame is divided into an I picture, a P picture, and a B picture into a plurality of beams and efficiently recording the data on an optical recording medium. Further, a third object of the present invention is that a frame is an I picture, a P picture,
Another object of the present invention is to provide an image reproducing apparatus capable of performing special reproduction at a high speed from an optical recording medium on which compressed moving image data such as MPEG, which is divided into MPEG and B pictures, is recorded.

[0023]

According to a first aspect of the present invention, there is provided an optical recording medium comprising unidirectional interframe predictive encoded data and bidirectional interframe predictive encoded data. An optical recording medium on which compressed moving image data including inter-frame coded data and intra-frame coded data is recorded, wherein a first track on which intra-frame coded data is continuously recorded; A recording surface provided with a second track on which encoded data is continuously recorded, wherein the first track and the second track are
At least one of the intra-frame coded data and the inter-frame predicted coded data is divided into a plurality of tracks and recorded.

That is, in the optical recording medium according to the first aspect of the present invention, (1) both the first track and the second track are provided in a plurality, and the intra-frame encoded data is stored in each of the first tracks. Data obtained by equally dividing the number of tracks into one track is recorded, and data obtained by dividing the inter-frame prediction coded data into the number of second tracks is recorded in each of the second tracks, or (2) ) Only a plurality of first tracks are provided, and in each of the first tracks, data obtained by dividing intra-frame coded data into the number of first tracks is recorded. In each of the second tracks, data obtained by dividing the inter-frame prediction encoded data into the number of the second tracks is recorded.

According to the above configuration, the first track on which the intra-frame coded data is continuously recorded on one recording surface, for example, only one side of the optical disk, and the inter-frame predicted coded data are continuously recorded. A recorded second track can be provided. As a result, in the optical recording medium, normal reproduction and special reproduction can be performed with a smaller moving image reproducing apparatus as compared with the case where the first track and the second track are provided on different recording surfaces.

Further, according to the above configuration, in the first track and the second track, at least one of the intra-frame encoded data and the inter-frame predictive encoded data is recorded while being divided into a plurality of tracks. ing.

Therefore, even if the compression ratio of the image changes,
Even if the ratio between the data length of the intra-frame encoded data and the data length of the inter-frame predictive encoded data deviates greatly from 1: 1, by increasing or decreasing the number of first tracks and / or the number of second tracks. By adjusting the ratio between the data length of the first track and the data length of the second track, the difference can be reduced. As a result, the amount of padding data on the track of the optical recording medium can be reduced.
The use efficiency of the recording area of the optical recording medium can be improved.

Further, in the above configuration, it is desirable to divide the encoded data into a plurality of tracks equally, that is, to make the data length of each track equal.
As a result, the data length in the track (at least one of the first track and the second track) in which the encoded data (at least one of the intra-frame encoded data and the inter-frame predictive encoded data) to be divided and recorded is recorded is , The encoded data is divided by the number of tracks. As a result, the amount of padding data in the track of the optical recording medium can be further reduced, so that the use efficiency of the recording area of the optical recording medium can be further improved.

The optical recording medium according to claim 2 of the present invention
In order to solve the above-mentioned problem, in the optical recording medium according to claim 1, the number of the first tracks and the number of the second tracks are equal to the ratio of the number of the first tracks to the number of the second tracks, and It is characterized in that the difference between the total data length of the encoded data and the ratio of the total data length of the inter-frame prediction encoded data is set to be small.

Thus, even if the compression ratio of the image changes due to the change in the compression ratio, the ratio of the data length of the intra-frame coded data to the data length of the inter-frame prediction coded data is increased from 1: 1. Even if the ratio deviates, the ratio of the number of the first tracks to the number of the second tracks, and the ratio of the total data length of the intra-frame coded data to the total data length of the inter-frame prediction coded data should be substantially the same. Can be.

Specifically, for example, when the ratio of the data length of the intra-frame coded data to the data length of the inter-frame predicted coded data is 2: 1, two out of three light beams are used. The data of the intra-frame coded data is equally divided and recorded on two first tracks by the two light beams,
The data length of the first track and the data length of the second track can be matched by recording the inter-frame predictive encoded data on one second track by the remaining one light beam.

As a result, the data length of the first track and the second track
The data length of the track can be made substantially the same.
As a result, padding data can be omitted, so that efficient recording using the recording area of the optical recording medium effectively can be realized.

An optical recording medium according to a third aspect of the present invention comprises:
An optical recording medium according to claim 1 or 2, wherein the intra-frame coded data and the inter-frame predicted coded data, and the first track and the second track.
It is characterized by having a management data area for recording management data for managing a relationship with a track.

[0034] According to the above configuration, the intra-frame coded data and the inter-frame predictive coded data are respectively determined by the management data recorded in the management data area.
It is possible to decode the intra-frame encoded data and the inter-frame predictive encoded data while confirming which sector of the track and the second track is recorded.
Therefore, a moving image can be reproduced while accurately expanding the compressed moving image data.

According to a fourth aspect of the present invention, there is provided a moving picture recording apparatus, comprising: inter-frame predictive encoded data comprising unidirectional inter-frame predictive encoded data and bidirectional inter-frame predictive encoded data; A moving image recording apparatus for recording compressed moving image data on an optical recording medium, comprising: a first recording medium for recording intra-frame predictive encoded data on an optical recording medium having a recording surface provided with a plurality of tracks. A light beam and a second light beam for recording the inter-frame predictive encoded data are simultaneously irradiated to different positions on the recording surface, and the intra-frame encoded data is transmitted by a number equal to the number of the first light beams. At the same time, the inter-frame prediction encoded data is continuously recorded on the second track having the same number as the second light beam. At least one of-coding data and the inter-frame predictive encoded data, is characterized by recording in a plurality of tracks.

According to the above configuration, even if the compression ratio of the image changes and the ratio between the data length of the intra-frame coded data and the data length of the inter-frame predicted coded data greatly deviates from 1: 1. , The number of first light beams and / or the second
By increasing or decreasing the number of light beams, the difference in the data length of each track can be reduced. As a result, the amount of padding data on the track of the optical recording medium can be reduced, so that more efficient recording can be performed on the optical recording medium.

Further, according to the above configuration, one of the optical recording media is provided.
Since image data can be recorded on only one recording surface, the size of the apparatus can be reduced.

The irradiation of the first light beam and the second light beam is performed by irradiating the first light beam to the same number of the first tracks as the number of the first light beams and by irradiating the second light beam with the first light beam. The irradiation may be performed by an irradiation unit that irradiates the second light beam to the second tracks whose number is equal to the number of the beams. As the irradiation means, for example, an optical head having three or more semiconductor lasers can be used.

In order to record at least one of the intra-frame encoded data and the inter-frame prediction encoded data in a plurality of tracks, the intra-frame encoded data or the inter-frame predicted encoded data must be recorded. Is preferably provided. As the dividing means, for example, a switch circuit can be used.

According to a fifth aspect of the present invention, in the moving image recording apparatus according to the fourth aspect, the intra-frame coded data and the inter-frame predictive coded data, and the first and second tracks are used. And management data generating means for generating management data for managing the relationship described above, wherein the management data is recorded on an optical recording medium together with intra-frame encoded data and inter-frame predictive encoded data.

According to the above configuration, management data for managing the relationship between the intra-frame coded data and the inter-frame predicted coded data and the first track and the second track is generated by the management data generating means, The management data can be recorded on the optical recording medium together with the intra-frame encoded data and the inter-frame predictive encoded data.

Thus, in the optical recording medium recorded by the moving picture recording apparatus having the above-described structure, the intra-frame encoded data and the inter-frame predictive encoded data can be stored in any of the first track and the second track by the management data. It is possible to decode the intra-frame coded data and the inter-frame predicted coded data while confirming which sector is recorded. Therefore, the optical recording medium recorded by the moving picture recording apparatus having the above configuration can reproduce a moving picture while accurately expanding the compressed moving picture data.

According to a sixth aspect of the present invention, there is provided a moving image reproducing apparatus for reproducing a moving image from the optical recording medium according to the first aspect, wherein a first track and a second track of the optical recording medium are provided. By irradiating the same number of light beams as the sum of the number of the first tracks and the number of the second tracks, the intra-frame encoded data and the inter-frame prediction encoded data are simultaneously read, and the read intra-frame encoded data is read out. And performing normal reproduction based on the inter-frame prediction encoded data, and irradiating the first track of the optical recording medium with the same number of light beams as the number of the first tracks to read the intra-frame encoded data, Special reproduction is performed based on the read intra-frame encoded data.

According to the above arrangement, since the first track and the second track of the optical recording medium can be irradiated with the light beam and only the intra-frame coded data can be continuously reproduced, a high-speed special operation without a track jump can be performed. Reproduction becomes possible. In addition, a moving image can be normally reproduced and specially reproduced from only one recording surface of the optical recording medium, and the size of the apparatus can be reduced.

According to a seventh aspect of the present invention, in the moving image reproducing apparatus according to the sixth aspect, the relationship between the intra-frame encoded data and the inter-frame predictive encoded data and the first track and the second track is determined. A management data reproducing unit for reproducing management data for management; demodulating the intra-frame coded data and the inter-frame predicted coded data recorded on the first track and the second track based on the management data; It is characterized by:

According to the above arrangement, the intra-frame coded data and the inter-frame prediction coded data recorded on the first track and the second track are demodulated based on the management data reproduced by the management data reproducing means. . Therefore, while confirming in which first track and which sector of the second track the intra-frame encoded data and the inter-frame predictive encoded data are respectively recorded,
Demodulation of intra-frame encoded data and inter-frame predictive encoded data can be performed. As a result, a moving image can be reproduced while accurately expanding the compressed moving image data.

[0047]

1 to 9 show an optical recording medium, a moving picture recording apparatus and a moving picture reproducing apparatus according to the present invention.
This will be described below with reference to FIG.

As shown in FIG. 1, an optical disk 5 as an optical recording medium according to the present invention has a spiral first track 50 and j second tracks 51 (i and j).
Has a recording surface provided with an arbitrary positive integer. FIG. 1 shows the recording surface when i = 4 and j = 3.

The optical disk 5 has an MPEG compression system composed of an I picture (intra-frame encoded data), a B picture (bidirectional inter-frame encoded data), and a P picture (unidirectional inter-frame encoded data). Moving image data is recorded in GOP units.

One G in MPEG compressed moving image data
The OP includes, for example, as shown in FIG. 2, 15 frames, one I picture, four P pictures,
And 10 B pictures. G shown in FIG.
In the OP, the first frame is an I picture I (N), and B pictures B _1a (N), B _1b (N), and P
Picture P ₁ (N), B picture B _2a (N), B _2b (N),
P picture P ₂ (N), B picture B _3a (N), B
_3b (N), P picture P ₃ (N), B picture B _4a (N),
B _4b (N), P picture P ₄ (N), B picture B
_5a (N) and B _5b (N). Note that N represents an arbitrary positive integer.

Then, each first track 5 of the optical disc 5
0 is the I picture I of the constituent pictures of the GOP.
(1), I (2),..., I (N),..., I (K) are divided into i equal parts, and the data is transferred from the inner edge of the optical disk 5 to the outer edge of the optical disk 5. It is recorded continuously toward. Note that K indicates the number of GOPs in a series of video sequences. If i = 1, the data divided into i equal parts indicates the I picture itself.

On the other hand, each second track 51 has a picture other than the I picture among the pictures constituting the GOP, ie, a B picture and a P picture nB (1) + mP
(1), nB (2) + mP (2),..., NB (N) + m
Data obtained by dividing P (N),..., NB (K) + mP (K) into j equal parts are continuously recorded from the inner edge of the optical disk 5 toward the outer edge of the optical disk 5. ing. Further, the last position of the I picture on the first track 50 and the last positions of the B picture and the P picture on the second track 51 are substantially the same.

Note that nB (N) + mP (N) means that each GO
2 shows data composed of n B pictures and m P pictures constituting P. For example, in the GOP shown in FIG.
n = 10 and m = 4. When j = 1, the data divided into j equal parts refers to the B picture and the P picture themselves.

I picture I on the first track 50
(1), I (2),..., And I (K) are divided into I-pictures, B-pictures, and P-pictures in the immediately preceding GOP in an area (management data area). Management data (management information) C (1), C (2),..., C (K) including information indicating whether the divided data has been recorded and information on the address of the track on which the divided data is recorded are added.

Management data C (1), C (2),..., C
(K) indicates, for example, a GOP dividing circuit 2 shown in FIG.
4 and recorded on the first track 50 together with the I picture. The management data C
(K) indicates other positions, for example, TOC (Table of
Contents). Further, while the data amount of one GOP is several hundred kilobytes in the example of FIG. 3 to be described later, the data amount of the management data C (K) is about 10 bytes. The increase is negligible.

The management data C (1), C (2),
.., C (K) are used for decoding an I picture, a B picture, and a P picture, such as a GOP combining circuit 34 shown in FIG. Used to combine data with original data.

In the optical disk 5 according to the present invention,
The number i of the first tracks 50 and the number j of the second tracks 51
Can be arbitrarily set according to the ratio between the data length of the I picture and the total data length of the P picture and the B picture, but the number i of the first track 50 and the number j of the second track 51 And the difference between the data length of the I picture and the total data length of the P picture and the B picture is preferably set to be small.

As a result, the data length of the I picture recorded on each first track 50 and the total data length of the P picture and B picture recorded on each second track 51 can be made substantially equal. As a result, the amount of padding data in the first track 50 and the second track 51 can be reduced more reliably, and the use efficiency of the optical disc 5 can be increased.

Here, the GOP in the compressed moving image data is configured as shown in FIG. 2, and the transfer rate of the moving image data is set to 6 Mb.
In the case of ps, the code amount of each picture is shown in FIG.
Shown in In this example, in one GOP, the data length of the I picture is 100 KB, the total data length of the P picture is 37.5 KB, and the total data length of the B picture is 12.5
The ratio of the data length of the I picture to the total data length of the P picture and the B picture is 2:
It is 1.

Therefore, in this case, if the number i of the first track 50 on which the I picture is recorded is two and the number j of the second track 51 on which the B picture and the P picture are recorded is one, Good. Thereby, the first track 50
Can be made to match the ratio of the data length of the I picture to the total data length of the P picture and the B picture.

Note that the ratio of the data length of the I picture to the total data length of the P picture and the B picture changes according to the change in the transfer rate of the moving image data (in other words, the quality of the image). Therefore, the ratio between the number i of the first tracks 50 and the number j of the second tracks 51 is selected according to the transfer rate of the moving image data.

Next, a moving image recording apparatus used for recording compressed moving image data on the optical disk 5 will be described.
In the following description, when it is necessary to distinguish the optical disk 5 on which the compressed moving image data according to the present invention is recorded, the optical disk 5 is simply referred to as an “optical disk 5”, and the optical disk 5 before the compressed moving image data is recorded. Is referred to as “optical disk 5 before recording”.

The moving picture recording apparatus irradiates the i first tracks 50 on the optical disk 5 before recording with the first light beam to record the I picture, and at the same time, records the I picture on the optical disk 5 before recording. The I-picture is recorded by irradiating the j second light beams to the j second tracks 51.

The number i of the first beam and the number j of the second beam in the moving picture recording apparatus are the ratio of the number i of the first track 50 to the number j of the second track 51, and the data length of the I picture. It is desirable to make adjustments so as to be closest to the ratio of the total data length of the P picture and the B picture.

Specifically, for example, the compression ratio is fixed for all the optical disks 5, and the ratio of the data length of the I picture to the total data length of the P picture and the B picture is i _0.
When the number of light beams is fixed to the pair j ₀ , the total number of light beams irradiating the optical disk 5 is set to i ₀ + j _0, and the first track 5
The number of first light beams for recording an I picture at ₀ may be i ₀ , and the number of second light beams for recording a P picture and a B picture on the second track 51 may be j ₀ .

Therefore, as shown in FIG. 3, when the ratio of the data length of the I picture to the total data length of the P picture and the B picture is 2: 1,
In order to record three I-beams on the first track 50, and two P-beams and B-pictures on the second track 51, the total number of light beams to be applied to the first track 50 is three. The number of the second light beams may be one.

On the other hand, when the compression ratio is variable and the ratio of the data length of the I picture to the total data length of the P picture and the B picture fluctuates, the fluctuation range of the ratio of the data length is changed from the upper limit to the lower limit. The maximum number (i + j) _max of light beams that can be irradiated in the moving image recording apparatus is set to a relatively large value so that the ratio between i and j can be made substantially equal for all the values of .

Then, with the change in the compression ratio, that is, the change in the ratio between the data length of the I picture and the total data length of the P picture and the B picture, the number i of the first light beams actually used and the 2 by appropriately adjusting the number j of light beams,
The ratio between i and j is changed. Thereby, it is possible to provide a moving image recording apparatus capable of efficiently recording moving image data on the optical disk 5 corresponding to all compression ratios.

Next, a moving image reproducing apparatus for performing normal reproduction and special reproduction from the optical disk 5 will be described.

At the time of normal reproduction, the moving picture reproducing apparatus performs the first track 50 and the second track 51 on the optical disc 5.
Are simultaneously irradiated with (i + j) light beams to read and reproduce the I picture, the B picture, and the P picture. On the other hand, during the special reproduction, only the first track 50 on the optical disc 5 is irradiated with the i light beams. Then, only the I picture is read and reproduced.

As a result, since only the I picture can be continuously reproduced, high-speed special reproduction without a track jump can be performed.

The above moving picture recording apparatus and moving picture reproducing apparatus will be described in more detail below. In the following description, a moving image recording apparatus and a moving image reproducing apparatus which are configured in the same apparatus in order to share the moving image recording apparatus and the moving image reproducing apparatus will be described as an example. However, the present invention is not limited to this, and each can be applied independently.

In the following description, data obtained by dividing an I picture into two equal parts for two first tracks 50 of the optical disk 5 before recording (hereinafter, these data are referred to as data I ₁ , Data I ₂ ) will be described, and a P picture and a B picture will be recorded on one second track 51 of the optical disk 5 before recording.

The moving image recording / reproducing apparatus according to the present embodiment has the structure shown in FIG.
As shown in (1), a disk drive system, a recording system, and a reproduction system are roughly divided, and these are controlled by the controller 1.

The above-mentioned disk drive system includes a servo control circuit 1
1 and a spindle motor 12 so that the optical disk 5 can be driven.

The recording system includes a seek control circuit 4, an optical head feed motor 6 and an optical head 7, a recording circuit 21, a data modulation circuit 22, an error correction encoding circuit 23, a GOP dividing circuit 24, and a moving picture encoding circuit. 25.

The reproduction system includes a reproduction signal processing circuit 3
1, data demodulation circuit 32, error detection and correction circuit 33, GO
A P synthesizing circuit 34, a moving image decoding circuit 36, a monitor 37, and the like are provided.

Further, as described above, the controller 1 is provided for controlling the
Panel button 3 for inputting instructions such as playback and fast forward
Are provided, and these input signals are transmitted to the controller 1 via the panel control circuit 2 for controlling the panel buttons 3.

The operation of the moving image recording / reproducing apparatus having the above-described configuration when recording a moving image on the optical disk 5 will be described with reference to FIG.

First, the controller 1 controls all functions in the block according to a control procedure stored therein. The panel control circuit 2 converts an input signal 101 from a panel button 3 such as recording / playback / stop / fast-forward into an address port that can be recognized by the controller 1, and outputs a panel command 1
02 is sent.

Next, the controller 1 issues a panel command 1
02, a seek control signal 103 is instructed to the seek control circuit 4. Therefore, when a recording command is issued from the panel button 3, the seek control circuit 4 issues a seek command 104 to control the optical head feed motor 6 and the optical head 7 based on the seek control signal 103. Then, the optical head 7 is positioned on the target first tracks 50 and 50 and the second track 51 of the optical disk 5.

The controller 1 sends a servo control signal 107 to the servo control circuit 11 to
The spindle motor 12 for rotating the
08. Next, the target first track 5
The optical heads 7 positioned at 0.50 and the second track 51 are shifted to the tracking state.

Next, the moving picture encoding circuit 25 responds to the encoding command 114 sent from the controller 1 by, for example, NTSC (National System Committee).
A / D conversion is performed on the video signal of the system or the like, and the moving image is compressed based on MPEG, so that I picture, B picture, and P picture data are output to the GOP dividing circuit 24 for each GOP.

The GOP dividing circuit 24 divides one GOP into pictures, and divides the I picture into the first track 50.
The B picture and the P picture are assigned to the signal j ₁ for the second track 51 and output to the signals i ₁ and i ₂ for 50, respectively. Further, together with the division result, management data C indicating a track to be recorded (one of the first tracks 50 and 50 and the second track 51) is also output.

Next, the error correction encoding circuit 23 receives the signals i _1, i _{2 and} j ₁ , adds an error correction code to each of them, and converts the three modulated data 116 into the data modulation circuit 2.
Send to 2. The data modulation circuit 22 includes the controller 1
Receiving the start-up command 115 from the optical disc 5, the three modulation data 117 are transmitted while adjusting the recording timing at the target address on the optical disc 5.

Next, the recording circuit 21 receives the modulated data 117 and sends respective recording signals 118 to the three semiconductor lasers in the optical head 7 by using the first light beams from the two semiconductor lasers. Data I _{1 and} I ₂ obtained by dividing the I picture into two equal parts are stored in the first tracks 50 and 50.
At the same time, a B picture and a P picture are recorded on the second track 51 by a second light beam from another semiconductor laser.

Thus, for example, when the ratio of the data length of an I picture to the data length of a B picture and a P picture is 2: 1, moving image data is efficiently recorded on the optical disk 5 without adding padding data. can do.

In the optical head 7, the first light beams from the two semiconductor lasers are modulated based on data I _{1 and} I ₂ obtained by dividing an I picture into two equal parts, respectively. The second light beam from one semiconductor laser is
The modulation is performed based on the B picture and the P picture.

Next, the operation at the time of reproducing a moving image will be described with reference to FIG.
It will be described based on. First, when a playback command is issued from the panel button 3, the seek control circuit 4 performs a seek command 104 to control the optical head feed moke 6 and the optical head 7 based on the seek control signal 103. To position the optical disc 5 at the target first tracks 50 and 50 and the second track 51. Further, the controller 1 sends a servo control signal 107 to the servo control circuit 11 to
A spindle motor 12 for rotating the optical disk 5 is controlled through a motor signal 108.

The optical head 7 positioned on the target first track 50/50 and the second track 51 is shifted to the tracking state, and the moving image data recorded on the first track 50/50 and the second track 51 is transferred to the optical head. 7 are converted into electric signals by the photodetector 7, and the respective read signals 112 are sent to the reproduction signal processing circuit 31. The reproduction signal processing circuit 31 converts this signal into a binarized reproduction signal 109.

Next, the controller 1 sends a start signal 110 to the data demodulation circuit 32, and outputs the demodulated signal 111 to the error detection and correction circuit 33 while adjusting the reproduction timing from the target address. Command. Error detecting and correcting circuit 33 detects correct data errors by performing an ECC (Error Checking and Correction) processing by receiving the demodulated signal 111, the corrected three reproduction signals i _1, i _2, j ₁ a GOP combining circuit 34.

The GOP synthesizing circuit 34 divides the I-picture into _two signals i ₁ and i ₂ based on the management data C, and the B-picture and P-picture included in the signal j _1.
The picture and the picture are combined, assembled into one GOP, returned to the original GOP data, and output. The GOP synthesizing circuit 34 has a buffer memory for one GOP.
After storing the data for one unit, the synthesis is started.

The moving picture decoding circuit 36 decompresses the compressed I, P, and B pictures, performs D / A conversion to a video signal of the NTSC system or the like, and outputs it to the monitor 37. Also,
The moving image decoding circuit 36 exchanges control of the transfer start and transfer of the reproduction data 112 with the controller 1 through the control signal 113 so as to perform control so that the moving image can be smoothly displayed on the monitor 37 without interruption.
It is assumed that the video decoding circuit 36 has a minimum necessary buffer memory.

As described above, the data length of the I picture, B
Normal reproduction and high-speed special reproduction of a moving image can be performed from an optical disk on which moving image data having a difference in data length between a picture and a P picture is recorded. Further, since the optical head 7 can be arranged on only one side of the optical disk 5,
The device can be made thinner. Further, since there is no need to store padding data, the capacity of the buffer memory can be reduced, and the memory can be effectively used.

The GOP dividing circuit 24 in FIG. 4 will be described in detail with reference to FIG. GOP dividing circuit 24
5 includes memories 61 to 63, switch circuits 64 and 65, and a management data generation circuit (management data generation means) 66, as shown in FIG.

When recording a moving image, first, the switch circuit 6
5, I, B, and P pictures are input from the moving picture encoding circuit 25 for each GOP. The I, B, and P pictures are data obtained by A / D converting a video signal based on an encoding instruction 114 from the controller 1 in the moving image encoding circuit 25 and compressing the moving image based on MPEG. At the same time, control signals 120 to 122 are sent from the controller 1 to the switch circuits 64 and 65 and the management data generation circuit (management data generation means) 66.

Next, the switch circuit 65 divides the I picture into I ₁ and I ₂ based on the control signal 120, and stores I ₁ in the switch circuit 64, I ₂ in the memory 62,
Each of them is output, and the B and P pictures are
Output to 3.

The management data generation circuit 66 generates management data indicating the relationship between each picture and a recording track at this time based on the control signal 122 sent from the controller 1, and generates the management data C Is output to the switch circuit 64. The management data C is data indicating the recording track address and the sector address of the I picture and the recording track address and the sector address of the B and P pictures.

Further, the switch circuit 64 first stores the I picture I ₁ in the memory 61 based on the control signal 121.
, And then the management data C is output to the memory 61.

As described above, the I picture I ₁ and the management data C are inputted to the memory 61 as the recording signal i ₁ , and the I picture I ₂ is inputted to the memory 62 as the recording signal i ₂
Is input to, B, P pictures are input to the memory 63 as a recording signal j _1. Then, these recording signals i _1,
i _2, j _1, for each GOP, the output is read from the memory 61 to 63.

The GOP synthesizing circuit 34 in FIG. 4 will be described in detail with reference to FIG. GOP dividing circuit 34
As shown in FIG. 6, a management data reproducing circuit (management data reproducing means) 67, memories 68 to 70, and a switch circuit 71 are provided.

At the time of reproducing a moving image, first, the reproduced signal i ₁ is input to the management data reproducing circuit 67 and the memory 68, and the reproduced signal i _2, j ₁ is supplied to the memory 6.
9 and 70, respectively.

[0103] Then, the management data reproducing circuit 67 reproduces the management data C included in the signal i _1, and sends to the controller 1. In the memories 68, 69, and 70, after storing data for one GOP, the I picture I ₁ , the I picture I ₂ , and the B and P pictures are output to the switch circuit 71, respectively.

Further, in the switch circuit 71, based on the control signal 124 from the controller 1, the I picture I
_1, I ₂ and B, P pictures are selected and synthesized, and I, B,
The P picture is sent to the moving picture decoding circuit 36. In the video decoding circuit 36, the control signal 113 from the controller 1
Based on the timing of the compressed video data I,
A moving image is reproduced while expanding B and P pictures.

A method of recording a moving image on the optical disk 5 by the above moving image recording / reproducing apparatus will be described with reference to a flowchart of FIG.

First, for example, a television image of the NTSC system or the like is fetched and subjected to A / D conversion to convert an analog moving image into digital data (S1). Next, the digitized moving image is decomposed into I pictures, P pictures, and B pictures by the MPEG algorithm and data is compressed (S2).

In the compressed moving image data, data I _1,
The I _2, the first track 50, 50 of the optical disk 5, respectively, at the same time towards the inner circumference of the optical disk 5 GOP sequentially toward the outer periphery is recorded (S3), the P and B pictures, the optical disc 5 2 Recording is performed on the track 51 in the order of GOP from the inner circumference toward the outer circumference (S4).

Next, it is determined whether or not one GOP, which is a unit of compression, is completed (S5). If one GOP is completed, the process of S6 is executed. If one GOP is not completed, the process returns to S3.

Finally, it is determined whether or not it is the end of the video sequence which is the whole moving image (S6). If it is the end of the video sequence, the process is terminated. If it is not the end of the video sequence, the process returns to S1. Capture the next hourly video.

With the above method, the ratio of the data length of the I picture to the data length of the B picture and the P picture is 2: 1.
By recording the MPEG compressed moving image data, moving image data having the same data length can be recorded on the first track 50 and the second track 51 of the optical disc 5. Therefore, it is not necessary to add padding data to moving image data having a short data length, so that the use efficiency of the optical disc 5 can be improved.

Next, the control procedure of the normal reproduction and the special reproduction will be described with reference to the flowcharts shown in FIGS. First, normal reproduction will be described with reference to the flowchart shown in FIG. When the normal playback is instructed from the panel button 3, the TOC recorded on the optical disk 5 to indicate the head position of the moving image is read, and the optical head 7 accesses the head GOP of the video sequence (S
7).

Next, in order to execute the normal reproduction operation instructed from the panel button 3, the two first light beams of the three light beams emitted from the light head 7 data I ₁ recorded on the first track 50, _50, to reproduce the I ₂ (S8) at the same time, recorded in the second track 51 by a single second light beam remaining B-pictures and P-pictures Play (S
9).

Next, the end of the GOP is confirmed (S10).
If it is the end of the GOP, the process ends. If it is not the end of the GOP, the process returns to S8 to continue the process.

The above is the normal reproduction process. Next, the case of the special reproduction process will be described with reference to the flowchart of FIG.

First, as shown in FIG. 9, it is assumed that the optical head 7 is positioned at the head of the I picture in the radial direction at a certain point in time as in the normal reproduction processing. In order to execute a special reproduction operation such as fast forward specified by the panel button 3, the first light beam of the three light beams emitted from the light head 7 I picture data I recorded on tracks 50
_1, I ₂ only Play (S11). Here, it is assumed that the remaining one second light beam does not reproduce the data of the B picture and the P picture. Next, the optical head 7 is G
Until the end of the OP is determined (S12), the process returns to S11 to continue the process. When the optical head 7 determines the end of the GOP, the process ends.

In accordance with the processing procedure described above, high-speed special reproduction that does not require unnecessary access such as track jump can be performed.

When the optical disk 5 is a rewritable optical disk such as a magneto-optical disk or a phase change disk, the recording / reproducing is performed by the moving image recording / reproducing apparatus in which the moving image recording apparatus and the moving image reproducing apparatus are combined as described above. Digital video disk device can be constructed. If the optical disk 5 is a read-only optical disk recorded by pits having concavities and convexities previously engraved like a CD,
The recording system (moving image recording device) of the moving image recording / reproducing apparatus described above records an original optical disk first, and can copy an uneven optical disk based on this. And
By playing back the optical disc by the playback system (moving picture playback apparatus) of the above-described moving picture recording / playback apparatus, a playback type digital video disc apparatus can be configured.

[0118]

As described above, in the optical recording medium according to the first aspect of the present invention, the first track on which intra-frame encoded data is continuously recorded and the inter-frame predictive encoded data are continuous. And a second track on which at least one of the intra-frame encoded data and the inter-frame predictive encoded data is divided into a plurality of tracks. This is a configuration that is recorded.

According to the above configuration, at least one of the intra-frame coded data and the inter-frame predicted coded data is recorded by being divided into a plurality of tracks. Even if the ratio between the data length of the encoded data and the data length of the inter-frame predictive encoded data deviates greatly from 1: 1, by increasing or decreasing the number of first tracks and / or the number of second tracks,
By reducing the difference in data length between the tracks, the amount of padding data on the tracks of the recording medium can be reduced.
As a result, it is possible to provide an optical recording medium on which compressed moving image data is efficiently recorded.

Further, according to the above configuration, one recording surface,
For example, a first track and a second track can be provided only on one surface of an optical disc, and a smaller moving image reproducing apparatus is usually used as compared with a case where the first track and the second track are provided on different recording surfaces. There is also an effect that reproduction and special reproduction become possible.

The optical recording medium according to claim 2 of the present invention
As described above, in the optical recording medium according to claim 1, the number of the first tracks and the number of the second tracks are equal to the ratio of the number of the first tracks to the number of the second tracks, and Is set so that the difference between the ratio of the total data length and the ratio of the total data length of the inter-frame prediction encoded data becomes small.

Thus, even if the compression ratio of the image changes due to the change in the compression ratio, the ratio between the data length of the intra-frame coded data and the data length of the inter-frame prediction coded data is increased from 1: 1. Even if the data deviates, the difference in data length between the tracks can be reduced, and the amount of padding data in the tracks of the recording medium can be reduced more reliably. As a result, it is possible to provide an optical recording medium on which compressed moving image data is recorded more efficiently.

The optical recording medium according to claim 3 of the present invention
As described above, in the optical recording medium according to claim 1, the management data for managing the relationship between the intra-frame coded data and the inter-frame predicted coded data and the first track and the second track. Is recorded in the management data area.

According to the above configuration, the intra-frame coded data and the inter-frame predictive coded data are respectively determined by the management data recorded in the management data area.
By confirming in which sector of the track and the second track the data is recorded, it is possible to reproduce a moving image while accurately expanding the compressed moving image data.

As described above, the moving picture recording apparatus according to the fourth aspect of the present invention is characterized in that the interframe predictive coded data including the unidirectional interframe predictive coded data and the bidirectional interframe predictive coded data, A moving image recording apparatus for recording compressed moving image data including inner encoded data on an optical recording medium, wherein the intra-frame predictive encoded data is recorded on an optical recording medium having a recording surface provided with a plurality of tracks. And a second light beam for recording inter-frame predictive encoded data are simultaneously radiated to different positions on the recording surface, and the intra-frame encoded data is transmitted to the first light beam. At the same time as the number of the first tracks, and simultaneously, the inter-frame prediction coded data is continuously recorded on the second track of the number equal to the number of the second light beams. , At least one of the predictive coded data inter-frame coding data and the frame, is configured to record in a plurality of tracks.

According to the above arrangement, by increasing or decreasing the number of first light beams and / or the number of second light beams, the difference in the data length of each track of the optical recording medium is reduced, and the padding data is reduced. Can be reduced. As a result, there is an effect that more efficient recording can be performed on the optical recording medium. Further, according to the above configuration, since image data can be recorded only on one recording surface of the optical recording medium, the size of the apparatus can be reduced.

As described above, the moving picture recording apparatus according to claim 5 of the present invention is the moving picture recording apparatus according to claim 4, wherein the intra-frame coded data and the inter-frame predicted coded data and the first track And management data generating means for generating management data for managing the relationship with the second track, wherein the management data is recorded on an optical recording medium together with intra-frame encoded data and inter-frame predictive encoded data. is there.

According to the above configuration, the management data generated by the management data generating means can be recorded on the optical recording medium together with the intra-frame coded data and the inter-frame prediction coded data. With this, depending on the management data,
By confirming which first track and which sector of the second track each record the intra-frame encoded data and the inter-frame predictive encoded data, the compressed moving image data can be accurately expanded. There is an effect that an optical recording medium capable of reproducing a moving image can be obtained.

A moving image reproducing apparatus according to a sixth aspect of the present invention is a moving image reproducing apparatus for reproducing a moving image from the optical recording medium according to the first aspect, wherein the first track of the optical recording medium is provided. And irradiating the second track with the same number of light beams as the sum of the number of the first track and the number of the second track to simultaneously read and read the intra-frame encoded data and the inter-frame predictive encoded data. Normal reproduction is performed based on the output intra-frame encoded data and inter-frame predictive encoded data, and the first track of the optical recording medium is irradiated with the same number of light beams as the number of the first tracks. In this configuration, the intra-frame coded data is read, and special reproduction is performed based on the read intra-frame coded data.

According to the above configuration, the first track and the second track of the optical recording medium can be irradiated with the light beam to continuously reproduce only the intra-frame encoded data. There is an effect that an image reproducing apparatus capable of reproducing can be provided. In addition, the moving image can be normally played back and specially played back from only one recording surface of the optical recording medium, so that the effect of reducing the size of the apparatus can be achieved.

As described above, the moving picture reproducing apparatus according to claim 7 of the present invention is the moving picture reproducing apparatus according to claim 6, wherein the intra-frame coded data and the inter-frame predictive coded data and the first track And management data reproducing means for reproducing management data for managing the relationship with the second track. The intra-frame coded data and the inter-frame predictive coded data recorded on the first track and the second track are provided. The demodulation is performed based on the management data.

According to the above configuration, the intra-frame coded data and the inter-frame predicted coded data are demodulated based on the management data reproduced by the management data reproducing means.
Therefore, it is possible to accurately decompress the compressed moving image data by confirming which first track and which sector of the second track each record the intra-frame encoded data and the inter-frame predictive encoded data. This has the effect that a moving image can be played back while playing.

[Brief description of the drawings]

FIG. 1 is a configuration diagram of a recording data area of an optical disc according to the present invention.

FIG. 2 is a diagram showing a picture configuration of a GOP in MPEG.

FIG. 3 is a diagram illustrating a code amount of each picture of a GOP in MPEG.

FIG. 4 is a block diagram of a moving image recording / reproducing device as a moving image recording device and a moving image reproducing device according to the present invention.

FIG. 5 is a block diagram showing a configuration of a GOP dividing circuit in FIG. 4;

FIG. 6 is a block diagram showing a configuration of a GOP synthesizing circuit in FIG. 4;

FIG. 7 is a flowchart showing a procedure for recording compressed moving image data on an optical disk in the moving image recording apparatus according to the present invention.

FIG. 8 is a flowchart showing a procedure for normally reproducing a moving image from an optical disk in the moving image reproducing apparatus according to the present invention.

FIG. 9 is a flowchart showing a procedure for specially reproducing a moving image from an optical disc in the moving image reproducing apparatus according to the present invention.

FIG. 10 is a configuration diagram of a recording data area of an optical disc in a conventional example.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 controller 2 panel control circuit 3 operation panel 4 seek control circuit 5 optical disk (optical recording medium) 6 feed motor for optical head 7 optical head 11 servo control circuit 12 spindle motor 21 recording circuit 22 data modulation circuit 23 error correction code Circuit 24 GOP division circuit 25 video encoding circuit 31 reproduction signal processing circuit 32 data demodulation circuit 33 error detection and correction circuit 34 GOP synthesis circuit 36 video decoding circuit 37 monitor 50 first track 51 second track 66 management data generation circuit (management data Generation means) 67 Management data reproduction circuit (Management data reproduction means)

Claims (7)

[Claims] An optical recording medium for recording compressed moving image data including inter-frame predictive encoded data comprising unidirectional inter-frame predictive encoded data and bidirectional inter-frame predictive encoded data, and intra-frame encoded data. Having a recording surface provided with a first track on which intra-frame encoded data is continuously recorded and a second track on which inter-frame predictive encoded data is continuously recorded; An optical recording medium characterized in that at least one of intra-frame encoded data and inter-frame predictive encoded data is divided into a plurality of tracks and recorded on the track and the second track. 2. The method according to claim 1, wherein the number of first tracks and the number of second tracks are the ratio of the number of first tracks to the number of second tracks, the total data length of the intra-frame encoded data, and the inter-frame predictive encoding. 2. The optical recording medium according to claim 1, wherein a difference between the data and a ratio to a total data length is set to be small. 3. A management data area for recording management data for managing the relationship between the intra-frame coded data and the inter-frame predicted coded data, and the first track and the second track. The optical recording medium according to claim 1. 4. Compressed moving image data including inter-frame predictive encoded data comprising unidirectional inter-frame predictive encoded data and bidirectional inter-frame predictive encoded data, and intra-frame encoded data is recorded on an optical recording medium. A moving image recording apparatus, comprising: a first light beam for recording intra-frame prediction encoded data and an inter-frame prediction encoded data on an optical recording medium having a recording surface provided with a plurality of tracks. And simultaneously irradiating a different position on the recording surface with the second light beam to record the intra-frame coded data on the first track having the same number as the first light beam. The inter-frame prediction coded data is continuously recorded on the second tracks of the same number as the number of the second light beams, and the intra-frame coded data and the inter-frame prediction coded data are recorded. At least one of data, moving image recording apparatus and recording in a plurality of tracks. 5. A management data generating means for generating management data for managing a relationship between intra-frame coded data and inter-frame prediction coded data, and the first track and the second track, wherein the management data 5. The moving image recording apparatus according to claim 4, wherein the data is recorded on the optical recording medium together with the intra-frame encoded data and the inter-frame prediction encoded data. 6. A moving image reproducing apparatus for reproducing a moving image from an optical recording medium according to claim 1, wherein the number of first tracks and the number of second tracks are relative to the first and second tracks of the optical recording medium. Irradiating the same number of light beams as the total number of light beams to simultaneously read intra-frame encoded data and inter-frame prediction encoded data, and based on the read intra-frame encoded data and inter-frame predicted encoded data, Normal reproduction is performed by irradiating the first track of the optical recording medium with the same number of light beams as the number of the first tracks to read the intra-frame encoded data. A moving image reproducing apparatus that performs special reproduction based on a video. 7. A management data reproducing means for reproducing management data for managing the relationship between the intra-frame encoded data and the inter-frame predictive encoded data and the first track and the second track, and 7. The moving picture reproducing apparatus according to claim 6, wherein the intra-frame coded data and the inter-frame predicted coded data recorded on the first track and the second track are demodulated based on the management data.