JP2001344873A - Disk reproducing device and disk reproducing method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a disk reproducing device and disk reproducing method which can make handling of a disk convenient for a user by making it possible to automatically change the kinds of auxiliary video streams by each of prescribed units. SOLUTION: The disk reproducing device and disk reproducing method for reproducing the disk recorded with main videos and plural kinds of the auxiliary videos corresponding to the main videos are so constituted that >=2 kinds of the auxiliary videos are assigned from plural kinds of the auxiliary videos and that >=2 kinds of the assigned auxiliary videos are automatically changed by each of the prescribed reproducing units.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention
(Digital Versatile Disc) The present invention relates to a disc reproducing apparatus and a disc reproducing method suitable for reproducing an optical disc such as a video.

[0002]

2. Description of the Related Art As is well known, video (video)
A drive system has been developed to play back optical discs that have recorded audio, audio, etc. For the purpose of playing back various kinds of software such as movies, music or karaoke, such as optical discs such as LD (Laser Disc) or video CD (Compact Disc). Is widespread.

[0003] In recent years, MPEG (Moving Picture Image Coding Exper-
ts Group) 2 system, AC (Digi)
talAudio Compression) -3 and linear PCM (Pulse Co
de Modulation) and other audio compression methods
The VD standard has been proposed.

The DVD standard includes a read-only D
VD video [or DVD-ROM (Read Only Memor
y)], write-once DVD-R (Recordable), DVD-RAM (Random Access Memory)
ry) [or DVD-RW (ReWritable)].

[0005] Among them, DVD video (or DVD-
ROM) standard supports MPEG2 as a moving image compression method according to the MPEG2 system layer,
As an audio recording method, AC-3 audio and MPEG audio are supported in addition to linear PCM.

[0006] Further, the DVD video standard includes sub-picture data obtained by run-length-compressing bitmap data for subtitles, and control data (navigation data) for reproduction control for data search such as fast-forward reproduction and fast-reverse reproduction. And it is configured by adding.

[0007] Further, according to the DVD video standard, an IS standard is used so that data can be read by a computer.
O (International Organization for Standardizatio
n) It also supports 9660 and UDF (Universal Disc Format) bridge formats.

The DVD video (DVD-RO)
Currently, the optical disk (DVD-ROM disk) used for M) has a diameter of 12 cm on one side and a layer of 12 cm when a laser beam having a wavelength of 650 nm is used for reading, and records about 4.7 GB (GigaBytes). Have the capacity.

When an optical disk having the same diameter of 12 cm is used for reading a laser beam of the same wavelength, it has a single-sided, two-layered structure, has a recording capacity of about 9.5 GB, and has a double-sided, two-layered structure. In this case, large-capacity recording of about 18 GB is possible.

As described above, since the recording capacity is enormous and the digital information is used, the subtitles based on the sub-picture data can be up to 3 captions.
In addition to being able to include two types of languages, the audio can include up to eight types of languages, and each of them can be selectively switched and reproduced by a user operation.

[0011]

As described above, the DVD
Video standard optical discs use sub-picture data to
Up to 32 types of selectable subtitles can be recorded. These subtitles can be selectively switched and displayed by a user's remote control operation or the like.

However, for example, by learning a language, a series of video scenes are viewed in Japanese subtitles, and then the same video scene is viewed in English subtitles. However, when performing reproduction, it is necessary to perform a remote control operation every time the subtitles are switched, and there is a problem that handling is inconvenient for the user.

Therefore, the present invention has been made in view of the above circumstances, and it is possible to automatically switch the type of sub-picture stream for each predetermined unit, thereby making the handling for the user very convenient. An object of the present invention is to provide a good disk reproducing apparatus and a good disk reproducing method.

[0014]

SUMMARY OF THE INVENTION A disk reproducing apparatus according to the present invention is intended to reproduce a disk on which a main video and a plurality of types of sub-videos corresponding to the main video are recorded. A designating means for designating two or more types of sub-pictures from a plurality of types of sub-pictures, and the two or more kinds of sub-pictures designated by the designating means are automatically and sequentially switched for each predetermined reproduction unit and reproduced. And a reproduction control means.

A disk reproducing method according to the present invention is intended for reproducing a disk on which a main video and a plurality of types of sub-videos corresponding to the main video are recorded. Then, a designation step of designating two or more kinds of sub-pictures from the plurality of kinds of sub-pictures, and the two or more kinds of sub-pictures designated in the designation step are automatically and sequentially switched and reproduced in predetermined reproduction units. This is through a reproduction control step.

According to the above configuration and method, the type of the sub-picture stream can be automatically switched for each predetermined reproduction unit, so that the user can easily handle the sub-picture stream.

A disk reproducing apparatus according to the present invention is intended for reproducing a disk on which a main video and a plurality of types of sub-videos corresponding to the main video are recorded. Then, a designating means for designating a predetermined sub-picture from a plurality of types of sub-pictures, and a sub-picture designated by the designating means,
A reproduction control means for automatically switching between a display state and a non-display state for each predetermined reproduction unit for reproduction is provided.

Further, a disk reproducing method according to the present invention is intended for reproducing a disk on which a main video and a plurality of types of sub-videos corresponding to the main video are recorded. Then, a designation step of designating a predetermined sub-picture from a plurality of types of sub-pictures, and a sub-picture designated in the designation step,
A reproduction control step of automatically switching between a display state and a non-display state for each predetermined reproduction unit for reproduction is performed.

According to the configuration and method as described above, the sub-picture can be automatically switched between the display state and the non-display state and reproduced for each predetermined reproduction unit.
Handling for the user can be made convenient.

Further, a disk reproducing apparatus according to the present invention is intended for reproducing a disk on which a main video and a plurality of types of sub-videos corresponding to the main video are recorded. Then, a designating means for designating a predetermined sub-picture from a plurality of types of sub-pictures, and a sub-picture designated by the designating means,
A reproduction control means for automatically switching and reproducing contrast for each predetermined reproduction unit.

Further, a disk reproducing method according to the present invention is intended for reproducing a disk on which a main video and a plurality of types of sub-videos corresponding to the main video are recorded. Then, a designation step of designating a predetermined sub-picture from a plurality of types of sub-pictures, and a sub-picture designated in the designation step,
And a reproduction control step of automatically switching and reproducing contrast for each predetermined reproduction unit.

According to the above-described configuration and method, the contrast of the sub-picture can be automatically switched and reproduced for each predetermined reproduction unit, so that the user can easily handle the picture. it can.

[0023]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a first embodiment of the present invention will be described in detail with reference to the drawings. FIG. 1 schematically shows a disk recording / reproducing apparatus to which the present invention is applied. This disc recording / reproducing device is composed of
This is for writing and reading data to and from the optical disc 11 on which audio data and sub-picture data can be rewritten.

That is, this disk recording / reproducing apparatus
Mainly, the optical disk 11 is driven to rotate, and the objective lens 1 is rotated.
A disk drive unit 12 for writing and reading information to and from the optical disk 11 by an optical head 12b having an optical head 12a;
And a decoder unit 14 constituting a reproduction processing system, and an MPU (Micro Processing Unit) unit 15 for controlling the operation of the entire apparatus.

The encoder section 13 includes an A / D
(Analog / Digital) converter 13a, video encoder 13b, audio encoder 13c, SP
(SubPicture) An encoding unit 13d, a formatter unit 13e, and a buffer memory unit 13f are provided.

The A / D conversion section 13a includes A
/ V (Audio / Video) input unit 16 and external analog video signal + external analog audio signal or TV
(Television) An analog TV signal + analog audio signal from the tuner unit 17 is input.

The A / D converter 13a converts the input analog video signal into a signal having a sampling frequency of 13.
Digitization is performed at 8 MHz and a quantization bit number of 8 bits.
That is, the luminance component Y and the color difference signal Cr (or YR)
And the color difference signal Cb (or YB) are quantized with 8 bits each. Similarly, the A / D converter 13a digitizes the input analog audio signal at, for example, a sampling frequency of 48 MHz and a quantization bit number of 16 bits.

When an analog video signal and a digital audio signal are input to the A / D converter 13a, the A / D converter 13a passes the digital audio signal through. In this case, a process of reducing only the jitter accompanying the digital signal or a process of changing the sampling rate or the number of quantization bits without changing the content of the digital audio signal may be performed.

When a digital video signal and a digital audio signal are input to the A / D converter 13a, the A / D converter 13a passes through the digital video signal and the digital audio signal. Jitter reduction processing and sampling rate change processing may be performed on these digital signals without altering the content.

The digital video signal component from the A / D converter 13a is sent to a formatter 13e via a video encoder 13b. A / D converter 1
The digital audio signal component from 3a is sent to the formatter unit 13e via the audio encoding unit 13c.

The video encoder 13b converts the input digital video signal into MPEG2 or MPEG2.
It has a function of converting into a digital signal compressed at a variable bit rate based on one standard. The audio encoding unit 13c has a function of converting an input digital audio signal into a digital signal (or a linear PCM digital signal) compressed at a fixed bit rate based on the MPEG or AC-3 standard. I have.

When video information is input from the A / V input unit 16 (for example, when a signal is input from a DVD video player or the like having an independent output terminal for a sub video signal), or a DVD video having such a data structure When a signal is broadcast and received by the TV tuner unit 17,
The sub video signal component in the DVD video signal is input to the SP encoder 13d. This SP encoding unit 13d
Are arranged in a predetermined signal form and sent to the formatter unit 13e.

The formatter section 13e performs predetermined signal processing on the input video signal, audio signal, sub-picture signal and the like while using the buffer memory section 13f as a work area, and conforms to a predetermined file structure. The generated recording data is generated and output to the data processor 18.

Here, the disk drive section 12 includes a data processor section 18, a disk changer section 19, a temporary storage section 20, and an STC (System Time Cloc).
k) section 21 is connected.

Then, the data processor unit 18
Based on the control of the U unit 15, the D
The VD recording data is recorded on the optical disk 11 via the disk drive unit 12, and the data recorded on the optical disk 11 is read via the disk drive unit 12 and output to the decoder unit 14. The data processor unit 18 can also rewrite management information recorded on the optical disk 11, delete recorded data, and the like.

On the other hand, the decoder section 14 includes a separating section 14a for separating the data from the data processor section 18 into a main picture, a sub-picture, and an audio component.
A video decoding unit 14b for decoding the main video data separated by the above, an SP decoding unit 14c for decoding the sub-video data separated by the separation unit 14a, and a separation unit 14a
An audio decoding unit 14d for decoding the audio data separated by the above, a video processor unit 14e for appropriately combining the main video data from the video decoding unit 14b with the sub video data from the SP decoding unit 14c, and a video processor unit 14e. D / A (Digital / Analo) that converts the digital video output of the
g) A conversion unit 14f and a D / A conversion unit 14g for converting a digital audio output from the audio decoding unit 14d into an analog audio signal.

The analog video signal from the D / A converter 14f and the analog audio signal from the D / A converter 14g are supplied to an external component (not shown) (not shown) via the A / V output unit 22. Multi-channel stereo device + monitor TV or projector).

The MPU unit 15 includes an STC unit 21
Disk drive unit 1 based on the time data from
2. It controls the encoder 13, the decoder 14, the data processor 18, and the disc changer 19. The contents to be notified to the user among the control results of the MPU unit 15 are displayed on the display unit 23.

Here, FIG. 2 (a) shows the above D
The video file structure in the VD video standard,
4 shows a file structure of data supplied from the data processor unit 18 to the separation unit 14a. This has a hierarchical structure, and one video object set VOBS
Is one or more video objects VOB_ID
N1 to VOB_IDNi.

One video object is composed of one or a plurality of cells C_IDN1 to C_IDNj. Further, one cell is constituted by one or a plurality of video object units VOBU.

One video object unit is composed of one navigation pack NV_PCK and one navigation pack NV_PCK.
One or more audio packs A_PCK and one or more video packs V_PCK as a main video unit
And one or more sub-picture packs S as sub-picture units
P_PCK.

Each pack is composed of one or more packets and a packet header. This pack
This is the minimum unit for performing data transfer processing. The minimum unit for performing logical processing is a cell.

Here, in the decoder section 14, the sub-picture data separated by the separation section 14a and transferred to the SP decoding section 14c has a data configuration as shown in FIG. 2B. In other words, the sub-picture data is composed of a unit of data that is decoded within a certain time, and a PTS (Presen) indicating the time at which the sub-picture data of the unit is decoded is placed at the head of each unit.
tation Time Stamp).

The operation of the above configuration will be described below with reference to the flowchart shown in FIG.
First, when it is started (step S1), the MPU unit 15
In step S2, the relationship between the PTS and a timer (not shown) provided in the disc recording / reproducing apparatus
The video object unit N to be decoded is determined.

Thereafter, the MPU unit 15 determines in step S3
It is determined whether or not a plurality of sub-pictures are specified, and when it is determined that a plurality of sub-pictures are not specified (N
O) In step S4, the designated sub-picture is reproduced,
The process returns to step S2. If it is determined in step S3 that a plurality of sub-pictures have been designated (YE
S), the MPU unit 15 determines in step S5 that the unit N
, The display start time of the first designated sub-picture is stored, and the first designated sub-picture of the unit N is displayed in step S6.

Next, the MPU unit 15 determines in step S7
It is determined whether or not the display end time of the first designated sub-video of the unit N has passed, and if it has not passed (NO), the process proceeds to step S4 and the display is continued. If it is determined in step S7 that the display end time of the first designated sub-video of the unit N has passed (Y
ES), the MPU unit 15 searches for the display start position of the unit N on the optical disc 11 in step S8. That is, the objective lens 12a is returned to the display start position of the unit N.

Thereafter, the MPU unit 15 proceeds to step S9
Then, the second designated sub-picture is selected, and in step S10, the second designated sub-picture of the unit N is displayed without switching between the main picture and the audio. Then, in step S11, the MPU unit 15 determines whether or not the display end time of the second designated sub-picture of the unit N has passed. If it is determined that the time has not passed (NO), the MPU unit 15 proceeds to step S10. Move to processing and continue display.

In step S11, the second unit N
If it is determined that the display end time of the designated sub-video has passed (YES), the MPU unit 15 determines in step S12
The unit number N is incremented by one, and the process returns to step S2. Thereafter, the above sequence is repeated to perform reproduction.

According to the first embodiment, the first designated sub-picture and the second designated sub-picture can be automatically and alternately switched and displayed for each unit. Thus, the handling for the user can be made convenient.

For this reason, for example, as shown in FIG. 4, a series of video scenes are viewed in Japanese subtitles, the same video scene is viewed in English subtitles, and then the next video scene is transferred. In addition, reproduction can be performed while automatically switching between Japanese subtitles and English subtitles, and handling becomes convenient for the user.

FIG. 5 shows a modification of the first embodiment. That is, in FIG. 5, the same steps as those in FIG.
After displaying the first designated sub-picture of the unit N in step 6, the MPU unit 15 determines in step S13 that the unit N +
It is determined whether the display start time of the first first specified sub-picture has passed.

If it is determined that the time has not passed (NO), the process proceeds to step S4, and the display of the first designated sub-picture of the unit N is continued. Step S
If it is determined in 13 that the display start time of the first designated sub-picture of the unit N + 1 has passed (YES), the MPU unit 15 searches the display start position of the unit N on the optical disc 11 in step S8. .

According to the above-described modified example, the same operation as in the first embodiment can be performed, and the same effect can be obtained.

Next, a second embodiment of the present invention will be described with reference to the flowchart shown in FIG. In the first embodiment, the playback unit of the sub-picture is fixed at one unit. However, in the second embodiment, the user can specify the number of playback units.

First, when started (step S21),
In step S22, the MPU unit 15 determines the video object unit N to be decoded based on the relationship between the PTS and a timer (not shown) provided in the disc recording / reproducing apparatus.

Thereafter, the MPU unit 15 determines in step S23
It is determined whether or not a plurality of sub-pictures are specified, and when it is determined that a plurality of sub-pictures are not specified (N
O) In step S24, the designated sub-picture is reproduced, and the process returns to step S22.

If it is determined in step S23 that a plurality of sub-pictures have been designated (YES), the MPU unit 1
5 is the number of reproduction units M specified in step S25.
Is read, and in step S26, the display start time of the first designated sub-picture of the unit N is stored, and the process proceeds to step S27.
Displays the first designated sub-picture of the unit N.

Next, the MPU unit 15 determines in step S28
Then, it is determined whether or not the display end time of the first designated sub-video of the unit N + M has passed. If it is determined that the time has not passed (NO), the process proceeds to step S24 to continue the display. That is, if the number is equal to or less than the designated number of playback units, the playback of the first designated sub-picture of the next unit is continuously executed.

If it is determined in step S28 that the display end time of the first designated sub-picture of the unit N + M has passed (YES), the MPU unit 15 proceeds to step S29.
To search the display start position of the unit N on the optical disk 11.

Thereafter, the MPU unit 15 determines in step S30
Then, the second designated sub-picture is selected, and in step S31, the second designated sub-picture of the unit N is displayed without switching between the main picture and the audio. Then, in step S32, the MPU unit 15 determines whether or not the display end time of the second designated sub-video of the unit N + M has passed. If it is determined that the time has not passed (NO), the process proceeds to step S31. The process shifts to processing, and the display of the second designated sub-video is continued.

If it is determined in step S32 that the display end time of the second designated sub-picture of the unit N + M has passed (YES), the MPU unit 15 proceeds to step S33.
Then, the unit number N is incremented by + M, and the process returns to the step S22. Thereafter, the above sequence is repeated and the reproduction is performed.

According to the second embodiment, the first designated sub-picture and the second designated sub-picture can be automatically and alternately switched and displayed for every M units. Therefore, handling for the user can be made convenient.

In the above-described first and second embodiments, the description has been given of the case where two types of sub-pictures are designated and automatically switched alternately. However, the number of designated sub-pictures is not limited to two, and for example, It is also possible to specify three or more types of sub-pictures and automatically switch them cyclically.

Next, a third embodiment of the present invention will be described with reference to a flowchart shown in FIG. In the third embodiment, when one type of sub-picture is designated, the display of the designated sub-picture is turned on / off, so that, for example, the designated sub-picture is displayed in the first reproduction, In the second reproduction, the designated sub-picture can be hidden.

First, when started (step S41),
In step S42, the MPU unit 15 determines a video object unit N to be decoded based on the relationship between the PTS and a timer (not shown) provided in the disc recording / reproducing apparatus.

Thereafter, the MPU unit 15 determines in step S43
It is determined whether or not ON / OFF designation has been performed for one type of designated sub-picture. If it is determined that ON / OFF designation has not been made (NO), the designated sub-picture is determined in step S44. The content is reproduced, and the process returns to step S42.

If it is determined in step S43 that the designated sub-picture has been designated as ON or OFF (YE
S), the MPU unit 15 determines in step S45 that the unit N
Of the designated sub-picture is stored in step S4.
At 6, the designated sub-picture of unit N is displayed.

Next, the MPU unit 15 determines in step S47
Then, it is determined whether or not the display end time of the designated sub-video of the unit N has passed. If it is determined that the time has not passed (NO), the process proceeds to step S44 and the display is continued. If it is determined in step S47 that the display end time of the designated sub-picture of the unit N has passed (YE
S), the MPU unit 15 searches for the display start position of the unit N on the optical disc 11 in step S48.

Thereafter, the MPU unit 15 determines in step S49
Thus, the designated sub-video of the unit N is displayed without switching between the main video and the audio. Then, in step S50, the MPU unit 15 determines whether or not the display end time of the designated sub-video of the unit N has passed, and when it is determined that the time has not passed (NO), the processing shifts to step S49. And continue the display.

If it is determined in step S50 that the display end time of the designated sub-picture of the unit N has passed (YES), the MPU unit 15 increments the unit number N by one in step S51, and proceeds to step S42. Then, the above sequence is repeated and reproduction is performed.

According to the third embodiment, the display and non-display of the designated sub-picture can be automatically and alternately switched for each unit, so that the handling for the user is convenient. can do.

Next, a fourth embodiment of the present invention will be described with reference to the flowchart shown in FIG. In the fourth embodiment, when one type of sub-picture is designated, the designated sub-picture is displayed at normal contrast in the first reproduction by designating the contrast of the designated sub-picture. In the second reproduction, the contrast of the designated sub-picture is reduced to, for example, 50% so that it can be displayed.

First, when started (step S61),
In step S62, the MPU unit 15 determines the video object unit N to be decoded based on the relationship between the PTS and a timer (not shown) provided in the disc recording / reproducing apparatus.

Thereafter, the MPU unit 15 determines in step S63
Then, it is determined whether or not the contrast control number n is designated for one type of designated sub-picture, and if it is not designated (NO), the designated sub-picture is reproduced in step S64. , And returns to the process of step S62.

If it is determined in step S63 that the number n of contrast controls for the designated sub-picture has been designated (YES), the MPU unit 15 proceeds to step S6.
At 5, the display start time of the designated sub-picture of the unit N is stored, and at step S66, the designated sub-picture of the unit N is displayed.

Next, the MPU unit 15 determines in step S67
Then, it is determined whether or not the display end time of the designated sub-video of the unit N has passed. If it is determined that the time has not passed (NO), the process proceeds to step S64 to continue the display. If it is determined in step S67 that the display end time of the designated sub-picture of the unit N has passed (YE
S), the MPU unit 15 searches for the display start position of the unit N on the optical disc 11 in step S68.

Thereafter, the MPU unit 15 determines in step S69
Thus, the designated sub-video of the unit N is displayed with its contrast reduced to, for example, 50% without switching between the main video and the audio. Then, the MPU unit 15 determines in step S70
Then, it waits until the display end time of the designated sub-picture of the unit N has passed, and in a step S71, it is determined whether or not the contrast control for the designated sub-picture of the unit N has been repeated by the number of repetitions n.

Here, when it is determined that the repetition has not been performed (NO), the MPU unit 15 returns to the processing of step S68 to repeatedly reproduce the same portion, and when it is determined that the repetition is performed (YES), In step S72, the unit number N is incremented by one, and the process returns to step S62. Thereafter, the above sequence is repeated to perform reproduction.

According to the above-described fourth embodiment, it is possible to automatically and alternately switch between a normal designated sub-picture of contrast and a designated sub-picture of controlled contrast for each unit. Thus, the handling for the user can be made convenient.

In the third and fourth embodiments described above, a case has been described where the unit of reproduction of the designated sub-picture is one unit. However, the unit of reproduction of the sub-picture is not limited to one unit, As described in the embodiment, the user may be allowed to specify the number M of reproduction units.

In the first to third embodiments described above, the type of sub-picture is automatically switched for each unit or a plurality of units. However, for example, in a content in which a plurality of types of audio streams exist, Similarly, it is possible to automatically switch the type of the audio stream for each predetermined unit.

The present invention is not limited to the above-described embodiments, but can be implemented with various modifications without departing from the scope of the invention.

[0083]

As described in detail above, according to the present invention,
By making it possible to automatically switch the type of sub-picture stream for each predetermined unit, it is possible to provide a very good disc reproducing apparatus and a very good disc reproducing method that can make the handling of the user convenient.

[Brief description of the drawings]

FIG. 1 is a block diagram for explaining a first embodiment of the present invention;

FIG. 2 is an exemplary view for explaining a video file structure and a data structure of a sub-picture according to the first embodiment;

FIG. 3 is a flowchart shown to explain an operation in the first embodiment.

FIG. 4 is an exemplary view for explaining how two types of sub-pictures are alternately reproduced in the first embodiment;

FIG. 5 is a flowchart for explaining a modification of the first embodiment;

FIG. 6 is a flowchart shown to explain a second embodiment of the present invention.

FIG. 7 is a flowchart for explaining a third embodiment of the present invention;

FIG. 8 is a flowchart shown to explain a fourth embodiment of the present invention.

[Explanation of symbols]

 11 optical disk, 12 disk drive unit, 13 encoder unit, 14 decoder unit, 15 MPU unit, 16 A / V input unit, 17 TV tuner unit, 18 data processor unit, 19 disk changer unit Reference numeral 20: temporary storage unit 21: STC unit 22: A / V output unit 23: display unit

Continued on the front page F term (reference) 5C052 AA03 AB05 AC01 AC08 CC11 DD04 5C053 FA24 GA11 GB12 GB37 HA13 HA18 HA29 JA18 KA04 KA21 KA24 LA06 5D044 BC03 CC06 DE03 DE12 DE17 DE23 DE29 DE38 FG18 5D110 AA15 AA27 DC08 DB06

Claims (10)

[Claims] 1. A disc reproducing apparatus for reproducing a disc in which a main video and a plurality of types of sub-videos corresponding to the main video are recorded, two or more types of sub-videos are designated from the plurality of types of sub-videos. A disc reproducing apparatus comprising: designating means; and reproduction control means for automatically switching and reproducing two or more types of sub-videos designated by the designating means in a predetermined reproduction unit. . 2. The reproduction control means reproduces the designated one type of sub-picture up to its reproduction end position,
2. The disk reproducing apparatus according to claim 1, wherein a reproduction start position of a sub-video to be reproduced next is searched. 3. The playback control unit according to claim 1, wherein the playback control unit is configured to play back the designated one of the sub-pictures up to a playback start location of a sub-picture belonging to a next playback unit, and to start playback of a sub-picture to be played back next. 2. The disc reproducing apparatus according to claim 1, wherein the disc is searched for. 4. A disc reproducing apparatus for reproducing a disc on which a main picture and a plurality of kinds of sub-pictures corresponding to the main picture are recorded, a designation means for designating a predetermined sub-picture from the plurality of kinds of sub-pictures. And playback control means for automatically switching the sub-video designated by the designation means between a display state and a non-display state for each predetermined reproduction unit and reproducing the sub-picture. apparatus. 5. A disc reproducing apparatus for reproducing a disc on which a main video and a plurality of types of sub-videos corresponding to the main video are recorded, a designating means for specifying a predetermined sub-video from the plurality of types of sub-videos And a reproduction control means for reproducing the sub-video designated by the designation means by automatically switching the contrast for each predetermined reproduction unit. 6. The predetermined reproduction unit includes one or a plurality of main video units composed of a predetermined amount of main video data and one or a plurality of sub video units composed of a predetermined amount of sub-video data. 6. The disc reproducing apparatus according to claim 1, wherein the disc reproducing apparatus comprises a plurality of continuous units. 7. A file structure in which a predetermined reproduction unit is composed of one or a plurality of main video units composed of a predetermined amount of main video data and one or a plurality of sub video units composed of a predetermined amount of sub-video data. A disc reproducing apparatus for reproducing a disc on which a plurality of types of sub-pictures corresponding to the main picture are recorded, a designating means for designating two or more kinds of sub-pictures from the plurality of kinds of sub-pictures; In the state where the reproduction of one type of sub-picture of the two or more types of sub-pictures specified by the above is completed for one or a plurality of the continuous reproduction units, the reproduction start position of the same one or the plurality of consecutive reproduction units is changed. A disc playback apparatus comprising: a playback control means for searching for and playing back the same main picture and another type of sub-picture designated by the designation means. 8. A disk reproducing method for reproducing a disk on which a main video and a plurality of types of sub-videos corresponding to the main video are recorded, wherein at least two types of sub-videos are designated from the plurality of types of sub-videos. A disc reproducing method, comprising: a specifying step; and a reproduction control step of automatically switching and reproducing the two or more types of sub-videos specified in the specifying step in a predetermined reproduction unit. 9. A disc reproducing method for reproducing a disc on which a main video and a plurality of types of sub-videos corresponding to the main video are recorded, a specifying step of specifying a predetermined sub-video from the plurality of types of sub-videos And a reproduction control step of automatically switching the sub-video specified in the specifying step between a display state and a non-display state for each predetermined reproduction unit and reproducing the same. 10. A disc reproducing method for reproducing a disc on which a main video and a plurality of types of sub-videos corresponding to the main video are recorded, a specifying step of specifying a predetermined sub-video from the plurality of types of sub-videos And a playback control step of automatically switching the contrast for each predetermined playback unit to play the sub-picture designated in the designation step.