JP3422547B2 - Video recording and playback method - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus and method for recording and reproducing image data of interactive movies, games, etc. on a disk recording device such as a CD-ROM, and more particularly, for a scene to be reproduced subsequently to an image of a certain scene. The present invention relates to a video recording / playback apparatus and method that, when determining at the time of playback, a scene in which a plurality of video candidates exist and which is to be played back does not interrupt the playback of the currently playing scene and the succeeding scene.

[0002]

2. Description of the Related Art Conventionally, as a video recording / reproducing apparatus and method of this type, there have been those shown in FIGS.
FIG. 5 is a block diagram showing the configuration of a conventional video recording / reproducing apparatus, and FIG. 6 is a diagram showing a video scene recording / reproducing method in the conventional video recording / reproducing apparatus.

First, referring to FIG. 5, the structure of a conventional video recording / reproducing apparatus will be described. 1 is a recording means for recording a video scene on a disc, 2 is a reading means for reading a video from the disc, and 4 is data for the video scene. A disk 5 for recording is a display means for displaying a video scene. And usually
Video data is recorded on the disk 4 by the recording means 1, and the video is read by the reading means 2 and displayed on the display means 5.

Next, the operation of the conventional video recording / reproducing apparatus shown in FIG. 5 will be described with reference to FIG. In FIG. 6, a'is a video scene currently recorded on a track of the disc 4 (recorded as video data), and C1, C2, ..., Cn are other recording positions of the disc. Or other video scenes recorded on the track, which are video candidates to be selected to branch from the video scene a ′ and continue to play back to the video scene a ′.

As shown in FIG. 6, it takes at'time to reproduce the video scene a ', and after the at' time has elapsed, for example, if the video scene to be branched next is C1, the video scene C1 Access the reading means 2 at the beginning of
The reading is started from the beginning and the reproduction is continued. The same applies when accessing the video scenes C2, ..., Cn.

[0006]

However, in the above-described conventional video recording / reproducing system, when there are a plurality of video candidates for successive video scenes (hereinafter, also simply referred to as scenes), the last scene of the previous scene is not always present. The next scene cannot be recorded in a physical area that is continuous with the physical area in which dots are recorded. Therefore, from the end of playback of one scene to the start of playback of the next scene,
There was a problem that video playback was interrupted for the time required to access the disc.

The present invention has been made in view of the above problems, and a video recording / reproducing apparatus for preventing a discontinuity between a currently reproduced scene and a continuously reproduced scene even when a scene change occurs. And to provide a method.

[0008]

In order to achieve the above object, a video recording / reproducing method according to the present invention uses a disc in which a plurality of video candidates to be branched from a video scene and recorded next are recorded. , by utilizing the difference in transfer capability and data recording density of the disk, the video in the video recording and reproducing method for reading preparation video candidates to be reproduced next during playback of a video scene, during the reproduction of a video scene Candidate record
The image candidates of the disk the head portion of the image candidates by accessing the recording position before the scene change occurs
It is characterized in that it is stored in the buffer storage means from the recording position .

In order to achieve the above object, the video recording / reproducing method according to the present invention records a plurality of video data including a video scene on a disc, and a video candidate of a scene to be reproduced subsequently to a video of a certain scene. In the video recording / reproducing method in which there are a plurality of scenes and the selection of the scene is decided at the time of reading the video data, the video data of the scene currently being read is pre-read into the buffer storage device by utilizing the difference between the transfer capacity of the disc and the data recording density. When the scene change occurs, the read-out data is stored, and the read-out preparation is performed for the video data of the succeeding scene.

Further, in order to achieve the above-mentioned object, the video recording / reproducing apparatus according to the present invention has a head portion of all video candidates of a scene following a physical area continuous with a physical area in which a final point of the scene is recorded. Recording, pre-read the beginning part of all the video candidates during playback of the current scene by utilizing the difference between the disc transfer capacity and the data recording density,
When a scene change occurs, preparation is made to read out the video data of the succeeding scene during the reproduction of the prefetch data.

Further, in order to achieve the above-mentioned object, the video recording / reproducing apparatus according to the present invention utilizes all the video images of the scenes that continue during the reproduction of the current scene by utilizing the difference between the transfer capacity of the disc and the data recording density. The head portion of the candidate is pre-read, and when a scene change occurs, preparation is made to read out the video data of the succeeding scene during the reproduction of the pre-read data.

[0012]

In particular, the video recording / reproducing apparatus according to the present invention pre-reads the video data from the disk to the buffer storage device and, when a scene change occurs, follows the video data read from the disk and then the video data from the disk. The read-ahead data stored in the buffer storage device is played back until the subsequent read-out of the video data determined during reading, so that there is a break between the scene currently being played and the scene to be continuously played. Allows you not to.

The video recording / reproducing method according to the present invention is particularly
In a video recording / reproducing method that determines the selection of scenes to be continuously reproduced from a plurality of video candidates at the time of reading video data, the video data of the scene currently being read is used by utilizing the difference between the transfer capacity of the disc and the data recording density. By pre-reading and storing in the buffer storage device and preparing to read out the video data of the scene that follows during playback of the pre-reading data when a scene change occurs, the current playback scene and the scene that continues It is possible to keep it uninterrupted.

The video recording / reproducing method according to the present invention is particularly
The beginning part of all the video candidates following the physical area following the last point of the scene is recorded, and the beginning part of all the video candidates is recorded during playback of the current scene by using the disc transfer capacity and the difference in data recording density. By pre-reading and preparing to read out the video data of the scene that continues during playback of the pre-reading data when a scene change occurs,
This makes it possible to avoid a break between the currently playing scene and the scene to be continuously imaged.

The video recording / reproducing method according to the present invention is particularly
Video data of the scene that continues during playback of the prefetch data when the beginning part of all video candidates of the scene that continues during playback of the current scene is prefetched by using the difference between the disc transfer capacity and the data recording density. By preparing to read out, it is possible to prevent a break between the scene being currently reproduced and the scene to be continuously imaged.

[0016]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described in detail below with reference to the accompanying drawings. First, a video recording / reproducing apparatus according to an embodiment of the present invention will be described with reference to FIG. FIG. 1 is a block diagram showing the structure of a video recording / reproducing apparatus according to the present embodiment. 1 is a recording means for recording each video data on a disc, 2 is a reading means for reading the video data from the disc, and 3 is a read means. A buffer storage device for temporarily storing video data using the difference between the transfer capacity of the disc and the data recording density, 4 is a disc for recording data of the video scene,
Reference numeral 5 is a display means for displaying the reproduced video scene. Here, the recording means 1, the disk 4, and the display means 5 are shown in FIG.
It is similar to the conventional one shown in FIG. The recording method for the disc 4 is a method of recording each video scene in a physically continuous area.

In the present embodiment, the reading means 2 transfers the video data read from the disk 4 to the buffer storage device 3 for temporary storage. Then, the temporarily stored video data is appropriately transferred to the display means 5 and displayed. Usually, since the transfer rate read from the disk is slower than the data rate sent from the buffer storage device to the display means, there is a difference between the time temporarily stored in the buffer storage device and the display time. In this way, the temporary storage in the buffer storage device 3 until the pre-reading and display is referred to as the pre-reading.
In this embodiment, this prefetching is used to prevent interruption of the video scene at the branch of the video scene.

That is, in the present embodiment, there are a plurality of video candidates of a scene to be reproduced subsequent to the video of a certain scene, and which scene is to be reproduced is determined by the video recording / reproducing method when reading the video data. By utilizing the difference between the disc transfer capacity (transfer rate) and the data recording density (data rate), the video data of the scene currently being read is prefetched and stored in the buffer storage device, and when the scene change occurs, the prefetch data is read. The interruption of the scene reproduction is prevented by preparing to read out the video data of the scene that continues during the reproduction of.

Next, with reference to FIG. 2, the operation of the video recording / reproducing apparatus according to this embodiment, that is, the video recording / reproducing method will be described. FIG. 2 is a diagram showing a video scene recording / reproducing method according to the first embodiment using the video recording / reproducing apparatus in the embodiment shown in FIG. In FIG. 2, assuming that a scene change occurs at x, at1 is the recording time from the start of reproduction of a to the branch identification, at2 is the time during which the continuation of the current image is reproduced from the branch identification of a, and at is Assuming the time from the start of reproduction of a to the start of reproduction of the video at the branch destination, the reading operation from the disk 2 is performed as follows.

1. From the start of reproduction of scene a, prefetching is started at the same time as reproduction, using a transfer rate of 100%.
(It is only necessary to pre-read the at time, but the branch point may not be known in advance.) The pre-read data is stored in the buffer storage device 3 that stores the pre-read data. At this time, the read-ahead is interrupted when the buffer storage device is exceeded. 3. When the branch is found, access to the branch destination is started. If the prefetch by the time at has not been completed by this time, the access is started after the prefetch is completed.

Further, each video scene and buffer storage must satisfy the following conditions. 1. In order to be able to read ahead up to at time during at- (access time + overhead time), at-
(Access time + Overhead time) x Transfer rate
> Data rate xat time, 2. 2. Buffer capacity> (access time + overhead time) x data rate, 3. Overall time of video scene a> at (minimum continuous time of video scene), Time at2> access time + overhead time (minimum time from branch point to scene end) may be satisfied.

Next, a video recording / reproducing method according to the second embodiment of the present invention will be described with reference to FIG. FIG. 3 is a diagram showing a video scene recording / reproducing method according to a second embodiment using the video recording / reproducing apparatus in the embodiment of FIG. In FIG. 3, a, b1, b2, ..., Bn are respectively one video scene as in FIG. 2, and a scene b is followed by a scene b1, b2, ..., Or bn. still,
Also in this embodiment, the video recording / reproducing apparatus shown in FIG. 1 is used, and the function of each part is the same as that described in the first embodiment. However, the operation, that is, the recording / reproducing method is performed as follows.

First, the recording method for the disc 4 is performed by the recording means 1 as follows. 1. Each video scene is recorded in a physically continuous area. 2. B1, b2, ... in the area continuous to the video scene a
., Bn head part (bt1, bt2, ..., bt
n) is recorded to complete the video scene a. 3. The head portion to be recorded is the recording time corresponding to (access time + overhead time). The amount of data corresponds to (access time + overhead time) × data rate.

In the second embodiment of FIG. 3, assuming that the point x is the final point of the video scene a, at is the recording time of the video scene a, and bt1 is the recording time of the beginning part of b1, the disc 2 is recorded. Reading is performed as follows.

1. From the start of reproduction of scene a, prefetching is started at the same time as reproduction, using a transfer rate of 100%. 2. The prefetched portion is stored in the buffer storage device 3 that stores the prefetched data. However, if it exceeds the buffer, prefetch is interrupted. 3. After prefetching is completed, the scene a until the beginning btn
Is read out and the branch destination is determined, access to the branch destination is started. The access is performed to a position corresponding to (access time + overhead time) from the beginning of the branch destination.

Further, each video scene and buffer storage must satisfy the following conditions. 1. In order to prefetch the playback time of the scene a + the playback time of the beginning part bt1 + bt2 + ... + btn during the playback time of the scene a, the playback time of the scene a x the transfer rate> the data rate x (the playback time of the scene a + (Reproduction time of the beginning part bt1 + bt2 + ... + btn),

2. Considering that the reading means 2 accesses the scene a from the position (access time + overhead time) from the beginning, the reproduction time of the scene a = at
-(Access time + overhead time), 3. Buffer capacity> (access time + overhead time) x data rate xn.

Next, a video recording / reproducing method according to a third embodiment of the present invention will be described with reference to FIG. 4 is shown in FIG.
FIG. 11 is a diagram showing a video scene recording / reproducing method according to a third embodiment using the video recording / reproducing apparatus in the embodiment.
In FIG. 4, a, b1, b2, ..., Bn are respectively one video scene, and the scene b is followed by the scenes b1, b.
2, ..., Or bn continues. Recording on the disc 4 is performed by the recording means 1 by recording each video scene in a physically continuous area.

In FIG. 4, assuming that x is the final point of the scene a, at is the recording time of the video scene a, and bt1 is the recording time of the beginning part of b1, the reading method from the disc 4 is as follows. Done. 1. From the start of playback of scene a, prefetching is started at the same time as playback, using a transfer rate of 100%. 2. After the pre-reading of scene a is completed, the beginning of scene b1 is accessed to pre-read the beginning part bt1 of b1, then the beginning of scene b2 is accessed to pre-read the beginning part bt2 of b2, and the beginning of scene bn is accessed. The head portion btn of bn is prefetched.

3. The prefetched portion is stored in the buffer storage device 3 that stores the prefetched data. If it exceeds the buffer, read ahead is interrupted. 4. When prefetching is completed (prefetching of all branch destinations is completed), all scenes a are reproduced and the branch destinations are determined, and then access to the branch destinations is started. The access is a position corresponding to (access time + overhead time) from the beginning of the branch destination.

Further, each video scene and buffer storage must satisfy the following conditions. 1. During the playback time of scene a, the playback time of scene a +
Since the access time for n times is required to be able to prefetch the playback time of the beginning part bt1 + bt2 + ... + btn, (playback time of scene a-access time xn)
x transfer rate> data rate x (reproduction time of scene a + tip part bt1 + bt2 + ... + btn reproduction time),

2. Considering that the reading means 2 accesses the scene a from the position of (access time + overhead time) from the beginning, the reproduction time of the scene a = at
-(Access time + overhead time), and Buffer capacity> (access time + overhead time) x data rate xn.

[0033]

As apparent from the above description, the present invention is provided with a buffer storage device for storing prefetch data, and prepares to read out the video data of the scene that continues during the reproduction of the prefetch data when a scene change occurs. By doing so, it is possible to reproduce an image in which there is no gap between the scene currently being reproduced and the scene to be continuously reproduced, and it is possible to realize a high-quality image.

[Brief description of drawings]

FIG. 1 is a block diagram showing a configuration of a video recording / reproducing apparatus according to an embodiment of the present invention.

2 is a diagram showing a video scene recording / reproducing method according to a first embodiment using the video recording / reproducing apparatus in the embodiment of FIG.

FIG. 3 is a diagram showing a video scene recording / reproducing method according to a second embodiment using the video recording / reproducing apparatus in the embodiment of FIG.

4 is a diagram showing a video scene recording / reproducing method according to a third embodiment using the video recording / reproducing apparatus in the embodiment of FIG.

FIG. 5 is a block diagram showing a configuration of a conventional video recording / reproducing apparatus.

FIG. 6 is a diagram showing a recording / reproducing method of a video scene in a conventional video recording / reproducing apparatus.

[Explanation of sign]

1 recording means 2 Read-out means 3 buffer storage 4 discs 5 Display means

Claims (2)

(57) [Claims] 1. A disc in which a plurality of video candidates to be reproduced next after being branched from a video scene are recorded is used, and the reproduction of a video scene is performed by utilizing the difference between the disc transfer capacity and the data recording density. In a video recording / reproducing method for preparing to read out a video candidate to be reproduced next, the recording position of the video candidate is accessed by accessing the recording position of the video candidate during reproduction of a certain video scene.
A video recording / reproducing method characterized in that the beginning portion of the video candidates is stored in the buffer storage means from the video candidate recording position on the disc before a scene change occurs. Wherein when a scene change occurs, the buffer storage hands stage image recording and reproducing method according to claim 1, wherein the reading out preparation of the video data subsequent Pull scene during playback.