JPH11355710A - Authoring device and its method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To create sound and picture streams with constantly exact and valid size by calculating data size of a transferred sound data stream from sound transfer rate and the counted number of frames and recording the data size together with the sound data stream. SOLUTION: Sound data is transmitted from a sound reproducing device 2 to a sound fetching device 3 by being synchronized with a VTR 1 and is transmitted to a file server 6 in a data recorder 5 by a data transmitter 7. On the other hand, a picture synchronizing signal from the VTR 1 is inputted in a frame counter 10 in a sound data processor 4, the number of frames is counted and stored. The number of frames is taken out and transmitted to a system controller 11 by an encoding controller 9. Sound size is calculated, its value and information to specify an exact end position of the sound data is transmitted to a data size adjuster 12 by the system controller 11. The sound data size is changed to the calculated size by the data size adjuster 12.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] The present invention relates to, for example, MPEG2
And an authoring system for generating and recording a multiplexed bit stream according to a digital video coding standard such as a digital video coding standard.

[0002]

2. Description of the Related Art In recent years, as one of the digital video coding standards for realizing various multimedia, M
The system of PEG2 (Moving Picture Experts Group 2) is adopted. On the other hand, a DVD (Digita1 Versatile)
New storage media such as Disk) are attracting attention.

[0003] More specifically, for all kinds of video materials such as movie videos and music videos, images of the video materials and background sounds corresponding to the images, dubbing in a plurality of languages, subtitles in a plurality of languages, and the like are provided. The importance of an authoring system used when multiplexing related information into individual coded streams in accordance with international standards such as MPEG to generate a multiplexed bit stream format and digitally record the data in a storage medium is increasing.

On the other hand, in the case of NTSC, which is one of the generally used television image transfer systems, a system called a drop frame is widely used in broadcasting. That is, N
The TSC is 29.97 frames / sec, and the number of frames consists of 30 frames from 0 to 29. Therefore, if time is always represented by frames 0 to 29,
An error of 10 108 frames (3.6) seconds occurs per hour. This method is called a non-drop frame method. On the other hand, each minute is 0, 10, 20, 30, 4
00 frame and 01 at the start position of each minute other than 0 and 50
There is a method of skipping two frames including a frame, which is called a drop frame method. In the drop frame method, errors that occur are reduced by skipping frames.

[0005]

However, there is a situation in which it cannot be determined from the appearance of a video tape alone whether it is recorded in a non-drop frame format or recorded in a drop frame format. Was.
That is, when fetching audio data from a video tape, the actual accurate time cannot be determined only by the time code of the video tape.

[0006] In addition, various equipment such as a filter device may enter the encoding of the image and the sound and the data fetching timing between the image source and the sound source and the encoding device, and specify the exact end timing. It was difficult to do.

[0007] To specify the exact data size,
Although the transfer rate and time are required, the exact data size cannot be calculated when importing LPCM Audio or the like because the exact time is unknown.

On the other hand, when image coding or audio coding is performed, after the coding is completed, when the coded stream is sent from the coding apparatus to the data capturing apparatus, there are various buffers, and the last coded stream is provided. Is output, the invalid data stream is fetched from the encoding device, output to the file server, and sent out.

For this reason, a unique end code is added to the encoded data to make the determination. However, the end code used in MPEG cannot be limited to one place, and it is difficult to determine the coding end position.

In the case where the video tape is divided into a plurality of pieces, the encoding must be stopped in the middle of the tape exchange, but the apparatus is temporarily stopped, and after the tape exchange, the encoding is started as it is. Although there is no problem, when the operation is completely stopped, a method of recording the state of the internal buffer and the like is required, and the configuration becomes complicated.

For this reason, the encoded stream is temporarily stored in the HDD
However, since the invalid data is appended to the end of the encoded data as described above, the effective data size is unknown. Therefore, when encoding is restarted, invalid data is interposed in the middle.

An object of the present invention is to provide an authoring apparatus and an authoring method which can always produce audio and image streams of an accurate effective size.

[0013]

SUMMARY OF THE INVENTION Accordingly, the present invention (claim 1) provides an authoring apparatus for generating and storing a stream of a predetermined format from a medium on which image data and audio data are recorded. Means for receiving data together with a synchronization signal of a corresponding image frame, generating a stream of the audio data, means for counting the number of received image frames, means for storing the counted number of frames, and an audio transfer rate. There is provided an authoring apparatus comprising: means for calculating a data size of a transferred audio data stream from the counted number of frames; and means for recording the data size together with the audio data stream.

Further, the present invention (Claim 2) provides the authoring apparatus according to Claim 1, wherein the medium is provided with a time code assigned to an image frame. I do.

Further, the present invention (claim 3) is characterized in that, in the above-mentioned claim 1, further comprises means for adjusting the size of the recorded audio data stream in accordance with the calculated data size. An authoring device is provided.

Further, according to the present invention (claim 4), the image data is read from a medium on which the image data is recorded and encoded, and an encoded stream of image data in a predetermined format is generated from the encoded data. In an authoring apparatus for storing, an authoring apparatus is provided, comprising: a unit for counting a data size of an encoded stream of the image data; and a unit for storing the data size when the encoded stream of the image data is stored. I do.

Further, the present invention (Claim 5) is characterized in that, in the above-mentioned Claim 4, further comprises means for adjusting the size of the recorded encoded stream in accordance with the calculated data size. An authoring device is provided.

Further, the present invention (claim 6) relates to an authoring method for generating and storing a stream of a predetermined format from a medium on which image data and audio data are recorded, and corresponding to the audio data from the medium. Receiving together with a synchronization signal of an image frame, generating the stream of audio data, counting the number of received image frames, storing the counted number of frames, an audio transfer rate and the counting. From the number of frames
An authoring method is provided, comprising: calculating a data size of a transferred audio data stream; and recording the data size together with the audio data stream.

Further, the present invention (claim 7) is characterized in that, in the above-mentioned claim 6, further comprising the step of adjusting the size of the recorded audio data stream in accordance with the calculated data size. Authoring method is provided.

Further, according to the present invention (claim 8), the image data is read from a medium on which the image data is recorded and encoded, and an encoded stream of image data in a predetermined format is generated from the encoded data. In the authoring method for storing, there is provided an authoring method including a step of counting a data size of an encoded stream of the image data and a step of storing the data size when the encoded stream of the image data is stored. .

Further, the present invention (claim 9) is characterized in that, in the above-mentioned claim 8, the method further comprises the step of adjusting the size of the recorded coded stream according to the calculated data size. Authoring method is provided.

[0022]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An authoring apparatus according to a first embodiment of the present invention will be described with reference to FIG. In the present embodiment, a case in which audio data is captured will be described. This system comprises a VTR 1 containing audio data to be captured,
An audio reproducing device 2 connected to the VTR 1 to reproduce an audio portion; an audio capturing device 3 connected to the audio reproducing device 2 to create digital audio data; and an audio capturing device 3 connected to the audio capturing device 3, Is connected to the audio data processing device 4 via the network, and receives audio digital data from the audio data processing device 4 for receiving the digital data of the predetermined format. And a data recording device 5 for recording recorded audio data.

First, audio data is sent from the audio reproducing device 2 that reproduces in synchronization with the VTR 1 to the audio capturing device 3. Then, the data is sent to the file server 6 in the data recording device 5 via the network by the data transmitter 7 through a predetermined process in the audio data processing device 4. The file server 6 records audio data at a predetermined position specified in the authoring scenario 8.

On the other hand, the image synchronizing signal from the VTR 1 is VT
At the same time as input from R1 as a reference signal of the audio reproduction device 2, the frame counter 1 inside the audio data processing device 4
Input to 0. The frame counter 10 counts and stores the number of frames from the start to the end of encoding. Further, the encoding controller 9 controls the start and end of the capture of the audio data. Further, the encoding controller 9 sends control signals for counting start and end to the frame counter 10.

Further, the encoding controller 9 takes out the number of frames from the start to the end of the encoding from the frame counter 10 after the data fetching is completed, and transmits it to the system controller 11 in the data recording device 5 via the network. The system controller 11 calculates the size of the audio data from the transfer rate of the audio data obtained from the authoring scenario 8 and the number of frames of the fetched data transmitted from the encoding controller 9, and calculates the value and the correct end position of the audio data. Is sent to the data size adjuster 12.

The data size adjuster 12 changes the size of the audio data in the file server 6 from the information specifying the data size and the position of the audio data to the calculated size.

Thus, the last valid data position can be specified even when the encoding must be stopped halfway, such as when exchanging a tape. Therefore, even when encoding is restarted, editing can be continued without invalid data remaining on the way.

A second embodiment of the present invention will be described with reference to FIG. In the present embodiment, a case of image coding will be described. This system comprises a VTR 1 containing image data to be captured, an audio reproducing device 2 connected to the VTR 1 and reproducing an audio portion, and a VTR 1 and an audio encoding device 1
3 and an image / audio capturing device 15 for encoding and generating digital data of images and audio, and an image / audio capturing device 15 connected to the image / audio capturing device 15 via the network and Receiving the data,
And a data recording device 20 for recording image data and audio data having a predetermined format.

First, image data and audio data are transmitted from the VTR 1 to the image / audio capturing device 15, encoded by the image encoding device 17, transmitted to the data transmitter 18, and transmitted to the file server 27 via the network. Can be Authoring scenario 26 in file server 27
Is stored as a coded audio / video stream at a predetermined position designated by.

On the other hand, the encoding device 17 determines the data size of the simultaneously encoded stream by the encoded data amount counter 1.
Send to 9. The encoding controller 21 controls the start and end of encoding of voice and image data, takes out the encoded data size from the encoded data amount counter 19, and transmits it to the system controller 23 via a network.

The system controller 23 reads out the coded data size sent from the coding controller 21, and sends the value and information for specifying the recording position of the audio / image stream obtained from the authoring scenario 26 to a data size adjuster. Send to 25.

The data size adjuster changes the size of the image / audio stream in the file server to the received size from the information specifying the data size and the position of the audio / image stream.

As a result, the last valid data position can be specified even when the encoding must be stopped halfway, such as when exchanging a tape. Therefore, even when encoding is restarted, editing can be continued without invalid data remaining on the way.

In the above embodiment, the data server is connected to the file server via the network. However, as shown in FIG. 3, even if the data server is directly connected to the local computer 31 to form a data image on the hard disk. Good. Other configurations are the same as those of the second embodiment. Of course, similarly, in the first embodiment, the data image may be formed on the hard disk by directly connecting to the local computer 31.

[0035]

Accordingly, the authoring apparatus according to the present invention can always produce audio and image streams of an accurate size, so that it is possible to edit only valid data.

[Brief description of the drawings]

FIG. 1 is a configuration diagram showing a first embodiment of an authoring device according to the present invention.

FIG. 2 is a configuration diagram showing a second embodiment of the authoring apparatus according to the present invention.

FIG. 3 is a configuration diagram showing a modified example of the second embodiment of the authoring device according to the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 VTR 2 Audio reproduction device 3 Audio capture device 4 Audio data processing device 5 Data recording device 6 File server 7 Data transmitter 8 Authoring scenario 9 Encoding controller 10 Frame counter 11 System controller 12 Data size adjuster 13 Encoding device 15 Image and audio capture device 16 Frame counter 17 Image encoder 18 Data transmitter 19 Encoded data amount counter 20 Data recording device 21 Encoding controller 23 System controller 25 Data size adjuster 26 Authoring scenario 27 File server 31 Computer

Claims (9)

[Claims] 1. An authoring apparatus for generating and storing a stream of a predetermined format from a medium on which image data and audio data are recorded, wherein the authoring apparatus receives audio data from the medium together with a synchronization signal of a corresponding image frame, and Means for generating a stream of data, means for counting the number of received image frames, means for storing the counted number of frames, and, based on the audio transfer rate and the counted number of frames, An authoring apparatus comprising: means for calculating a data size; and means for recording the data size together with the audio data stream. 2. The authoring apparatus according to claim 1, wherein the medium is provided with a time code assigned to an image frame. 3. The authoring apparatus according to claim 1, further comprising: means for adjusting a size of the recorded audio data stream in accordance with the calculated data size. 4. An authoring apparatus for reading and encoding said image data from a medium having image data recorded thereon, and generating and storing an encoded stream of image data in a predetermined format from said encoded data. An authoring apparatus, comprising: means for counting the data size of the encoded stream of the image data; and means for storing the data size of the image data when the encoded stream is stored. 5. The authoring apparatus according to claim 4, further comprising: means for adjusting a size of the recorded coded stream according to the calculated data size. 6. An authoring method for generating and storing a stream of a predetermined format from a medium on which image data and audio data are recorded, wherein receiving the audio data from the medium together with a synchronization signal of a corresponding image frame. Generating a stream of the audio data;
Counting the number of received image frames, storing the counted number of frames, calculating a data size of the transferred audio data stream from an audio transfer rate and the counted number of frames, Recording the data size along with the audio data stream. 7. The authoring method according to claim 6, further comprising the step of adjusting the size of the recorded audio data stream according to the calculated data size. 8. An authoring method for reading and encoding the image data from a medium on which the image data is recorded, generating an encoded stream of image data in a predetermined format from the encoded data, and storing the encoded stream. An authoring method, comprising: counting the data size of the encoded stream of the image data; and storing the data size when the encoded stream of the image data is stored. 9. The authoring method according to claim 8, further comprising the step of adjusting the size of the recorded coded stream according to the calculated data size.