JPH09107523A - Video storage/conversion method and device therefor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve the operability at a receiver side by improving a length of image reproduction time due to disturbance of a video image at start of transmission or delay in synchronization establishment to realize pause or slow reproduction in the device receiving and storing communication data including a video image and sending the data again in response to a transmission request. SOLUTION: A medium conversion processing section 1-7 eliminates undesired data being start of stored data in a reception medium storage section 1-5 and adds data for synchronization locking before the stored data. The processing is conducted without using a hardware. Thus, quick re-locking of synchronization lost by data storage is attained by a receiver side. The transmission data generated in this way are stored in a transmission medium storage section 1-9. Pause or slow reproduction is obtained from the processing result of timing able to stop a video image and realized by inserting fill bits at transmission.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to re-transmission in the case of storing data such as video and audio compressed and encoded by a communication protocol and transmitted in image communication, and re-transmitting the data when necessary. Smoothly and interactively play back the recorded data, especially when starting playback of the video or reducing the distortion of the video at the connection part of the accumulated data and performing video operations such as pause. The present invention relates to a video storage conversion method and an apparatus for the same.

[0002]

2. Description of the Related Art Conventionally, in image communication and the like in multimedia, communication data transmitted by compression encoding and multiplexing for real time communication is received and accumulated,
It is envisaged that this will be sent again. by the way,
The data processed for real-time communication is not for storage / playback, so if the received data is stored as it is and the data is newly transmitted, the video data with a large amount of data will result in a data error in the connection part of the storage unit. Distortion of the image was generated, and it took time to establish synchronization. In order to eliminate this, there is a method in which even hardware capable of analyzing even data delimiters is prepared in advance and then stored.

[0003]

However, when the data for real-time communication is received, accumulated, and retransmitted, the problem that the image is disturbed and it takes time to establish the synchronization is solved. Therefore, in the above-described conventional method in which the hardware capable of analyzing even the division of data encoding is prepared in advance and the data is accumulated, there is a problem that the scale of the hardware becomes large.

The present invention has been made to solve the above-mentioned problems, and when data such as voice and video including time-series converted video data for communication is stored and transmitted again, the video data is The length of the screen playback time due to the disturbance of the video that occurs at the beginning of transmission for playback and the delay in synchronization establishment is improved, and the time from the request to the transmission on the receiving side until the request is achieved is shortened. The purpose is to improve. Another object of the present invention is to improve the operability by providing the interactivity of the operation by realizing the pause and the slow reproduction.

[0005]

SUMMARY OF THE INVENTION In order to achieve the above object of improving image distortion, the method of the present invention receives and stores communication data which is compression-encoded and multiplexed for real-time communication. Then, in the case of retransmitting this as transmission data, the step of separating the received communication data by media, the step of accumulating each of the separated media data, and the reading of the accumulated media data and the communication Analyzing the data delimiters peculiar to the encoding method, optimally determining an unnecessary data range to be removed from the head part of each media data from the analyzed data delimiters, and The step of removing the data of the unnecessary data range determined by the above, and the transmission data of each media data from which the data of the unnecessary data range is removed. And means for picture recording conversion method characterized by comprising the steps of: storing converted to data, the.

Further, in order to achieve the object of improving the length of the screen reproduction time, in the method of the present invention, in the step of converting and storing the transmission data, the synchronization pull-in data is added before the transmission data. Is added and accumulated as a means.

Alternatively, in the stage of converting and accumulating the transmission data as described above, a default video corresponding to the connection of the video is determined in advance as the transmission data after the synchronization pull-in ends and the picture pull-in ends. Is converted and stored as a difference from the default image and stored.

In order to achieve the above object of improving the image distortion, the apparatus of the present invention receives and accumulates communication data which is compression-encoded and multiplexed for real-time communication, and stores the received communication data. In the device for transmitting again as a means, means for receiving communication data, means for separating the received communication data by media, and data delimiter specific to the communication encoding method for each of the separated media data. The optimum data of the unnecessary data range to be removed at the beginning of each media data from the analyzed data divisions, and the data of the optimum data of the unnecessary data range is removed and transmitted. Means for converting the data into data and storing the data; means for multiplexing the media data converted into the transmission data and stored; Means for transmitting data, and means for video storage conversion device characterized by having a.

Further, in order to achieve the object of improving the length of the screen reproduction time, in the device of the present invention, when the above-mentioned data conversion processing unit removes data in an unnecessary data range and converts it into transmission data. In addition, a means for adding and storing fill bit data, zero difference information, or uniform screen information as sync pull-in data before video media data is used as means.

Alternatively, when the above-mentioned data conversion processing unit performs a process of converting to transmission data, error correction is performed using an error correction code in the reception data, and a video storage conversion device is provided as means. To do.

Further, in order to achieve the purpose of improving the operability by realizing the temporary stop of the video to be transmitted, in the method of the present invention, the above-mentioned video storage conversion device stores the transmission data when transmitting the transmission data. An image storage conversion method is characterized in that it replaces transmission data and inserts an arbitrary number of fill bit data in an image data portion in a data division.

Further, in order to achieve the object of improving the operability by realizing slow reproduction of the image to be transmitted, in the method of the present invention, the above-mentioned image storage conversion device stores the transmission data when transmitting the transmission data. An image storage / conversion method is characterized in that replacement of transmission data and insertion of fill bit data in an image data portion in a data segment for a relatively short period are repeated.

The principle of the present invention is shown in FIGS. 6 and 7.

FIG. 6 is a flow showing the principle of data storage conversion processing.

First, in the data reading process 6-1, each media data such as audio and video in the data storage unit in which the received data is stored as it is is read. Next, in the data analysis process 6-2, the break of each time series data is analyzed for each medium. Next, in the optimum removal determination process 6-3, the range of unnecessary data to be removed is optimally determined from the data delimiters of each time series data that has received the result of the data analysis process 6-2. In this case, it is preferable that the criterion for the determination is to meet the necessary conditions for each medium (for example, to minimize the amount of data to be removed) and to synchronize each medium as needed. Next, noise removal processing 6-4
Then, in response to the result of the optimum removal determination processing 6-3, noise (unnecessary data) of each medium is removed. Next, in the data storage processing 6-5, the result of the noise removal processing 6-4 is written and stored in the data storage unit.

FIG. 7 is a schematic block diagram of an apparatus for executing the flow of FIG.

The communication data receiving section 7-1 receives communication data from the network. Received data separation unit 7-2
Separates the audio, video, and data of the multiplexed and transmitted communication data for each media. The data storage conversion unit 7-3 stores each medium such as voice, video, and data separated by the reception data separation unit 7-2 as time-series data as they are, and then reads them out to perform a data analysis process. Optimal removal determination processing and noise removal processing are performed and converted into transmission data and stored. The transmission data multiplexing unit 7-4 includes a data storage conversion unit 7-
The transmission data of the respective media such as video, audio, and data stored in 3 are multiplexed for transmission in response to a request. The communication data transmitter 7-5 transmits the data multiplexed by the transmission data multiplexer 7-4 to the network.

In the video storage conversion method and apparatus according to the present invention, unnecessary data at the beginning of the stored data that has been received is removed, so that the video generated first on the receiving side when the video data is reproduced. Eliminate the disorder. In addition, by performing the process of adding the data for synchronization pull-in before the accumulated data without using hardware after the accumulation of communication data, the quick re-pull-in of synchronization lost by the accumulation of communication data can be received. By doing so, the delay in synchronization establishment and the time required for video generation are reduced. In addition, the operability on the receiving side is improved by adding dummy data so that the start of the accumulated data to be actually transmitted can be predicted. Furthermore, the timing at which the image can be stopped is obtained from the above-described processing result in which the timing is clear, and by inserting fill bit data that is ignored as data,
Achieve pause and slow playback. As described above, the operability is improved as a result by increasing the reaction speed and providing interactivity such as temporary stop in the device that calls up the accumulated video as needed.

[0019]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described in detail below with reference to the drawings.

<< Embodiment 1 >> FIG. 1 shows a first embodiment of the present invention.
2 is a configuration diagram showing a video storage conversion device according to the embodiment example of FIG.

The communication data transmitting / receiving section 1-1 receives and transmits communication data from the network. The reception data separation unit 1-2 separates different media such as audio, video, and data that are multiplexed and transmitted for synchronization.

The data storage / conversion unit 1-3 accumulates each separated medium, and performs conversion processing and processing for maintaining synchronization of the media as necessary. In the data storage conversion unit 1-3, the reception media storage unit 1
-5 stores the audio, video, data, etc. received by the communication data transmitting / receiving unit 1-1 and separated by the received data separating unit 1-2 as time-series data as they are. The reception data storage units (1 to n) 1-6 are reception media storage units 1-5.
Video, audio, data, etc. are stored in each. The media conversion processing unit 1-7 converts the video, audio, data, etc. in each reception data storage unit 1-6 in which the time-series data is stored as it is, and creates storage data for transmission.
The conversion process is the data analysis process 6 shown in FIG.
-2, optimal removal determination processing 6-3, and noise removal processing 6-4 are performed to convert into transmission data. The data conversion processing units (1 to n) 1-8 are the media conversion processing units 1
In -7, conversion processing is performed for each of video, audio, data, etc. The transmission media storage unit 1-9 stores the video, audio, data, etc. converted by each data conversion processing unit 1-8. Transmission data storage unit (1 to n) 1
-10 stores the converted video, audio, data, etc. in the transmission media storage unit 1-9. The conversion control unit 1-11 moves the data in the reception media storage unit 1-5 to the transmission media storage unit 1-9 after conversion by the conversion process by the media conversion processing unit 1-7, and performs overall control thereof. .

The transmission data multiplexing unit 1-4 transmits / receives communication data to / from each medium such as video, audio and data stored in the transmission data storage units (1 to n) 1-9 according to a request from the receiving side. Multiplexed for transmission via section 1-1.

In this embodiment, a LAN, ISDN, etc. are assumed as the applicable network.

The data storage conversion unit 1-3 performs the data analysis process 6-2, the optimum removal determination process 6-3, and the noise removal process 6-4 shown in FIG. The optimum removal determination of the removal process (noise removal process) will be described in detail. In the explanation, H.264 based on the ITU-T recommendation, which is a standard for ISDN multimedia communication. 32
0 terminal is used as an example. H. In the H.320 terminal, H.320 is used. 3
21 After multimedia demultiplexing, the video is H.264. H.261 format, so that The conversion processing of the accumulated data will be described with reference to FIG.

H. Since 320 terminals need to exchange terminal capabilities and establish synchronization before communication is established, it takes time to establish an actual communication path. After that, the data is separated by the received data separating unit 1-2. The video data in this is H.264. 261 format, and synchronization must be established in two types of independent units. One of them is multi-frame synchronization (hereinafter referred to as BCH multi-frame synchronization) which is inserted at equal intervals independently of the content of data for the purpose of error correction of data communication. The other is a picture structure that is a unit of video. This unit starting with PSC (Picture Start Code) has a variable length.

In a data storage device that stores received data as it is and transmits it, when the reproduction of a certain unit of data is started or ended, the image is disturbed and the generation of a new screen is delayed because of the synchronization. This is because the establishment of

First, it takes a certain amount of time for BCH multi-frame synchronization to be established (the recommendation stipulates that synchronization can be reestablished within 0.75 seconds when the video communication rate is 46.4 kbps). However, after the BCH multiframe synchronization is established, it is necessary to detect the PSC unless the PSC is found. Further, the image generation is delayed at the time of starting the reproduction of the video data, and the main reason for this is that a picture having a full-screen intra structure usually has a large amount of data and it takes a long time to complete the communication. H. In the H.261 format video, there are a full-screen intra structure in which one picture can be played back by its picture structure alone, and an inter structure in which the video cannot be played alone but the video is reproduced from the difference.

In order to reproduce the video data transmitted on the receiving side, it is necessary to send the picture of the full screen intra structure first. On the contrary, in order to detect the PSC, it is desirable that the PSC is detected frequently, that is, it is desirable to transmit data having a picture structure with a small amount of data. In fact, transmitting an intra-structure picture takes a logical minimum of about 0.3 seconds and an average of about 1 second when the video communication rate is 68.6 kbps.

On the receiving side, H.264 Since the start of the picture structure is recognized after the establishment of the frame synchronization of H.261, it takes more time than the establishment time of the BCH multi-frame synchronization and the transmission time of the intra structure to establish the complete synchronization. . Conversely, if the stored data is converted in advance in accordance with the synchronization establishment procedure after the reproduction and the screen reproduction procedure, the generation time of the screen can be shortened on the receiving side when the video is reproduced.

A method of storing and transmitting without losing BCH multi-frame synchronization (generating a BCH multi-frame in real time at the time of transmission) can be considered, but in this case, hardware for processing the BCH multi-frame portion is required. Even in this case, since PSC detection is performed when PSC consistency cannot be obtained, a certain amount of time is required. Further, a method of performing PSC detection by hardware is also conceivable, but in this case, the scale of hardware is further increased.

A method for reducing the screen generation time is described in H.264. 261 will be described as an example with reference to FIG. The purpose is to make the receiving terminal receive the PSC with the intra structure in a state where the synchronization is established. The method consists of a combination of three approaches. The first is to recover the BCH multi-frame synchronization as soon as possible, the second is to cause the PSC to be pulled in as soon as possible, and the third is to analyze the data that is actually transmitted, so that the receiving terminal can obtain the target image. It is necessary to make adjustments so that signals are received preferentially from.

First, in order to establish the BCH multi-frame synchronization bit, dummy data necessary for re-pulling in synchronization defined by the standard is prepared. For example, frame synchronization bit 2-2 (1 bit), file identifier 2-3
(1 bit), image data or fill bit 2-4
(492 bits), error correction code 2-5 (18 bits)
A 512-bit frame pattern unit 2-1 composed of
At -6, the data including the frame synchronization pattern 2-7 every 512 bits is repeated three times to be dummy data.

In this case, the dummy data has a length of 512 (data length) * 8 (structural unit of multiframe) * 3 (frame synchronization reproduction establishment condition). The data to be inserted as a dummy may be fill bit data consisting of all fill bits, zero difference information having an inter structure, an intra structure screen (blue back, etc.) having a small amount of data, and the like. If this is transmitted first, BCH multiframe synchronization is quickly established.

The data contents after the establishment of BCH multi-frame synchronization will be described with reference to FIGS. After the BCH multi-frame synchronization is established, the picture structure will be transmitted. The picture structure 3-1 starts with a picture start code (PSC) 3-2 and has variable length video data 3-3.
Together with this, it becomes the unit structure of the image. Picture structure PSC
In order to finish the pull-in in the shortest possible time, data consisting of short video data is used at the beginning. For example, a single color screen such as a blue background having an intra structure and a small amount of data may be transmitted, or data having a difference of zero may be transmitted when an inter structure is sufficient. This is PSC
Depending on the pull-in procedure, you will choose which method is best. This is repeated as many times as the number of times the preparation for image generation is completed on the receiving side, for example, twice.

After the above preparation is completed, unnecessary data is removed in order to transmit a desired video picture having the full-screen intra structure. In this case, of the accumulated data, the part before the picture structure data of the intra structure is discarded. As described above, by accumulating the data in which the dummy data is inserted before the actual data and removing the unnecessary data, it is possible to speed up the screen generation at the time of receiving the accumulated video.

Since it is necessary to synchronize the audio with the video, a process for delaying the audio is performed corresponding to the amount of dummy inserted in the video.

The audio data also has a storage unit, but the unit is smaller than the picture unit of video and can be determined mechanically. It is possible to start the audio data from the position where the deviation is minimized, even if they are not adjusted so that there is no deviation from the video. In this way, the synchronization between the media is also secured to the maximum.

FIG. 4 is a diagram showing, in time series (or storage order), the image processing results of the conversion processes 6-2 to 6-4 performed by the media conversion processing unit 1-7. The accumulated video data 4-15 is obtained by removing the frame synchronization part from the video data accumulated in chronological order before conversion processing, and has a picture structure including PSC.
The converted data is the transmission data 4-1. As shown in the figure, the order 4-2 of transmission data is shown in time series (or accumulation order) from left to right and from top to bottom. The transmission data start position 4-5 is the head when data transmission is started. The frame structure 4-3 and the multi-frame structure 4-4 in which eight frame structures are collected are shown in FIG.
As shown in FIG. This is the format specified by the H.261 frame structure. If the synchronization is lost, the multi-frame structure is repeated three times for the frame synchronization establishment 4-7. The data 4-6 for establishing frame synchronization continues until the end of the multi-frame structure three times. The frame synchronization establishment data may be a fill bit, zero difference information (inter structure), or a uniform screen such as blue back (intra structure). If there is no loss of synchronism, the processing up to this point is unnecessary.

After that, the picture pull-in data 4-8
Is continued until the picture pull-in completion 4-9. Although the data content is as short as possible, an intra screen including PSC is desirable. Thereafter, the accumulated video data 4-15 is continued from the accumulated data start 4-10.

Details FIG. 4-11 shows a structure in which the data in the frame structure sandwiches the PSC 4-12. The dummy data 4-13 has contents unrelated to the accumulated video data.

In the above example, data such as fill bit (up to establishment of frame synchronization), difference zero, and blue back correspond to it. The accumulated video data 4-15, which is the original data, is inserted into the video data 4-14. However, since the dummy data is continued, the BCH multi-frame synchronization is properly processed so that the boundary of the picture structure is consistent.

<< Second Embodiment >> Another specific second embodiment of the present invention will be described.

The frame synchronization until the stored video data is inserted and the preparation until the PSC pull-in are the same as the above method. What is different is that a default image corresponding to the connection of images (a small amount of data even with a full-screen intra structure such as blue background) is set in advance. As for the data after the PSC pull-in is completed, the default screen of the full screen intra is transmitted, and the image to be actually transmitted is then converted into the inter format as a difference from the default and stored. If the video that has undergone the above conversion is stored, the default video will be played back at first, but a considerably high reaction speed can be expected.

Further, with respect to the accumulated data segmented by the frame synchronization unit, the error of the data which can be corrected by using the BCH error correction code is corrected in advance and accumulated, so that the synchronization can be surely realized.

<< Embodiment 3 >> Using FIG. 5, the same principle as described above is used as a third embodiment of the present invention.
H.264 which has accumulated data including BCH multi-frame synchronization. A method of temporarily stopping, slow-playing, and restarting the H.261 image will be described.

If the accumulated data itself does not include a BCH frame, H.264 If a fill bit is inserted at an arbitrary position when the 221 frame is generated, the pause and the restart can be realized. However, if BCH frames are also collectively stored in the video data, the pause is BC
H multi-frame synchronization must be established. For this purpose, it suffices to calculate where the unit of BCH multi-frame synchronization in the once accumulated video data is. In practice, with the method shown in the second embodiment, where the BCH multiframe is can be obtained by simple calculation.

In FIG. 5, the order of transmission data 5-1
Indicates the transmission order of the accumulated data. In the method of FIG. 4, the unit of the frame structure 5-3 is 512 bits, and the unit of the frame structure 5-3 is 8 × 512 = 40 from the transmission data start position 5-2.
The division of the multi-frame structure 5-4 appears in units of 96 bits. Therefore, the fill bit data of the BCH multi-frame consisting of 8 patterns in which fill bits are inserted in the image data 2-4 portion in the frame pattern unit such as 2-1 in this delimiter portion can be filled in the fill bit data position 5 Insert any number at -5. This allows
The fill bit can be inserted while the BCH frame synchronization is established, and the frame is not disturbed when restarting.
Since the inserted fill bit is ignored as data on the receiving side, the previous image is held until a new image is transmitted, so that pause or slow playback is realized.

When this method is implemented by an apparatus, if the video transmission buffer is a multiple of 4096 bits, temporary suspension and resumption by temporary replacement of the transmission buffer can be realized in a time corresponding to a buffer size unit. it can. If the buffer size is sufficiently small, it is possible to repeat the pause for a short time and execute slow playback. If the buffer size cannot be a multiple of 4096 bits,
The buffer size is set so that the least common multiple of the buffer size and 4096 is as small as possible. The position of the temporary stop is set to the BCH multiframe unit of the buffer, and the remaining part is replaced with fill bit data. Resuming is possible at the timing of buffer transmission a multiple of the above least common multiple. Slow playback, BC in the buffer
This can be realized by inserting fill bit data between H multiframes at an arbitrary ratio. Explaining with reference to FIG. 1, the insertion of the fill bit data is performed by the transmission / reception control means (not shown) between the data storage conversion unit 1-3 and the transmission data multiplexing unit 1-4 according to a transmission request from the transmission side or the reception side. It is done by order.

Since there is no stipulation in the recommendation regarding the limit of the length of the fill bit, some terminals may interpret it as an error if the fill bits are continuously received. In this case, the video can be almost stopped by performing slow playback at a very low speed in BCH frame units. Or
There is also a method of replacing the data content with an inter structure of zero difference and fill bit data. However, in this case, at the time of resuming the temporary stop, if the inter structure data is being transmitted, the timing of stopping the temporary stop is slightly delayed, which deteriorates the operability.

The start unit of BCH multiframe is 1
If the location can be identified, the start positions of other BCH multiframes appear in units of 4096 bits. Therefore B
Even if the CH multi-frame cannot be specified by hardware, the start position of all BCH multi-frames can be obtained by analyzing the accumulated data by software and detecting one multi-frame synchronization pattern. Therefore, in this embodiment, the same effect can be obtained by specifying one BCH multiframe position.

[0052]

INDUSTRIAL APPLICABILITY As described above, according to the present invention, in a device that stores communication data and retransmits it, the data stored in the device is converted into a transmission data of an appropriate format when the image is retransmitted. It is possible to provide a method of storing and a device that realizes the method, and the receiving side reduces the distortion of the image at the beginning of the image when receiving the accumulated data,
This has the effect of accelerating the reaction speed, and can improve the operability on the receiving side.

Further, since the timing at which the pause can be performed can be obtained as a result, the pause or slow reproduction of the stored video can be realized, and the operability on the receiving side can be improved.

[Brief description of the drawings]

FIG. 1 is a configuration diagram of an apparatus showing a first embodiment of the present invention.

2 shows an example of applying the present invention to H.264. It is a figure explaining a 261 frame structure.

FIG. 3 illustrates an example of applying the present invention to H.264. It is a figure explaining the picture structure used as the basis of 261 frames.

FIG. 4 is a diagram illustrating a specific example of a video conversion method according to the first embodiment.

FIG. 5 is a diagram illustrating a principle of pause and slow playback according to a third embodiment of the present invention.

FIG. 6 is a data storage conversion processing flow for explaining the principle of the present invention.

FIG. 7 is a schematic configuration diagram of an example of a device that executes a data storage conversion processing flow for explaining the principle of the present invention.

[Explanation of symbols]

1-1 ... Communication data transmitting / receiving unit 1-2 ... Reception data separating unit 1-3 ... Data storage converting unit 1-4 ... Transmission data multiplexing unit 1-5 ... Reception media storage unit 1-6 ... Reception data storage unit (1 ~ N) 1-7 ... Media conversion processing unit 1-8 ... Data conversion processing unit (1 to n) 1-9 ... Transmission media storage unit 1-10 ... Transmission data storage unit (1 to n) 1-11 ... Conversion Control unit 2-1 ... Frame pattern unit (512 bits) 2-2 ... Frame synchronization bit (1 bit) 2-3 ... File identifier (1 bit) 2-4 ... Image data or fill bit (492 bits) 2-5 ... error correction code (18 bits) 2-6 ... multi-frame structure (512 x 8 bits) 2-7 ... frame synchronization pattern 3-1 ... picture structure 3-2 ... PSC (picture start code: 20 bits) 3 3 ... Video data (variable data length) 4-1 ... Transmission data 4-2 ... Order of transmission data 4-3 ... Frame structure 4-4 ... Multi-frame structure 4-5 ... Transmission data start position 4-6 ... Frame Data for establishing synchronization 4-7 ... Frame synchronization establishment 4-8 ... Data for picture pull-in 4-9 ... Completion of picture pull-in 4-10 ... Start of accumulated data 4-12 ... PSC 4-13 ... Dummy video data 4-14 ... Video Data 4-15 ... Stored video data 5-1 ... Order of transmission data 5-2 ... Transmission data start position 5-3 ... Frame structure 5-4 ... Multi-frame structure 5-5 ... Fill bit data insertable position

Claims (10)

[Claims] 1. Received and accumulated communication data that is compression-encoded and multiplexed for real-time communication and transmitted,
In the case of retransmitting this as transmission data, separating the received communication data by media, accumulating each of the separated media data, and reading each of the accumulated media data to code the communication. A step of analyzing a data delimiter peculiar to an encoding method; a step of optimally determining an unnecessary data range to be removed from the head part of each media data from the analyzed data demarcation; And a step of removing the unnecessary data in the unnecessary data range, and a step of converting each media data from which the unnecessary data range has been removed into transmission data and storing the transmission data. Method. 2. In the step of optimally determining an unnecessary data range to be removed from the head portion of each media data, it is determined that the requirements of each media are satisfied and that synchronization is established according to the needs of each media. The image storage conversion method according to claim 1, wherein 3. The video storage conversion method according to claim 1, wherein in the step of converting and storing the transmission data, the synchronization pull-in data is added and stored before the transmission data. . 4. In the step of converting and storing the transmission data, the synchronization pull-in is completed, and a default video corresponding to the connection of the video is previously defined as the transmission data after the picture pull-in is finished, 2. The video storage conversion method according to claim 1, wherein the video is converted and stored as a difference from a default video. 5. Received and stored communication data which is compression-encoded and multiplexed for real-time communication and transmitted,
In a device that retransmits this as transmission data, a unit that receives communication data, a unit that separates the received communication data by media, and a specific encoding method for the communication for each of the separated media data. The data of the unnecessary data range that has been optimally determined by analyzing the delimiter of various data, and optimally determining the unnecessary data range to be removed from the head portion of each media data from the analyzed data delimiters. And a unit for converting each of the media data converted into the transmission data and accumulated, and a unit for transmitting the multiplexed transmission data. Video storage and conversion device characterized by. 6. The means for converting into transmission data and storing the received data, a receiving data storage unit for storing the separated media data, and a code for the communication by reading the media data stored in the reception data storage unit. Processing for analyzing data delimiters peculiar to the encoding method, processing for optimally determining an unnecessary data range to be removed from the head portion of each media data among the analyzed data demarcations, the optimal determination A data conversion processing unit that performs a process of removing data in an unnecessary data range and converting it to transmission data, and a process of ensuring maximum synchronization between media, and media data processed by the data conversion process unit The video storage conversion device according to claim 5, further comprising: a transmission data storage unit that stores the. 7. The data conversion processing unit, when removing data in an unnecessary data range and converting the data into transmission data, fill bit data, zero difference information, or a single piece of data as sync pull-in data before video media data. 7. The video storage conversion device according to claim 6, wherein processing for adding such screen information is performed. 8. The video storage conversion device according to claim 6, wherein the data conversion processing unit performs error correction using an error correction code in the received data when performing the process of converting to the transmission data. . 9. The method according to claim 1, wherein when transmitting the transmission data, the transmission data is replaced with the accumulated transmission data, and an arbitrary number of fill bit data is inserted in an image data portion in a data delimiter. Video storage conversion method. 10. When transmitting transmission data, it is repeated to replace the accumulated transmission data and insert fill bit data into an image data portion in a data delimiter for a relatively short period of time. The image storage conversion method according to claim 1.