JP2007325114A - Mobile communication video distribution system, video conversion server, and mobile communication video distribution method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To receive and excellently view even long-time video content at a video phone mobile unit of a mobile communication system. <P>SOLUTION: Between Web servers 30a-30c and video phone mobile units 40a-40d, a video conversion server 10 is connected and when receiving video content data requested by the video phone mobile unit 40a from the Web server 30a using the video conversion server 10, relevant video content data are received if there is no trouble in header information thereof. After the reception, reproduction time information of video data and audio data constituting the video content data is calculated, the video data and the audio data are synchronized based on the reproduction time information, both data are then multiplexed in accordance with the multiplexing standard for video phone mobile units and transmitted to the video phone mobile unit 40a. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a mobile communication video distribution system and a video conversion server that enable video to be viewed by receiving video content including audio and video data stored in a Web server by a videophone mobile device of the mobile communication system. The present invention relates to a mobile communication video distribution method.

In recent years, Web servers have been used for various purposes, and video content information is stored in the Web server, and a videophone mobile device such as a mobile phone equipped with a videophone function is stored in the Web server. It is also common to use data as packet data by directly collecting data.
However, the length of video content information that can be viewed on a videophone mobile device is limited to a few minutes. One reason for this is the effect of packet data buffering in a videophone mobile device. In a wireless environment with a very high error rate, packet loss or data corruption is likely to occur during communication, and the number of retransmissions also increases. In order to view, it is necessary to buffer a large amount of packet data in the terminal device. However, when viewing video content for a long period of time, it is necessary to perform more buffering. Therefore, an unrealistic long buffering time is required before the start of video viewing.

As a system for receiving this type of large-capacity video content information by a terminal device, there are technologies of Patent Documents 1 and 2.
Patent Document 1 is a video content conversion system that converts large-capacity video content data (video content information) into low-capacity video content data and transmits / receives the data via a network. More specifically, in the conversion center server, the format of the video content data stored in the storage device when accessed from the terminal device is converted into a format specified by the terminal device, and the video content data is transferred to the terminal device in this conversion format. To deliver.
JP 2003-259330 A

  In the above-mentioned patent document 1, a large amount of video content information can be distributed as a small volume by converting the format of the video content information into a format designated by the terminal device at the server. It assumes a wired line. In addition, although there is a statement that it can be implemented with a wireless line, a satellite communication line, or the like, which is a wireless line network, there is no disclosure of the contents realized in the mobile communication system.

For this reason, as described above, it is not possible to cope with retransmissions caused by packet loss or data corruption during communication in a wireless environment with a very high error rate, and long-term video content cannot be handled by mobile communication. There is a problem that the videophone mobile device of the system cannot receive and watch well.
The present invention has been made in view of such a problem, and a mobile communication video distribution system that can receive a video content for a long time by a videophone mobile device of the mobile communication system, and can be satisfactorily viewed. An object is to provide a video conversion server and a mobile communication video distribution method.

  In order to achieve the above object, a mobile communication video distribution system according to claim 1 of the present invention provides video content data composed of audio data and video data stored in a Web server to a videophone function of a mobile communication network. In a mobile communication video distribution system in which video content can be viewed by being received by an on-board mobile communication terminal, a communication connection is made to the Web server storing video content in response to a request from the mobile communication terminal. The first communication control means for receiving the header information of the requested video content data from the Web server, and the video content data corresponding to the case where the header information is not defective by checking the received header information. Is received and buffered, and if there is a malfunction, the mobile communication terminal is notified of the abnormality. When the call connection with the mobile communication terminal is disconnected, the cumulative value of the video content data received from the Web server is managed, and the communication with the Web server is disconnected. A second communication control means for requesting the Web server to continue the data of the video content data before the cutting based on a cumulative value of the data amount before the cutting, and the buffered video content data. The playback time information of the video data in the video content data is calculated based on the sampling rate information included in the header information of the video content data, and the playback time information of the audio data is determined from the predetermined arrangement time interval of the audio data in the video content data. Based on the time information calculation means for calculating the reproduction time information of the video data and the audio data. And synchronization control means for synchronizing audio data, and multiplexing control means for multiplexing the synchronized video data and audio data according to a videophone mobile station multiplexing standard and transmitting the multiplexed data to the mobile communication terminal. A video conversion server having the above is arranged in the mobile communication network.

  According to this configuration, in the video conversion server, when receiving the video content data requested by the mobile communication terminal from the Web server, the video content data is received if there is no defect in the header information. Calculate the playback time information of the video data and audio data that make up the video content data, synchronize the video data and audio data based on these playback time information, then multiplex both for video phone mobile equipment Multiplexed according to the standard and transmitted to the mobile communication terminal. Therefore, even in a wireless environment with a very high error rate, video content for a long time can be received by the videophone mobile device of the mobile communication system and viewed well.

If the header information is defective, the call connection with the mobile communication terminal is disconnected, so that the video content data is not properly downloaded from the Web server, or there is an abnormality in the video content data itself. In some cases, the malfunction can be detected quickly and the call connection with the mobile communication terminal can be disconnected, thereby preventing unnecessary communication.
Furthermore, even if the video conversion server is disconnected from the Web server for some reason, the video content data continued from the video content data received before the disconnection can be received from the Web server. Data can be distributed continuously.

  According to a second aspect of the present invention, there is provided a video conversion server for transferring video content data composed of audio data and video data stored in a Web server to a mobile communication terminal equipped with a videophone function via a mobile communication network. In the video conversion server that transmits and allows viewing of the video content on the mobile communication terminal, the communication is connected to the Web server in which the video content corresponding to the request from the mobile communication terminal is stored. A first communication control means for receiving the header information of the requested video content data; and if the header information is not defective by checking the received header information, Second communication control means for buffering and included in the header information of the received video content data Time information for calculating reproduction time information of video data in the video content data based on the sampling rate information, and calculating reproduction time information of the audio data from a predetermined arrangement time interval of the audio data in the video content data The video data and the audio data are synchronized with the calculation means, the synchronization control means for synchronizing the video data and the audio data based on the reproduction time information of the video data and the audio data, And multiplexing control means for performing control of multiplexing according to the mobile station multiplexing standard and transmitting to the mobile communication terminal.

  According to this configuration, in the video conversion server, when receiving the video content data requested by the mobile communication terminal from the Web server, the video content data is received if there is no defect in the header information. Calculate the playback time information of the video data and audio data that make up the video content data, synchronize the video data and audio data based on these playback time information, then multiplex both for video phone mobile equipment Multiplexed according to the standard and transmitted to the mobile communication terminal. Therefore, even in a wireless environment with a very high error rate, video content for a long time can be received by the videophone mobile device of the mobile communication system and viewed well.

The video conversion server according to claim 3 of the present invention is the video conversion server according to claim 2, wherein when the header information is defective, the second communication control means notifies the mobile communication terminal of the abnormality and moves the mobile communication terminal. The call connection with the communication terminal is disconnected.
According to this configuration, if the header information is defective, the call connection with the mobile communication terminal is disconnected, so the video content data is not properly downloaded from the Web server, or the video content data When there is an abnormality in itself, it is possible to quickly detect the malfunction and disconnect the call connection with the mobile communication terminal, thereby preventing unnecessary communication.

The video conversion server according to claim 4 of the present invention is the video conversion server according to claim 2 or 3, wherein the second communication control means manages a cumulative value of the amount of video content data received from the web server, When communication with the Web server is disconnected, a request for data to be continued from the video content data before disconnection is made to the Web server based on the accumulated value of the data amount before disconnection. Features.
According to this configuration, even if the video conversion server is disconnected from the Web server for some reason, the video content data continued from the video content data received before the disconnection can be received from the Web server. Data can be continuously distributed to mobile communication terminals.

According to a fifth aspect of the present invention, there is provided a mobile communication video distribution method in which video content data composed of audio data and video data stored in a Web server is transferred to a mobile communication equipped with a videophone function via a mobile communication network. In a mobile communication video distribution method for transmitting to a terminal and allowing video content to be viewed on the mobile communication terminal, communication connection to the Web server storing the video content in response to a request from the mobile communication terminal When the header information of the requested video content data is received from the Web server and the header information received in the first step is checked, the header information is not defective. The corresponding video content data is received and buffered, and if there is a malfunction, an error is passed to the mobile communication terminal. A second step of disconnecting the call connection with the mobile communication terminal, a cumulative value of the amount of video content data received in the second step, and managing communication with the Web server. A third step of making a request for data to be continued from the video content data before the cutting to the Web server based on a cumulative value of the data amount before the cutting when the cut state is entered; Calculating the reproduction time information of the video data in the video content data based on the sampling rate information included in the header information of the video content data received in the step, and defining the arrangement of the audio data in the video content data A fourth step of calculating reproduction time information of the audio data from the time interval, and based on the reproduction time information of the video data and the audio data The fifth step of synchronizing the video data and the audio data, and the synchronized video data and audio data are multiplexed with the videophone mobile station multiplexing standard and transmitted to the mobile communication terminal. And a sixth step.
According to this method, the same effect as that of the first aspect can be obtained.

  As described above, according to the present invention, there is an effect that even long-time video content can be received and viewed satisfactorily by the videophone mobile device of the mobile communication system.

Hereinafter, embodiments of the present invention will be described with reference to the drawings. However, parts corresponding to each other in all the drawings in this specification are denoted by the same reference numerals, and description of the overlapping parts will be omitted as appropriate.
FIG. 1 is a block diagram showing a configuration of a mobile communication video distribution system according to an embodiment of the present invention.
A mobile communication video distribution system 1 shown in FIG. 1 includes a video conversion server 10 that is a characteristic element of the present embodiment, a mobile communication network 20 to which the video conversion server 10 is connected, and the mobile communication network 20. Are connected to the video conversion server 10 via the mobile communication network 20 and communicate with a plurality of Web servers 30a, 30b, 30c each having video content files 31a, 31b, 31c. In addition, a plurality of videophone mobile devices 40a, 40b, 40c, and 40d that receive video content data from the video content files 31a to 31c by communication access with the Web servers 30a to 30c are provided. Each of the videophone mobile devices 40a to 40d corresponds to a mobile communication terminal such as a mobile phone equipped with a videophone function.

As shown in FIG. 2, the video conversion server 10 includes a communication control unit 11, an inter-server communication control unit 12, an address management unit 13, a file header control unit 14, a video data control unit 15, and a time information calculation. Unit (time information calculating means) 16, audio / video synchronization control section (synchronization control means) 17, and audio / video multiplexing control section (multiplexing control means) 18.
The communication control unit 11, the server-to-server communication control unit 12, and the address management unit 13 constitute a first communication control unit. The file header control unit 14 and the video data control unit 15 constitute a second communication control unit.

The Web servers 30a to 30c are configured to include a communication control unit 31 and a data management unit 32.
The video phone mobile devices 40 a to 40 d are configured to include a communication control unit 41, an input control unit 42, a video phone control unit 43, and a screen control unit 44.
The communication control unit 11 of the video conversion server 10 performs control for communicating with the videophone mobile devices 40a to 40d.
The inter-server communication control unit 12 performs control to communicate with the Web servers 30a to 30c using HTTP (Hyper Text Transfer Protocol).
The address management unit 13 manages the URL (Uniform Resource Locator) of the video content files 31a to 31c stored in the Web servers 30a to 30c and the ID number assigned to the URL.

The file header control unit 14 checks the header element of the content while downloading the video content data from the Web servers 30a to 30c, and confirms that the video distribution to the videophone mobile devices 40a to 40d is possible. Take control.
However, the contents of the check include, as check elements, the file size 51 of the video content, the bit rate 52, the content condition 53, the track information 54, the codec type 55, etc. as shown in FIG. It is.

  The check content is that the file size 51 does not exceed 40 Mbytes. The average bit rate of the bit rate 52 is 64 Kbps or less. First, the content condition 53 is not audio-only content. Second, the audio track playback time does not exceed one hour. Third, the screen size is 176 × 144. Fourth, the playback time of the video (video) track does not exceed one hour. Fifth, the information on the video track is arranged in the order of playback time. The track information 54 is that there is no Text (text) track. Second, the Video track exists. Third, there should be only one audio track. Fourth, there should be one Video track. First, the codec type 55 uses an audio codec that can be supported by a videophone mobile device. Second, the Video codec that can be supported by the videophone mobile device is used. Third, the chunks of the video track are not arranged in the order of playback time in the file.

The video data control unit 15 monitors the download amount of video content data distributed from the Web servers 30a to 30c, and controls whether or not all video content data has been received.
The time information calculation unit 16 calculates the reproduction time information of the information based on the sampling rate information included in the header information while downloading the data part of the video content data.
The audio / video synchronization control unit 17 considers the order of audio and video information based on the calculated reproduction time information, and performs time synchronization of audio and video information.
The audio / video multiplexing control unit 18 synchronizes the information of the synchronized audio and video according to the multiplexing method for the videophone mobile device.

The communication control unit 31 of the Web servers 30a to 30c generally performs data communication based on an HTTP communication request from an existing Web browser, and even when communication is temporarily disabled due to a data communication abnormality or the like, Based on this request, control is performed such as redistributing data using a resume function from a place where communication is no longer possible.
The data management unit 32 stores and manages the video content files 31a to 31c for distribution.

  The communication control unit 41 of the videophone mobile devices 40 a to 40 d performs communication control with the video conversion server 10. The input control unit 42 performs a desired input operation by the user. The videophone control unit 43 performs control to receive video content data from the video conversion server 10. The screen control unit 44 performs control to output audio and video based on the received video content data from a speaker (not shown) and display it on the screen.

Next, in the mobile communication video distribution system 1 having such a configuration, the operation when viewing video content with a videophone mobile device will be described with reference to the flowchart shown in FIG. 4 and the sequence diagram shown in FIG. .
First, in step S1 of FIG. 4, the user assigns the number of the video conversion server 10 and the number assigned to the video content to be viewed (assigned to the above-mentioned URL) from the keypad 46 of the videophone mobile device 40a. Suppose that a videophone connection request (call connection request) is made.

By this call, as shown in step T1 of FIG. 5, a call connection request signal is transmitted to the video conversion server 10, and the videophone mobile device 40a is connected to the video conversion server 10. This connection is performed by communication control between the communication control unit 41 of the videophone mobile device 40a and the communication control unit 11 of the video conversion server 10.
At the time of this connection, the video conversion server 10 confirms the address by the telephone number of the videophone mobile device 40a. When this is completed, an address completion notice is transmitted to the videophone mobile device 40a in step T2, and in step T3. A signal for notifying the videophone mobile device 40a of the ringing sound is transmitted.

  In addition, the number of video content to be viewed is transmitted from the videophone mobile device 40 a to the video conversion server 10 by the connection, and this number is notified to the address management unit 13. The address management unit 13 converts the URL of the content to be accessed with respect to the telephone number input by the videophone mobile device 40a, and obtains the URL where the corresponding content is stored.

Then, in step T4 (step S2 in FIG. 4), connection is made to the Web server 30a having the previously obtained URL under the control of the inter-server communication control unit 12 of the video conversion server 10, and in step T5, the video content Download starts. That is, the video content file and its header information are downloaded to the video conversion server 10 from the Web server 30a.
Here, as shown in steps S3 and S4 of FIG. 4, if acquisition of the header part (header information) is not successful, the connection call with the videophone mobile device 40a is disconnected without charge in step S5.

  On the other hand, when the header information is acquired, the header information is checked in step S6. That is, in the video conversion server 10, simultaneously with the downloading of the video content data shown in step T5 of FIG. 5, the header information of the video content data is controlled by the file header control unit 14 in step T6 (step S6 in FIG. 4). Are checked (for example, the elements shown in FIG. 3).

  If it is determined by this check that there is a problem (problem) in the header element, that is, if the video content data is problematic when video distribution is performed to the videophone mobile device 40a, The data is not distributed, the video phone mobile device 40a is notified that the video content data is abnormal, and the call is disconnected without charge in step S5 of FIG.

  On the other hand, if it is determined that there is no problem in the header element, the acquisition of the data part of the video content is started under the control of the video data control unit 15. If the acquisition is not successful in step S8, in step S9. It is determined whether or not the video content file has ended due to damage or non-existence. If it is the end of the file, the call is disconnected without charging in the same manner as described above in step S5, and if it is not the end of the file, data is reacquired a predetermined number of times in step S10. As a result, if it is not reacquired, the call is disconnected without charge in the same manner as described above in step S5. When the data is acquired again, similarly to the case of successful data acquisition in step S8, the processes of steps S11 to S13 described below are executed.

That is, as shown in step T7 of FIG. 5, the process of converting the acquired video content data into the videophone mobile device format in step T8 is performed.
Here, the video content data itself received from the Web server 30a does not include information on when audio or video is played back. However, since it is necessary to synchronize the video and audio for the data distributed to the videophone mobile device 40a, the data stored in the buffer of the video data control unit 15 once for each data of the audio and video. In S11, reproduction time information is given by the time information calculation unit 16.

  That is, in the case of video data, the time information includes the sampling rate information (vop_time_increment_resolution) included in the header and the time information (modulo_time_base and vop_time_increment) included in the header of the received data, and the time information of the previous data is added. Calculated from the results. That is, the sampling rate for receiving the video data is sequentially accumulated and given to the video data as time information.

In the case of audio data, the data is always arranged every 20 ms in the file format, so that 20 ms is sequentially accumulated and given to each audio data as time information.
Next, in step S12, the audio / video synchronization control unit 17 synchronizes the audio data with the video data to which time information is added as described above. For example, assuming that time information increasing every 1 ms is added to video data, synchronization is performed by associating one audio data with every 20 ms of video data.

In step S13, the audio / video multiplexing control unit 18 multiplexes the synchronized audio and video data. This is an ITU-TH.3 standard for audio / video data multiplexing for videophone mobile devices. Multiplexing is performed in a format according to the H.223 protocol.
The multiplexed data is distributed to the videophone mobile device 40a in step S14. That is, as shown in step T9 in FIG. 5, the video / audio multiplexed data is distributed to the videophone mobile device 40a. The video / audio multiplexed data is received under the control of the videophone control unit 43 of the videophone mobile device 40a, and is displayed so as to be viewable by the user under the control of the screen control unit 44.

  Further, since the file size of the video content is notified from the Web server 30a when the video content data is downloaded as in step T7, the video data control unit 15 causes the video conversion server 10 to download the downloaded video. The cumulative value of the content data amount is managed, and it is determined whether or not the content download has been completed by checking whether or not this value has reached the file size. If it is determined that the download has been completed, as shown in step T10, the video / audio multiplexed data buffered and converted before this determination is all delivered to the videophone mobile device 40a. The call is disconnected for billing.

Next, the operation when the communication session between the video conversion server 10 and the Web server 30a is disconnected due to a temporary failure of the network device of the mobile communication network 20 will be described with reference to the flowchart of FIG. .
The video conversion server 10 accumulates the amount of video content data received from the Web server 30a as described above. Therefore, as shown in step T21, when the communication session disconnection occurs in the video conversion server 10, the video data control unit 15 shows in step T22 based on the accumulated value of the data amount of the video content acquired before the disconnection. As described above, a request for data (HTTP GET to which the range header is added) to the video content data before cutting is made to the Web server 30a.

  As shown in steps T23 and T24, the Web server 30a transmits the file size of the continuous data based on the request and the data under the control of the data management unit 32. In the same manner as in step T8, the continuous video content data is converted into videophone mobile device data, which is distributed to the videophone mobile device 40a.

  As described above, according to the mobile communication video distribution system 1 of the present embodiment, the video conversion server 10 is connected between the Web servers 30a to 30c and the videophone mobile devices 40a to 40d. When the video content data requested by the videophone mobile device 40a is received from the Web server 30a, the video content data is received if the header information is not defective, and the video constituting the video content data is received after the reception. After calculating the reproduction time information of each of the data and the audio data, and synchronizing the video data and the audio data based on the reproduction time information, both are multiplexed by the videophone mobile device multiplexing standard and the videophone It was made to transmit to the mobile device 40a.

As a result, even in a wireless environment where the error rate is very high, video content for a long time can be received by the videophone mobile device 40a of the mobile communication network 20 and viewed well.
If the video conversion server 10 has a defect in the header information of the video content data received from the Web server 30a, the video phone mobile device 40a is notified of the abnormality and the call connection with the video phone mobile device 40a is disconnected. I tried to do it.

  As a result, if the header information is defective, the call connection with the videophone mobile device 40a is disconnected, so that the video content data is not properly downloaded from the Web server 30a, or the video content data itself. If there is an abnormality, the malfunction can be detected quickly and the call connection with the videophone mobile device 40a can be disconnected, thereby preventing unnecessary communication.

Also, the video conversion server 10 manages the cumulative value of the video content data received from the Web server 30a, and when the communication with the Web server 30a is disconnected, the data amount before the disconnection is stored. Based on the accumulated value, a request for data to be continued from the video content data before cutting is made to the Web server 30a.
Thus, even if the video conversion server 10 is disconnected from the Web server 30a for some reason, the video content data continued from the video content data received before the disconnection can be received from the Web server 30a. Data can be continuously distributed to the videophone mobile device 40a.
As described above, the video content stored on the Web servers 30a to 30c can be viewed on the videophone mobile devices 40a to 40d, and can be viewed without depending on the length of the video content.

It is a block diagram which shows the structure of the mobile communication video delivery system which concerns on embodiment of this invention. It is a block diagram which shows the structure of the video conversion server in the said mobile communication video delivery system, a web server, and a videophone mobile device. It is a figure which shows an example of the check element of the header information of the video content data transmitted from the said Web server to a video conversion server, and a check content. It is a flowchart for demonstrating the operation | movement at the time of viewing and listening to video content with a videophone mobile station in the said mobile communication video delivery system. It is a sequence diagram showing a signal flow when viewing video content with a videophone mobile device in the mobile communication video distribution system. It is a sequence diagram which shows the flow of a signal when the communication session between a video conversion server and a web server is cut | disconnected in the said mobile communication video delivery system.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Mobile communication video delivery system 10 Video conversion server 11 Communication control part 12 Inter-server communication control part 13 Address management part 14 File header control part 15 Video data control part 16 Time information calculation part 17 Audio video synchronization control part 18 Audio video multiplexing Control unit 20 Mobile communication network 30a-30c Web server 31a-31c Video content file 31 Communication control unit 32 Data management unit 40a-40d Videophone mobile device 41 Communication control unit 42 Input control unit 43 Videophone control unit 44 Screen control Part

Claims (5)

Mobile communication video distribution enabling video content to be viewed by receiving video content data consisting of audio data and video data stored in a Web server by a mobile communication terminal equipped with a videophone function of the mobile communication network In the system,
First communication control means for communicating and connecting to the Web server storing video content in response to a request from the mobile communication terminal and receiving header information of the requested video content data from the Web server;
By checking the received header information, if the header information is not defective, the video content data is received and buffered, and if there is a defect, the mobile communication terminal is notified of the abnormality and the movement When the call connection with the communication terminal is disconnected, the cumulative value of the amount of video content data received from the Web server is managed, and the communication is disconnected when the communication with the Web server is disconnected. Second communication control means for making a request for data to be continued to the video content data before disconnection to the Web server based on a cumulative value of the previous data amount;
The reproduction time information of the video data in the video content data is calculated based on the sampling rate information included in the header information of the buffered video content data, and the predetermined arrangement time interval of the audio data in the video content data Time information calculating means for calculating reproduction time information of the audio data from
Synchronization control means for synchronizing the video data and audio data based on the reproduction time information of the video data and audio data;
Multiplexing control means for multiplexing the synchronized video data and audio data in accordance with a videophone mobile terminal multiplexing standard and transmitting the multiplexed data to the mobile communication terminal in the mobile communication network. A mobile communication video distribution system characterized by being deployed. Video content data consisting of audio data and video data stored on a Web server can be transmitted to a mobile communication terminal equipped with a videophone function via a mobile communication network, and video content can be viewed on the mobile communication terminal. In the video conversion server
First communication control means for communicating and connecting to the Web server storing video content in response to a request from the mobile communication terminal and receiving header information of the requested video content data from the Web server;
A second communication control means for receiving and buffering corresponding video content data when the received header information is not defective by checking the received header information;
Based on the sampling rate information included in the header information of the received video content data, the reproduction time information of the video data in the video content data is calculated, and from the specified arrangement time interval of the audio data in the video content data Time information calculating means for calculating reproduction time information of the audio data;
Synchronization control means for synchronizing the video data and audio data based on the reproduction time information of the video data and audio data;
Multiplexing control means for performing control to multiplex the synchronized video data and audio data in accordance with a videophone mobile station multiplexing standard and transmit the multiplexed data to the mobile communication terminal. Conversion server. The said 2nd communication control means notifies an abnormality to the said mobile communication terminal when there is a malfunction in the said header information, The call connection with this mobile communication terminal is cut | disconnected. The described video conversion server. The second communication control unit manages a cumulative value of the amount of video content data received from the Web server, and when the communication with the Web server is disconnected, the amount of data before the disconnection 4. The video conversion server according to claim 2, wherein a request for data to be continued from the video content data before cutting is made to the Web server based on the cumulative value of the video. Video content data consisting of audio data and video data stored on a Web server can be transmitted to a mobile communication terminal equipped with a videophone function via a mobile communication network, and video content can be viewed on the mobile communication terminal. In the mobile communication video distribution method
A first step of communication-connecting to the web server storing video content in response to a request from the mobile communication terminal and receiving header information of the requested video content data from the web server;
By checking the header information received in the first step, if the header information is not defective, the video content data is received and buffered, and if there is a defect, the mobile communication terminal is abnormal. And a second step of disconnecting the call connection with the mobile communication terminal,
The cumulative value of the video content data received in the second step is managed, and when communication with the Web server is disconnected, based on the cumulative value of the data amount before the disconnection, A third step of making a request for data to be continued to the video content data before disconnection to the Web server;
Based on the sampling rate information included in the header information of the video content data received in the second step, the reproduction time information of the video data in the video content data is calculated, and the audio data in the video content data A fourth step of calculating reproduction time information of the audio data from a predetermined arrangement time interval;
A fifth step of synchronizing the video data and the audio data based on the reproduction time information of the video data and the audio data;
A mobile communication video distribution comprising: a sixth step of multiplexing the synchronized video data and audio data in accordance with a videophone mobile terminal multiplexing standard and transmitting the multiplexed data to the mobile communication terminal. Method.

Images