A video data transmitting system for a videophone, which is characterized in that the system comprises a key frame response module, a video coding module and a video transmitting module; wherein,
the video coding module is used for coding the current video transmission data to generate coded data according to the key frame request signal received by the key frame response module from the opposite terminal, and the coded data is a frame of key frame data.
the video transmitting module is used for transmitting the coded data to the videophone at the opposite terminal after the video coding module generates the coded data.
a video receiving module 18, used for transmitting coded video image data to the videophone at the opposite terminal, including a frame of key frame data after the key frame response module 16 responds the key frame request signal and the video coding module 17 generates the frame of key frame data.
The video coding module is also used for coding all the original video data transmitted to the videophone at the opposite terminal according to the video coding standard, and the key frame data and the offset frame data are ordered regularly.
Step S207: after receiving the command of the key frame response module, the video coding module of the second videophone immediately generates I frame data according to the current video transmission data and inserts the I frame data between the sequences of the I frame data and the P frame data of the image data (an I frame is followed by 50 P frames) normally coded at present.
Step S206: when receiving the key frame request signal transmitted from the first videophone, the key frame response module of the second videophone transmits a command to the video coding module of the second videophone.
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