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How to control I-Frame size in H263 bitstream?

llx
Beginner
‎03-05-2008 11:29 AM
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Hi,

It seems that I-Frame size in H263 bitstream strongly relies on framerate. Given a QCIF sequence, if set frame interval to 1001 (30fps) in the par file, the I frame size is 2659 bytes; if set frame interval to 4004 (7.5fps) in the par file, the Iframe size become 6110 bytes.

Both 2659 bytes and 6110 bytesa frame are too big for a low bit rate network because one frame will be sent within a few ms which will cause a burst on the network. Some gateways will block this kind of burst. Is there any way to only control the IFrame size without relate to frame rate?

Thanks.

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Vladimir_Dudnik
Employee
‎03-24-2008 01:50 PM
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I think compressed frame size should depend on compression rate

Vladimir

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