incomplete keyframes on motion

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incomplete keyframes on motion

Hi all,
I'm trying to add H263 video support in my win32 VoIP client projectusing
precompiled dlls of avcodec (avcodec-51.dll,
avformat-51.dll,avutil-49.dll). When the sender A encode the video
streaming withAVFrame.quality >= 900 and send it via RTP to B, the receiver
Bdecode the streaming very well, but if the sender A encode
withAVFrame.quality < 900 (ie. 200) the receiver B displays
incompletekeyframes when there's some motion in the captured image (it's
hard toexplain!). This dll files works fine onanother VoIP software client

Please see the decoded screenshots:

where i'm wrong?

thanks... and sorry for my english

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