I'm using avcodec_decode_video2() to decode h264 frames encoded by
x264 one frame at a time. The stream is being transmitted over a lossy physical
layer wireless channel prior to decoding. I'm trying to implement logic to
re-display the last good picture if the current picture fails to decode for
whatever reason. The logic I tried was to simply memcpy(lastGoodFrame,
currFrame, sizeof(AVFrame)) each time got_picture_ptr is true and if
got_picture_ptr is false then I display lastGoodFrame instead of currFrame.
However, I'm getting unexpected behavior and blocking patterns. I suspect that
this is due to libav doing interframe prediction decoding. Is this the case? Is
there a way to do what I'm trying to accomplish?
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Hi Tim,
Re-displaying the last picture is probably not what you want to do - at
best your stream will appear frozen with the last good image while the
successive ones are not displayed, and then jump about when correctly decoded
images arrive. I would ascertain just how much data is being lost and where it
happens, if you can, and potentially follow some of the options I previously
posted.
Try your software over your own internal network, i.e. plug all the computers
into their own switch/router. This will then give you an idea if there are
inherent issues with your software, or the network really is a factor, or your
software is not coping too well with a lossy network, or indeed something else.
Good luck with it!
Cheers,
Tony.
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