QtAVPlayer
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Perf issue
"sws_flags=neighbor;[0:a:0]showwaves=mode=p2p:n=2:s=720x480:split_channels=0,negate[z2];[0:v:0][z2]xstack=layout=0_0|w0_0"
https://github.com/valbok/QtAVPlayer/pull/248
some fixes landed to have more correct decoding, when frames are not skipped