There is a notion as skip-frame in video coding – the frame which is exactly the same as the previous reference.
In screen coding and in computer graphics generated content skip frames are not uncommon.
How to generate skip-frame in H264 and in HEVC?
Two approaches:
1) P skip frame in H264 can be generated if set all MBs as skipped. In such case motion vector of all MBs is zero. Why? Because the very first MB is skip and its motion vector is zero by default, hence all other MBs inheritates zero motion vectors.
P-skip frame in HEVC is slightly tricky, P-skip can be generated in the same way as in H264, provided that the temporal motion vector prediction is set off, otherwise motion vector from the previous frame is taken (which can be non-zero).
Generation of B-skip frames is irrelevant since B-skip frame can be replaced with P-skip.
2) There is an alternative way to generate skip frames.
If you need the current frame to be skipped then don’t transmit this frame (discard it), but you have to set PTS of next frame to be in the distance of two frame duration.
23+ years’ programming and theoretical experience in the computer science fields such as video compression, media streaming and artificial intelligence (co-author of several papers and patents).
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