[Bug 796495] vaapi{h264,h265}enc: Missing frames when encode with B frames from YUV file and num-buffers specified

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=796495

--- Comment #5 from Fei <fei.w.wang at intel.com> ---
Take a example, if set max-bframes as 4, then encoder need 4 frames in a list
together to encode the 4 B frames per time. If the total frame number can not
divide by 4, then there will be less than 4 frames in list in the end. And the
list will be release and the frames will be drop in it during flush. So one
solution is to change B frame into P frame in flush and re-encode all the
remind frames instead of drop them. But seems it is hard to implement because
encode/flush are called in video encode base class. Any suggestion on this?

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