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add on_action_suggested callback for qos analyser which receive input and output (decision) of the algorithm

Prefer native over compressed over emulated as long as FPS for requested
resolution is >= 15 images/sec.

But use avcodec_alloc_frame()/avcodec_free_frame()
See https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=699722 for reference.

If a device is capable of YUYV non-emulated format and
YUV420P emulated (cpu color conversion), then pick the
non emulated one.
In the worst case (encoder with no YUYV support), pixconv
will be used to convert YUYV -> YUV420P.
In the best case (encoder supports YUYV input), we skip a
costly color-conversion step.

Allow these filter to specify if they support non-YUV420P
format (e.g: YUYV). If true, feed them with this format instead
of using pixconv.

If some incomplete VP8 frame is left after an iteration of vp8rtpfmt_unpacker_process, keep them for next iteration.

disconnect callbacks from rtp session when AudioStream is destroyed, otherwise they remain in the rtp session, which is kept for further updates of the session (reINVITE)

Force VP8 keyframe on encoder preprocess only when AVPF is enabled + initialize video starter only on first encoder preprocess.

This mechanism is now handled in oRTP by using the RTCP send algorithm defined in the RFC 3550.