Revert "rtsp: Factor out fmtp parsing"

This reverts commit c9c1e00f95350e7a36b0d05a03939c7f6438e371.

Conflicts:
	libavformat/rtsp.c
Revert "Revert "lavc/h264_slice: clarify informational message in case of disabled slice multi-threaded decoding""

This reverts commit f41ba30e6ce72f7ea42b84ca9b27d2cfe7e0d87c.
Revert "huffyuv: change statistics initialization"

This reverts commit e7fc5d53a02c07e75a2254839a452e1cbf830d3a.
Revert "lavf/Makefile: fix standalone compilation of live_flv demuxer"

This reverts commit 4c9ee1590febe38e3e4f5fd73bd34300d1e9ec6c.