ffmpeg: set VCFR when copying timestamps

This fixes unreasonable initial frame repeats
Fixes Ticket3176

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
(cherry picked from commit 738ebb4a0e0c8fbdc83b44cf30b8c9b7ac866270)
lavc/srtenc: use bprint for text buffers.

Fix trac ticket #3120.
(cherry picked from commit 4b1c9b720e11d200ca7090210b34c409f43fafeb)
avcodec/h264_refs: split conditions of if() up for better readability

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
(cherry picked from commit ab6ea7a81921a168575be63b3d9049ca716e707a)

Conflicts:
	libavcodec/h264_refs.c
avcodec/h264_refs: improve key frame detection heuristic

Fixes Ticket3186

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
(cherry picked from commit e3d7a3978b857e32b32575ff78ecc7d67a18687e)
avfilter/vf_pad: fix req_end

Fixes out of array accesses
Fixes Ticket3190

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
(cherry picked from commit 0cc5011f9a1b05132f9a20a71feb031f30a8a53b)
avcodec/error_resilience: factor er_supported() check out

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
(cherry picked from commit afb18c55783362546b5e512ce01b7fe7bf5744d9)
avcodec/error_resilience: check that er is supported before attempting to read the status of the previous slice

Fixes incorrectly set error_occured and improves speed

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
(cherry picked from commit 90539cea336fd513c47295a03c164cb4a851166f)
avcodec/cabac: force get_cabac to be not inlined

works around bug in gccs inline asm register assignment
Fixes Ticket3177

gcc from 4.4 to 4.6 is affected at least, no non affected gccs known
clang seems not affected

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
(cherry picked from commit 0538b29ae8002c44f27bae8a1a6fc6e646998be5)