doc/codecs: extend documentation for thread_type option

Based on avcodec.h documentation.
lavc/h264_slice: clarify informational message in case of disabled slice multi-threaded decoding

Also suggest what can be done to workaround the limitation.
lavc: add a convenience function for rescaling timestamps in a packet
Use av_packet_rescale_ts() to simplify code.
dvenc: initialize the profile only once, at init

We do not allow the frame parameters to change during encoding, so there
is no need to do this for each frame.
dv: get rid of global non-const tables

Instead, store them in the context and compute on each parameter change.
dv: cosmetics, reindent
doc: remove RELEASE_NOTES

It hasn't been used since 0.11, and it does not contain any useful
information except for the code name.

Signed-off-by: Timothy Gu <timothygu99@gmail.com>
Reviewed-by: Clément Bœsch <u@pkh.me>
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
configure: remove superfluous check for AVX/FMA3 support in Yasm

The minimum Yasm/NASM version required to compile ffmpeg supports both
instruction sets

Signed-off-by: James Almer <jamrial@gmail.com>
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
Add av_image_check_sar() and use it to validate SAR
Merge commit '874390e163427c1fe7682ab27924a7843780dbb3'

* commit '874390e163427c1fe7682ab27924a7843780dbb3':
  lavc: add a convenience function for rescaling timestamps in a packet

Conflicts:
	libavcodec/version.h

Merged-by: Michael Niedermayer <michaelni@gmx.at>
Merge commit '452860d7e056f9a894cac2fe52cdedeae4c38251'

* commit '452860d7e056f9a894cac2fe52cdedeae4c38251':
  Use av_packet_rescale_ts() to simplify code.

Conflicts:
	doc/examples/muxing.c
	ffmpeg.c

Merged-by: Michael Niedermayer <michaelni@gmx.at>
Merge commit '778111592bf5f38630858ee6dfcfd097cd6c6da9'

* commit '778111592bf5f38630858ee6dfcfd097cd6c6da9':
  dvenc: initialize the profile only once, at init

Conflicts:
	libavcodec/dvenc.c

Merged-by: Michael Niedermayer <michaelni@gmx.at>
Merge commit '650dee63c8b1e6693c6cf5983f4a5ed3f571379f'

* commit '650dee63c8b1e6693c6cf5983f4a5ed3f571379f':
  dv: get rid of global non-const tables

Conflicts:
	libavcodec/dv_profile.h
	libavcodec/dvdec.c
	libavcodec/dvenc.c

Merged-by: Michael Niedermayer <michaelni@gmx.at>
Merge commit 'd349afb07bacccb62eb5369c38d6406d2909d792'

* commit 'd349afb07bacccb62eb5369c38d6406d2909d792':
  dv: cosmetics, reindent

Merged-by: Michael Niedermayer <michaelni@gmx.at>
h264: fix build when error resilience is disabled
fix several typos
avcodec/wavpackenc: fix () in macros

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
avcodec/x86/rv40dsp_init: fix () in macros

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
avcodec/bitstream: try to workaround internal compiler bug in gcc 4.2

gcc 4.2 seems not maintained anymore so theres no option besides
just working around it.

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>