This prevents underflows in quite constrained cases
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>

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

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

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

Fixes infinite loop
Fixes Ticket2979
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>

Fixes #2995.
Reported-by: Piotr Bandurski <ami_stuff@o2.pl>
Signed-off-by: Paul B Mahol <onemda@gmail.com>

Fixes infinite loop
Fixes Ticket2987
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>

Prevents infinite loop
Fixes Ticket2988
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>

The only use case of it was the selftest code, and there the slightly more
complex indexing that is needed after its removial doesnt matter.
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>

* qatar/master:
  lavc doxy: document that avcodec_flush_buffers() invalidates decoded frames
Merged-by: Michael Niedermayer <michaelni@gmx.at>

* commit '2725f2d4':
  doc/filters: fix an option name in the unsharp docs

Conflicts:
	doc/filters.texi

See: b7b72963Merged-by: Michael Niedermayer <michaelni@gmx.at>

* commit 'cab8c5f8':
  h264: do not reinitialize the global cabac tables at each slice header

See: 1e2e2c80Merged-by: Michael Niedermayer <michaelni@gmx.at>

* commit 'e8804186':
  cabac: remove write-only h264_mps_state[]

Conflicts:
	libavcodec/cabac.c
Merged-by: Michael Niedermayer <michaelni@gmx.at>

* commit '668643b9':
  matroskadec: check av_strdup() when setting defaults
Merged-by: Michael Niedermayer <michaelni@gmx.at>

Fix infinite loop
Fix Ticket2978
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>

Fixes Ticket2990
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>

Fixes Ticket2972
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>

This is in line with the other functions
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>

This fixes compilation with MSVC and ICL, and makes ffhash consistent
with how the rest of the codebase uses read().
Reviewed-by: Derek Buitenhuis <derek.buitenhuis@gmail.com>
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>

* qatar/master:
  lavc: add support for interleaved chroma formats to libx264.

Conflicts:
	libavcodec/libx264.c

See: 283fb76dMerged-by: Michael Niedermayer <michaelni@gmx.at>

* commit 'a454dec1':
  pixdesc: fix NV20* descriptors
  h264_sei: check SEI size
Merged-by: Michael Niedermayer <michaelni@gmx.at>

* commit '71cabb52':
  h264: do not discard NAL_SEI when skipping frames

Conflicts:
	libavcodec/h264.c

See: 7d75fb38Merged-by: Michael Niedermayer <michaelni@gmx.at>

* commit 'edaba180':
  h264: log extradata skip only for non-ignored NALs

Conflicts:
	libavcodec/h264.c
Merged-by: Michael Niedermayer <michaelni@gmx.at>

* commit '26179964':
  h264_sei: log unknown sei messages

Conflicts:
	libavcodec/h264_sei.c
Merged-by: Michael Niedermayer <michaelni@gmx.at>

* commit '5f24fe82':
  mpegvideo: Initialize chroma_*_shift and codec_tag even if the size is 0

Conflicts:
	libavcodec/mpegvideo.c

The chroma_*_shift and codec_tag code was not under a size!=0 check in ffmpeg
Merged-by: Michael Niedermayer <michaelni@gmx.at>

* commit 'd6d27f3e':
  configure: Enable -Qansi-alias for icl 14+
Merged-by: Michael Niedermayer <michaelni@gmx.at>

Interleaved chroma is x264's native format
Signed-off-by: Anton Khirnov <anton@khirnov.net>

They were inconsistent (overlapping fields and wrong sizes)
Signed-off-by: Anton Khirnov <anton@khirnov.net>

Setting AVDISCARD_NONREF (e.g. after flushing) resulted in 100% dropped frames.
Signed-off-by: Anton Khirnov <anton@khirnov.net>

Signed-off-by: Anton Khirnov <anton@khirnov.net>

Signed-off-by: Anton Khirnov <anton@khirnov.net>

Signed-off-by: Anton Khirnov <anton@khirnov.net>

This fixes breakage in a few fate tests on certain setups
(that for some reason didn't break on OS X) after the previous
commit (8812a805). Currently, some video streams are initialized
in ff_MPV_common_init with width/height set at 0 and only changed
to a proper video size with ff_MPV_common_frame_size_change later.

The breakage was diagnosed by Anton Khirnov.
Signed-off-by: Martin Storsjö <martin@martin.st>

Qansi-alias worked on 12.x, then caused miscompilation on 13.x, but now
works again passing all FATE tests for icl version 14.
Signed-off-by: Diego Biurrun <diego@biurrun.de>

* qatar/master:
  h263dec: Remove a hack that can cause infinite loops

Conflicts:
	libavcodec/h263dec.c

See: d2981b8eMerged-by: Michael Niedermayer <michaelni@gmx.at>