Same calculation as for RGBA etc to create unpremultiplied output.
Useful for creating an intermediate "Mix/Effects bank", in vision mixer
(switcher) terminology.

Example command:

ffmpeg -i input.mov -vf
"[in]scale=iw:ih:interl=1,format=yuv420p[bg];movie=BBC_blocks_watermark.png,scale=iw:ih:interl=1,format=yuva420p[dog];movie=Kickabout_strap.mov,scale=iw:ih:interl=1,format=yuva420p[strap];[strap][dog]overlay=0:0[me1];[bg][me1]overlay=0:0,scale=0:0:interl=1[out]"
-b:v 3M -an output.mov

Fix trac ticket #549.
Signed-off-by: Stefano Sabatini <stefasab@gmail.com>

Fixes Ticket1906
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>

Should fix compilation on native windows
We could also use _access() and literal numbers as flags but i cant test it
and the compilation failure should be fixed ASAP
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>

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

Fixes Ticket1904

This should work on windows, but if not please contact me ASAP
i have another idea on how to solve this without access() if that
really doesnt work on windows.

Strongly based on patch by divVerent
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>

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

This fixes issues with negative timestamps
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>

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

Signed-off-by: Paul B Mahol <onemda@gmail.com>

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

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

* qatar/master:
  lavf: avoid integer overflow in ff_compute_frame_duration()
Merged-by: Michael Niedermayer <michaelni@gmx.at>

* commit '5ae72f54':
  flashsv: check for keyframe before using differential coding
  h264: enable low delay only if no delayed frames were seen
  x86: fix build without inline asm

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

* commit '3d3cf674':
  aacdec: use float planar sample format for output

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

* commit '8e134e51':
  lavc: clarify get_buffer() documentation
  mpegaudiodec: use planar sample format for output unless packed is requested
  x86: h264 qpel: use the correct number of utilized xmm regs in cglobal
Merged-by: Michael Niedermayer <michaelni@gmx.at>

Fix compile failure without yasm
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>

Signed-off-by: Peter Ross <pross@xvid.org>
Reviewed-by: Paul B Mahol <onemda@gmail.com>

Signed-off-by: Peter Ross <pross@xvid.org>

Signed-off-by: Peter Ross <pross@xvid.org>
Reviewed-by: Paul B Mahol <onemda@gmail.com>

dpx: perform width/height upgrade and av_image_check_size earlier to prevent segfault on malformed input
Signed-off-by: Peter Ross <pross@xvid.org>

Signed-off-by: Paul B Mahol <onemda@gmail.com>

Signed-off-by: Paul B Mahol <onemda@gmail.com>

Scaling the denominator instead of the numerator if it is too large
loses precision. Fixes an assert caused by a negative frame duration in
the fuzzed sample nasa-8s2.ts_s202310.

CC: libav-stable@libav.org

Fixes a segfault in te fuzzed sample resolutionchange.flv_s211713.

CC: libav-stable@libav.org

Dropping frames is undesirable but that is the only way by which the
decoder could return to low delay mode. Instead emit a warning and
continue with delayed frames.
Fixes a crash in fuzzed sample nasa-8s2.ts_s20033 caused by a larger
than expected has_b_frames value. Low delay keeps getting re-enabled
from a presumely broken SPS.

CC: libav-stable@libav.org

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

Reviewed-by: Paul B Mahol <onemda@gmail.com>
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>

Reviewed-by: Paul B Mahol <onemda@gmail.com>
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>

Based-on: e96d90eeSigned-off-by: Michael Niedermayer <michaelni@gmx.at>

* qatar/master:
  remove #defines to prevent use of discouraged external functions
  x86: h264: Convert 8-bit QPEL inline assembly to YASM

Conflicts:
	libavcodec/x86/dsputil_mmx.c
Merged-by: Michael Niedermayer <michaelni@gmx.at>

The qpel functions referenced here are not related to h264 and should
thus never have been under CONFIG_H264QPEL.
Signed-off-by: Mans Rullgard <mans@mansr.com>
Signed-off-by: Diego Biurrun <diego@biurrun.de>

Signed-off-by: Paul B Mahol <onemda@gmail.com>

This is needed for the AAC decoder, which may need to call get_buffer()
more than once if the channel configuration changes.

* commit 'ad01ba6c':
  x86: h264: Remove 3dnow QPEL code
Merged-by: Michael Niedermayer <michaelni@gmx.at>

Fixes xmm register clobbering on win64.

* commit '28c8e288':
  x86: h264_chromamc: port to cpuflags
  yop: fix typo
  avconv: fix copying per-stream metadata.
  doc: avtools-common-opts: Fix terminology concerning metric prefixes
  configure: suncc: Add compiler arch support for Nehalem & Sandy Bridge
  riff: Make ff_riff_tags static and move under appropriate #ifdef

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

Make the functions av_samples_fill_arrays, av_samples_alloc, and
avcodec_fill_audio_frame return a buffer size rather than 0 in case of
success. This will be enabled at the next libavutil major bump, in order
to preserve backward compatibility.

Returning the size allows to simplify the code, avoiding a few function
calls.

Signed-off-by: Ivan Pozdeev <ivan_pozdeev@mail.ru>
Signed-off-by: Stefano Sabatini <stefasab@gmail.com>