Fix Ticket #4843

Github: Closes #144

The first just does the blending and wouldnt do anything with the colorspace values
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>

Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>

The alpha channel in the fate sample contains random trash, not alpha
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>

the available BGRA samples contain random trash in the alpha channel
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>

BGRA BMPs commonly do contain an all transparent alpha channel
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>

Its illogic to handle gray differently depending on the existence of an alpha channel
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>

Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>

Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>

Also disable the mmx/iwht optimization when the bitexact flag is set.
With synthetically coded coefficients (i.e. these that lead to a
residual well outside the [-255,255] range), our optimizations will
overflow. It doesn't make sense to fix the overflows, since they can
only occur on synthetic input, not on real fwht-generated input. Thus,
add a bitexact flag that disables this optimization.

Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>

Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>

Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>

File libopenh264enc.c has been modified so that the encoder uses av_log()
to log messages (error, warning, info, etc.) instead of logging them
directly to stderr.  At the time the encoder is created, the current
ffmpeg log level is mapped to an equivalent libopenh264 log level.  This
log level, and a message logging function that invokes av_log() to
actually log messages, are then set on the encoder.
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>

Fixes CID 1322364, CID 1322363
Signed-off-by: Vesselin Bontchev <vesselin.bontchev@yandex.com>

Signed-off-by: James Almer <jamrial@gmail.com>

Signed-off-by: James Almer <jamrial@gmail.com>

Fixes linking in FFMS and f265 at least, when ffmpeg is compiled with
libsoxr.
Signed-off-by: Ricardo Constantino <wiiaboo@gmail.com>
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>

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

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

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

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

This commit changes a few things about the noise substitution
logic:
 - Brings back the quantization factor (reduced to 3) during
   scalefactor index calculations.
 - Rejects any zeroed bands. They should be inaudiable and it's
   a waste transmitting the scalefactor indices for these.
 - Uses swb_offsets instead of incrementing a 'start' with every
   window group size.
 - Rejects all PNS during short windows.
Overall improves quality. There was a plan to use the lfg system
to create the random numbers instead of using whatever the decoder
uses but for now this works fine. Entropy is far from important here.
Signed-off-by: Rostislav Pehlivanov <atomnuker@gmail.com>

* commit '3b8e8952':
  codec_desc: Add missing DXV entry
Merged-by: Hendrik Leppkes <h.leppkes@gmail.com>

No actively maintained linux disto on
https://trac.ffmpeg.org/wiki/Downstreams
uses 2.2 anymore, so it makes no sense to maintain it further
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>

Suggested-by: BBB
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>

Suggested-by: BBB
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>

Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>

Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>