[FFmpeg-devel] [PATCH] Add alphaextract, alphamerge filters

[Michael Niedermayer]

On Fri, Jul 20, 2012 at 11:29:18AM +0200, Stefano Sabatini wrote:
> On date Thursday 2012-07-19 21:43:31 -0700, Steven Robertson encoded:
> > On Thu, Jul 19, 2012 at 12:56 AM, Stefano Sabatini <stefasab at gmail.com> wrote:
> [...]
> > > Also why are you copying the entire line, rather than just the image
> > > data?
> > 
> > So that the filters will work with 16-bit data just by extending the
> > pad configuration (which I may look into soon).
> 
> Can you elaborate on this (and provide an use case)?
> 
> [...]
> > From af200d4fdfe2997600b6f3924500cdeb34ae6cd2 Mon Sep 17 00:00:00 2001
> > From: Steven Robertson <steven at strobe.cc>
> > Date: Tue, 10 Jul 2012 22:14:57 -0700
> > Subject: [PATCH] Add alphaextract, alphamerge filters.
> > 
> > These filters are designed for storing and transmitting video sequences
> > with alpha using higher-efficiency codecs such as x264 which don't
> > natively support an alpha channel. 'alphaextract' takes an input stream
> > with an alpha channel and returns a video containing just the alpha
> > component as a grayscale value; 'alphamerge' takes an RGB or YUV stream
> > and adds an alpha channel recovered from a second grayscale stream.
> > 
> > Signed-off-by: Steven Robertson <steven at strobe.cc>
> > ---
> >  doc/filters.texi                 |  25 +++++
> >  libavfilter/Makefile             |   2 +
> >  libavfilter/allfilters.c         |   2 +
> >  libavfilter/vf_alphaextract.c    | 117 ++++++++++++++++++++++
> >  libavfilter/vf_alphamerge.c      | 208 +++++++++++++++++++++++++++++++++++++++
> >  tests/lavfi-regression.sh        |  15 ++-
> >  tests/ref/lavfi/alphaextract_rgb |   1 +
> >  tests/ref/lavfi/alphaextract_yuv |   1 +
> >  tests/ref/lavfi/alphamerge_rgb   |   1 +
> >  tests/ref/lavfi/alphamerge_yuv   |   1 +
> >  10 files changed, 370 insertions(+), 3 deletions(-)
> >  create mode 100644 libavfilter/vf_alphaextract.c
> >  create mode 100644 libavfilter/vf_alphamerge.c
> >  create mode 100644 tests/ref/lavfi/alphaextract_rgb
> >  create mode 100644 tests/ref/lavfi/alphaextract_yuv
> >  create mode 100644 tests/ref/lavfi/alphamerge_rgb
> >  create mode 100644 tests/ref/lavfi/alphamerge_yuv
> 
> Patch looks good.

will you apply it or is there something to wait for or should i apply ?

[...]
-- 
Michael     GnuPG fingerprint: 9FF2128B147EF6730BADF133611EC787040B0FAB

While the State exists there can be no freedom; when there is freedom there
will be no State. -- Vladimir Lenin
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