[FFmpeg-devel] [PATCH] libvpx: Enable vp9 alpha encoding

[Ronald S. Bultje]

Hi,

On Fri, Jul 1, 2016 at 12:23 PM, Vignesh Venkatasubramanian <
vigneshv-at-google.com at ffmpeg.org> wrote:

> On Thu, Jun 30, 2016 at 10:37 PM, James Zern
> <jzern-at-google.com at ffmpeg.org> wrote:
> > On Thu, Jun 30, 2016 at 4:16 PM, Vignesh Venkatasubramanian
> > <vigneshv-at-google.com at ffmpeg.org> wrote:
> >> Chrome canary now supports decoding of VP9 streams with alpha
> >> channel [1]. Add support to ffmpeg for creating such files.
> >>
> >> [1] https://codereview.chromium.org/2096813002/
> >>
> >> Signed-off-by: Vignesh Venkatasubramanian <vigneshv at google.com>
> >> ---
> >>  libavcodec/libvpx.c    | 3 +++
> >>  libavcodec/libvpxenc.c | 1 +
> >>  2 files changed, 4 insertions(+)
> >>
> >
> > Wasn't there a vp8+alpha webm in fate?
>
> yes, there is one under vp8_alpha directory. but the test is very weak
> as it just does a -c copy and checks if the output has blockadditional
> data. if you want, i can replicate the same for vp9. let me know.


Do we have decoder support (for either vp8 or vp9) for these files? Using
either libvpx or ffvp8/9? My impression is no.

Ronald