On Mon, Jun 27, 2022 at 9:48 AM James Almer <jamr...@gmail.com> wrote: > > On 6/27/2022 1:43 PM, Vignesh Venkatasubramanian wrote: > > On Tue, Jun 21, 2022 at 10:12 AM Vignesh Venkatasubramanian > > <vigne...@google.com> wrote: > >> > >> On Mon, Jun 13, 2022 at 10:17 AM James Zern > >> <jzern-at-google....@ffmpeg.org> wrote: > >>> > >>> On Wed, Jun 1, 2022 at 11:06 AM Vignesh Venkatasubramanian > >>> <vigneshv-at-google....@ffmpeg.org> wrote: > >>>> > >>>> AVIF specification allows for alpha channel as an auxiliary item (in > >>>> case of still images) or as an auxiliary track (in case of animated > >>>> images). Add support for both of these. The AVIF muxer will take > >>>> exactly two streams (when alpha is present) as input (first one being > >>>> the YUV planes and the second one being the alpha plane). > >>>> > >>>> The input has to come from two different images (one of it color and > >>>> the other one being alpha), or it can come from a single file > >>>> source with the alpha channel extracted using the "alphaextract" > >>>> filter. > >>>> > >>>> Example using alphaextract: > >>>> ffmpeg -i rgba.png -filter_complex "[0:v]alphaextract[a]" -map 0 -map > >>>> "[a]" -still-picture 1 avif_with_alpha.avif > >>>> > >>>> Example using two sources (first source can be in any pixel format and > >>>> the second source has to be in monochrome grey pixel format): > >>>> ffmpeg -i color.avif -i grey.avif -map 0 -map 1 -c copy > >>>> avif_with_alpha.avif > >>>> > >>>> The generated files pass the compliance checks in Compliance Warden: > >>>> https://github.com/gpac/ComplianceWarden > >>>> > >>>> libavif (the reference avif library) is able to decode the files > >>>> generated using this patch. > >>>> > >>>> They also play back properly (with transparent background) in: > >>>> 1) Chrome > >>>> 2) Firefox (only still AVIF, no animation support) > >>>> > >>>> Signed-off-by: Vignesh Venkatasubramanian <vigne...@google.com> > >>>> --- > >>>> libavformat/movenc.c | 188 +++++++++++++++++++++++++++++-------------- > >>>> libavformat/movenc.h | 4 +- > >>>> 2 files changed, 130 insertions(+), 62 deletions(-) > >>>> > >>> > >>> lgtm. > >>> _______________________________________________ > >>> ffmpeg-devel mailing list > >>> ffmpeg-devel@ffmpeg.org > >>> https://ffmpeg.org/mailman/listinfo/ffmpeg-devel > >>> > >>> To unsubscribe, visit link above, or email > >>> ffmpeg-devel-requ...@ffmpeg.org with subject "unsubscribe". > >> > >> Any more comments on this? If not can this be merged please? :) > >> > > > > Another ping on this please. > > > >> -- > >> Vignesh > > I thought James Zern had push access, which is why i didn't apply it as > soon as he reviewed it. Sorry. > > Pushed it now. >
Thanks! _______________________________________________ > ffmpeg-devel mailing list > ffmpeg-devel@ffmpeg.org > https://ffmpeg.org/mailman/listinfo/ffmpeg-devel > > To unsubscribe, visit link above, or email > ffmpeg-devel-requ...@ffmpeg.org with subject "unsubscribe". -- Vignesh _______________________________________________ ffmpeg-devel mailing list ffmpeg-devel@ffmpeg.org https://ffmpeg.org/mailman/listinfo/ffmpeg-devel To unsubscribe, visit link above, or email ffmpeg-devel-requ...@ffmpeg.org with subject "unsubscribe".
