[FFmpeg-devel] [PATCH v11 4/8] libavcodec/webp: add support for animated WebP

[Thilo Borgmann]

On 17.04.24 19:30, James Zern via ffmpeg-devel wrote:
> On Thu, Mar 28, 2024 at 7:10 AM Thilo Borgmann via ffmpeg-devel
> <ffmpeg-devel at ffmpeg.org> wrote:
>>
>> From: Josef Zlomek <josef at pex.com>
>>
>> Fixes: 4907
>>
>> Adds support for decoding of animated WebP.
>>
>> The WebP decoder adds the animation related features according to the specs:
>> https://developers.google.com/speed/webp/docs/riff_container#animation
>> The frames of the animation may be smaller than the image canvas.
>> Therefore, the frame is decoded to a temporary frame,
>> then it is blended into the canvas, the canvas is copied to the output frame,
>> and finally the frame is disposed from the canvas.
>>
>> The output to AV_PIX_FMT_YUVA420P/AV_PIX_FMT_YUV420P is still supported.
>> The background color is specified only as BGRA in the WebP file
>> so it is converted to YUVA if YUV formats are output.
>>
>> Signed-off-by: Josef Zlomek <josef at pex.com>
>> ---
>>   Changelog               |   1 +
>>   libavcodec/codec_desc.c |   3 +-
>>   libavcodec/version.h    |   2 +-
>>   libavcodec/webp.c       | 710 ++++++++++++++++++++++++++++++++++++----
>>   4 files changed, 653 insertions(+), 63 deletions(-)
>>
> 
> I'm late trying to test these. I think these need to be rebased.
> version.h is easy enough to skip. I didn't look at the conflict in
> webp.c.
> 
> error: patch failed: libavcodec/version.h:30
> error: libavcodec/version.h: patch does not apply
> error: patch failed: libavcodec/webp.c:35
> error: libavcodec/webp.c: patch does not apply
> Patch failed at 0004 libavcodec/webp: add support for animated WebP

just posted v12 which applies to master again, also tagged it WIP.

Thanks for having a look,
Thilo