#10901: HEVC with alpha to PNG does not maintain alpha
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Reporter: Jozef Chutka | Type: defect
Status: new | Priority: normal
Component: undetermined | Version: 6.1
Keywords: Hevc alpha | Blocked By:
Blocking: | Reproduced by developer: 0
Analyzed by developer: 0 |
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When converting hevc.mp4 with alpha into PNG, the alpha information is not
respected, producing opaque PNG.
How to reproduce:
{{{
% ffmpeg -i hevc.mp4 -vframes 1 output.png
}}}
hevc.mp4 was created from source image with alpha channel and seems to
have the alpha properly encoded:
{{{
ffmpeg -i source.png -vcodec hevc_videotoolbox -r 1 -t 1 -vtag hvc1
-alpha_quality 1 -y hevc.mp4
}}}
Following https://trac.ffmpeg.org/ticket/7965 which refers to
https://patchwork.ffmpeg.org/project/ffmpeg/patch/tencent_5f1f4da9cfdf5521a752b8c9161a4d23a...@qq.com/
it seems hevcdec has some kind of decoding support for alpha channel... is
it hidden behind some command line flag?
--
Ticket URL: <https://trac.ffmpeg.org/ticket/10901>
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