#2275: artifacts on decoding PNG file with alpha
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Reporter: saste | Owner:
Type: defect | Status: closed
Priority: normal | Component: FFplay
Version: git-master | Resolution: invalid
Keywords: png alpha sdl | Blocked By:
Blocking: | Reproduced by developer: 1
Analyzed by developer: 1 |
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Changes (by saste):
* analyzed: 0 => 1
* keywords: png alpha => png alpha sdl
* status: open => closed
* component: avcodec => FFplay
* resolution: => invalid
Comment:
Replying to [comment:2 cehoyos]:
> Is there really an issue?
> ImageMagick decodes exactly the same (invisible) artefacts as FFmpeg.
Indeed it isn't.
{{{
ffplay -f lavfi "color=s=400x300:c=white[bg]; movie=ffmpeg-logo.png, [bg]
overlay"
}}}
or
{{{
ffplay ffmpeg-logo.png -vf alphaextract
}}}
libswscale is stripping the alpha plane when converting from RGBA to YUV,
and the display is the natural result of this operation, the only sane
path would be to make the output device support alpha, but this is
unrelated to FFmpeg.
Sorry for the noise.
--
Ticket URL: <https://ffmpeg.org/trac/ffmpeg/ticket/2275#comment:3>
FFmpeg <http://ffmpeg.org>
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