[FFmpeg-trac] #9453(undetermined:new): Overlay with negative x/y produces artefacts
FFmpeg
trac at avcodec.org
Thu Oct 14 14:29:31 EEST 2021
#9453: Overlay with negative x/y produces artefacts
-------------------------------------+-------------------------------------
Reporter: Jozef | Owner: (none)
Chutka |
Type: defect | Status: new
Priority: normal | Component:
| undetermined
Version: 4.3.2 | Resolution:
Keywords: overlay | Blocked By:
Blocking: | Reproduced by developer: 0
Analyzed by developer: 0 |
-------------------------------------+-------------------------------------
Description changed by Jozef Chutka:
Old description:
> Summary of the bug:
>
> Overlaying image/movie over main with alpha channel (see [shape])
> produces ugly artefacts esp. when used with negative x/y.
>
> However, when color=c=0x000000 (no alpha) or x/y is positive there are no
> visible artefacts.
>
> How to reproduce:
>
> {{{
> ffmpeg -filter_complex_script filter.txt -frames:v 1 out.png -y
> }}}
>
> filter.txt:
>
> {{{
> color=c=0xff0000:size=1280x720[main];
> color=c=0x00000000:size=500x500[shape];
> movie=640x640.jpg,[shape]overlay=y=-10,[main]overlay
> }}}
New description:
Summary of the bug:
Overlaying image/movie over main with alpha channel (see [shape]) produces
ugly artefacts esp. when used with negative x/y.
However, when color=c=0x000000 (no alpha) or x/y is positive there are no
visible artefacts.
How to reproduce:
{{{
ffmpeg -filter_complex_script filter.txt -frames:v 1 out.png -y
}}}
filter.txt:
{{{
color=c=0xff0000:size=1280x720[main];
color=c=0x00000000:size=500x500[shape];
movie=640x640.jpg,[shape]overlay=y=-10,[main]overlay
}}}
Actually using ffmpeg 4.4, but this version is not avialble in version
dropdown in this form.
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Ticket URL: <https://trac.ffmpeg.org/ticket/9453#comment:1>
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