#9680: scale2ref is one frame behind
-------------------------------------+-------------------------------------
Reporter: Jozef | Type: defect
Chutka |
Status: new | Priority: normal
Component: | Version:
undetermined | unspecified
Keywords: scale2ref | Blocked By:
Blocking: | Reproduced by developer: 0
Analyzed by developer: 0 |
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Summary of the bug:
When using scale2ref filter with dynamic ref size, the resized element
does not match the ref exactly (lags 1 frame?)
In the following example [w]hite rect grows 1px every frame and [r]ed
tries to match. However when rendered on top of each other, the red one is
1px smaller leaving 1px white border around.
{{{
ffmpeg -filter_complex
"color=color=#000000:rate=20:size=400x400[b];color=color=#ffffff:rate=20:size=100x100,scale=width=iw+n:height=ih+n:eval=frame[w];color=color=#ff0000:rate=20[r];[r][w]scale2ref=eval=frame[r][w];[w][r]overlay[w];[b][w]overlay"
-t 4 -y gif.mp4
}}}
ffmpeg version 2022-02-24-git-8ef03c2ff1-full_build-www.gyan.dev
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Ticket URL: <https://trac.ffmpeg.org/ticket/9680>
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