On 2025-09-15 12:44 am, Michael Koch via ffmpeg-user wrote:
like this video:
https://www.youtube.com/watch?v=LsxJe6yW0QU
I did make it with geq filter, but that's extremely slow because the same
function must be calculated for each pixel.
One method that comes to mind is to use scale+crop cascade
scale=eval=frame:h=ih:w=f1(t),crop=W:H,scale=eval=frame:w=iw:h=f2(t),crop=W:H
Make sure that no resultant frame from scale produces a frame smaller
than WxH, so pad first if needed.
Regards,
Gyan
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