[FFmpeg-user] Slit-Scan Technique

[Lou]

On Tue, 24 Nov 2015 12:30:45 -0800
Elliott Balsley <elliottbalsley at gmail.com> wrote:

> Does anybody know how to achieve a slit-scan effect with ffmpeg?  It
> can be done in After Effects with the time displacement filter.  The
> way it works, is you take one source video, and one displacement map
> (typically a black-white linear gradient).  Each pixel of the source
> video is offset by some number of seconds based on the luminance of
> the map to create the output.

I don't know, but you can at least make a linear gradient with geq
filter: "geq=lum=255*(Y/H),hue=s=0"

http://ffmpeg.org/ffmpeg-filters.html#geq