[FFmpeg-user] Slit-Scan Technique

[Elliott Balsley]

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.

If this is possible with ffmpeg filters, then I’d like to take it a step further and use it with a live video input, from a Decklink.