[FFmpeg-user] Treating video frame-based instead of time-based

[Carl Eugen Hoyos]

2019-01-21 9:31 GMT+01:00, Wolfgang Hugemann <auto at hugemann.de>:
> Is ist possible to treat video frame-based instead of time-based,
> analogously to a frameserver such as AVIsynth?

I may misunderstand but FFmpeg treats all video as frame-based.

> Concretely:
> * Could I (easily) extract every nth frame from a video (in order to
> dump the result as JPEGs)?

See the select or the fps filter or use a low output frame rate (which
forces frame drops).

> * Could I subtract each frame from its predecessor (in order to detect
> minimal motion)?

I suspect there is a filter, maybe blend?

Carl Eugen