[FFmpeg-user] Treating video frame-based instead of time-based
ffmpeg at gyani.pro
Tue Jan 22 07:15:28 EET 2019
On 21-01-2019 02:01 PM, Wolfgang Hugemann wrote:
> * Could I (easily) extract every nth frame from a video (in order to
> dump the result as JPEGs)?
> * Could I subtract each frame from its predecessor (in order to detect
> minimal motion)?
As Carl mentioned, the select filter with an appropriate expression will
do this e.g. select='not(mod(n-1,5))' to select every 5th frame. Frame
count begins with 0.
There is a freezedetect filter in git master that can detect if a frame
has changed minimally with respect to the previous frame. Docs at
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