On 22-01-2019 02:19 PM, Wolfgang Hugemann wrote:
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.
The select filter keeps the framerate, such that the above code will
show every 5th frame for a 5 frame time interval. However this approach
may help to control rounding errors when using the fps filter.
You mentioned that you wished to extract these selected frames as
images. As long as you use -vsync 0, there will be no frame duplication,
and the result is the extraction of every 5th frame. If you want to keep
the selected frames in a video and compact them, then setpts + fps
should be used afterwards to generate a regular CFR video.
Oh, and the correct expression is select='not(mod(n+1,5))'
Gyan
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