Hello,
I want to make shotdetections (scene cut) with ffmpeg. (a shot is the
video between 2 cuts)
My syntax knowledge at this time offers to generate only the FIRST FRAME
of each shot. NO LAST FRAME. It would be nice to find also the last
frame of a shot, but anyway this ticket should focus on the threshold
itself.
Actual Syntax to generate shotdetection thumbnails with ffmpeg:
ffmpeg -i <inputvideo> -vf select='gt(scene\,0.7)' -vsync 0 -an
keyframes%03d.jpg
the value "0.7" is the threshold.
A higher one will lead to less scenes thumbails - low sensitivity
A lower one will lead to much more thumbnails - high senisitivity
I mentioned that shotdetection algorythms generally has problems with to
dark scenes, so it would be fine to have a threshold which is DYNAMIC to
find every cut in the video. But my "FFmpeg-Fu" is to weak to find a
solution on my own.
So, is it possible to use a dynamic threshold within ffmpeg scene
detection, and if yes -> how can I do that?
Best Regards
Christoph
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