On Mon, Jan 05, 2015 at 12:12:47PM +0100, Robert Nagy wrote: > I want to generate some thumbnails for a video library. > > Currently I'm using: > > -frames:v 1 -filter:v "select=gt(scene\,0.5)" thumb.png > > Which almost works. The problem is that I'd like the thumbnail to be taken > 2 seconds after the scene change have been detected. > > Is there a way to achieve that?
With two steps, and a bit ugly, but you can do something like this: eval $(ffprobe -v error -select_streams v:0 -show_entries frame=best_effort_timestamp_time -of flat=s=_ -f lavfi "movie=in.mov,scale=640:-1,select='gt(scene,0.5)',trim=end_frame=1") And then something like: ffmpeg -i in.mov -ss $[$frames_frame_0_best_effort_timestamp_time+2] -frames:v 1 thumb.png (note: this last command will only work with a shell that supports float arithmetic.) -- Clément B.
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