On Mon, May 08, 2017 at 02:03:57 +0000, Oleksiy Druzhynin wrote: > If I use multiply -ss options with the same video > > ffmpeg -ss 00:00:05 -i input.mp4 > -ss 00:01:05 -i input.mp4 > -ss 00:03:05 -i input.mp4 > -ss 00:40:05 -i input.mp4 > -map 0:v -frames:v 1 out001.jpg > -map 1:v -frames:v 1 out002.jpg > -map 2:v -frames:v 1 out003.jpg > -map 3:v -frames:v 1 out004.jpg > > The same video would be opened few times or it would be opened just once (for > the optimization and speed-up purpose)?
As far as I know, ffmpeg opens each input separately, and leaves the optimization to the operating system. In your particular case, I wouldn't know how ffmpeg should know to "optimize" this better, as your four output streams need to be available for the output simultaneously. It needs to seek to each of your four offsets, to collect those streams (or frames in your case). I think most OSs can do that just fine. Moritz _______________________________________________ ffmpeg-user mailing list ffmpeg-user@ffmpeg.org http://ffmpeg.org/mailman/listinfo/ffmpeg-user To unsubscribe, visit link above, or email ffmpeg-user-requ...@ffmpeg.org with subject "unsubscribe".
