Hi Moritz,
Thanks!
Hi Bouke,
On Tue, Aug 25, 2015 at 13:00:40 +0200, Bouke (VideoToolShed) wrote:
assuming that gt(scene\,0.4) will return a number that I could do math
on,
but this fails.
ffmpeg's expressions give the select filter a true/false (take or don't
take this frame) decision. In this case: scene detection shows a change
of 0.4 or more, principally.
Ah, that makes sense!
And to make it more complex, can I also grab a shot out of the middle
of a scene? (that would require to get the current and next
framenumber, subtract and divide by two to an integer and add to the
first...)
I wish I knew. I don't think such a filter exists. Part of the issue is
that ffmpeg would need to look ahead, and buffer a lot of data (which
it does for other filters as well).
Well, in theory it should only have to remember the last frame number...
But this is acedemic, as your solution is way easier.
What you could do is to parse the video for scene changes first,
Ok, this I can do.
calculate the images you want, and present them to the select filter in
the second run.
But, I'm clueless on how to do that?.
(Except restarting FFmpeg for each frame with a -ss)
Btw, is there a -ss option that i can input frames instead of time?
Thanks,
Bouke
Moritz
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