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We’re trying to edit a video with FFmpeg. One of our videos has an alpha channel and we want to superimpose this above another video.

example:

Video 01: Start frame 1     end frame 200
Video 02: Start frame 100   end frame 300 

A common function within video editing software is working with multiple layers. So far we haven't been able to find such a function within FFmpeg.

Does anyone know how to do this? Any suggestion is welcome! (or if you know any other way to do this trough a unix command line we'd be glad to know)

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migrated from stackoverflow.com Dec 4 '12 at 16:22

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Sure, there's an overlay filter. Make sure you run a recent version of FFmpeg. –  slhck Dec 4 '12 at 13:54
    
@slhck Sure, the overlay filter works, but we don't know how to time the filter. We want to specify an in- en out- for the filter. So far we haven't been able to find how to do that. –  Jerre Dec 5 '12 at 8:46
    
I suspect you would need to use the sendcmd filter, if you can get your head around it. –  evilsoup Jan 17 '13 at 2:55
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