GNU/Linux Desktop Survival Guide by Graham Williams
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Crop a Video

Here we crop the input video from the beginning to 11.6 seconds in:

$ ffmpeg -i input.mp4 -ss 00:00:00 -t 00:00:11.6 -async 1 cut.mp4

To extract a particular section of the avi file (starting at 7 minutes and 20 seconds into the video and stopping at 8 minutes and 20 seconds):

$ avisplit -i a.avi -t 0:7:20.0-0:8:20.0

To extract a particular section of a video and convert it to a sequence of png files (screenshots):

$ avisplit -i a.avi -t 0:9:14.0-0:9:16.0
$ mplayer -vo png a.avi-0000

This generates about 100 png files. An alternative is to use the Take Screenshot option under Edit in totem.