To remove a section from the start of a video
Use the -ss (start seek) option before the -i (input filename) parameter. The following would trim the first 35 seconds from the start of the video.:
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avconv -ss 35 -i input_filename.MP4 -codec copy output_filename.MP4 |
Using the -codec copy option means it won’t alter the audio/video streams, and means the operation happens is nearly instantly
To trim the end off a video
Use the -t option to specify the number of seconds you want to trim up to from the start of the video. The following would keep just the first 2 minutes of the video:
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avconv -i input_filename.MP4 -codec copy -t 120 output_filename.MP4 |
To keep just a section from the middle of a video
The two options above can be used in conjuntion, i.e. the following would keep 2 minutes of footage, starting at 35 seconds into the original video:
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avconv -ss 35 -i input_filename.MP4 -codec copy -t 120 output_filename.MP4 |