Note: Trimming at this point should be easily understood but for a refresher refer to answers in How to trim ‘x’ seconds from the start of an audio track?.
Trimming a couple of seconds off the end of a track is easy but again requires a different thinking of how time works in FFMPEG. Like trimming from the start of an audio track, trimming from the end of a track uses the argument -t or duration with no seeking.
In this example, the input file is 1 minute long with the requirement of 10 seconds removed from the end:
$ ffmpeg -t 00:00:50 -i input.mp3 -async 1 output.mp3 By setting a smaller time than the actual audio duration, FFMPEG will automatically trim the audio. Now the benefit of manually setting the duration instead of FFMPEG automatically handling it is understandable.
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