ffmpeg file trimming

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trim an mp3 file

Example: trim time before 10 seconds and after 10+40=50 seconds, keeping the time in between:

ffmpeg -i input_file.mp3 -c copy -ss 00:00:10 -t 00:00:40 output_filename.mp3

trim a video file

ffmpeg -i videoin.mp4 -c:v libx264 -ss 00:00:10 -t 00:00:40 videoout.mp4
used libx264 to avoid "deadlock buffer" issue on playback due to ffmpeg bug (version 5.1.4)