To edit video and audio files in ffmpeg, below are some commands. Open a terminal window and try them out. These are very useful when creating training videos.
Extract mp3 audio from mp4 file$ ffmpeg -i video.mp4 -vn -ab 256k -ar 48000 -y audio.mp3 <enter>
Split from 7 seconds to end$ ffmpeg -i audio.mp3 -ss 7 -acodec copy output.mp3 <enter>
Split from 7 seconds point to 3:19 point$ ffmpeg -i output.mp3 -ss 00:00:07 -to 00:03:19 -acodec copy clipped.mp3 <enter>
Boost Sound by 1.5 times of output.mp3 file.$ ffmpeg -i clipped.mp3 -filter:a "volume=1.5" boosted.mp3 <enter>
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