Mute specified sections of an audio file using ffmpeg

The following command will mute two sections: between 5-10s and 15-20s:

ffmpeg -i video.mp4 -af "volume=enable='between(t,5,10)':volume=0, volume=enable='between(t,15,20)':volume=0" ...

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Description:

-af is the audio filter. It works by specifying multiple volume filters that are enabled/disabled at the specified time. volume=enable='between(t,5,10)':volume=0 means use a volume filter that gets enabled between 5 and 10 seconds and sets the volume to 0.