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Audacity has a Truncate Silence effect (Effect > Truncate Silence...) which should be able to do what you want: There are many other alternatives in other applications - but these are for Windows or OSX. I'll list them here for other users with same question but different host/OS needs: Pro Tools - Strip Silence Reaper - Dynamic Split Cubase - Cut head ...

I've never used ffmpeg like this, but I had a quick squint at the filter docs, specifically the silenceremover and straight away I noticed the detection system defaults to RMS. Maybe this is where the confusion about the dB value has come from. Try switching it to peak. It should work more the way you want, but I'm not sure if that would be better or not for ...

Use a noise gate with a fast attack and medium release. So long as the threshhold is above the floor noise/background noise, it will cut off any sound during the silent parts of the track. There are other ways such as noted below, in Cubase its called a "DeNoiser". However, it comes at a slight sacrifice of certain frequencies within the audio, so I would ...