I have used the following command
ffmpeg -i input.m4a -af silenceremove=0:0:0:-1:0.5:-20dB output.m4a
on a file. When I use another tool (Audacity) to truncate periods over
0.5 seconds of under -20dB volume it removes upwards of an hour from
the input file. When I run this command ffmpeg doesn't remove a single
second. I have tried numerous variations of the command and numerous
input files, and am simply unable to replicate the effect Audacity is
producing.
The input files have a period of silence at the beginning that is
predictable, intermittent periods of silence throughout the file of
unknown quantity and length, and a period of silence at the end that
is predictable.
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