ffmpeg remove all silent parts from audio file

Question

I would like to cut the silent parts (where my prof writes on the blackboard but does not talk) off from my lecture notes. I tried ffmpeg -i input.mp3 -af silenceremove=1:0:-50dB output.mp3 from this post, but it only deletes silence from the beginning of my file.

Can I delete the silence everywhere with one command? I only want the speech without all the writing on the blackboard. Thank you!

score 6 · Answer 1 · answered Dec 18 '20 at 22:11

6

Is the threshold -50dB low enough? Also I guess "silenceremove=1" means remove only one period. Examples with more parameters use -1 to indicate an unlimited amount of periods:

http://underpop.online.fr/f/ffmpeg/help/silenceremove.htm.gz Or: https://ffmpeg.org/ffmpeg-filters.html#toc-silenceremove

Trim all silence encountered from beginning to end where there is more than 1 second of silence in audio:

silenceremove=stop_periods=-1:stop_duration=1:stop_threshold=-90dB

(90 dB maybe is too low, depends on the noise level)

answered Dec 18 '20 at 22:11

Twenkid

825
7
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Thank you a lot. It worked very well! I did end up using `ffmpeg -i input.m4a -af silenceremove=stop_periods=-1:stop_duration=1:stop_threshold=-40dB output.mp3`, like you suggested. I just changed the threshold a bit – user195392 Dec 19 '20 at 14:42
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You're welcome! BTW, you could mark the answer if it solved your problem. – Twenkid Dec 19 '20 at 22:09
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I would accept your answer :) – Frankie Drake Feb 23 '22 at 13:09

ffmpeg remove all silent parts from audio file

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