![]() Here is what the previous solutions do instead, for the interested: OP wanted to remove silence from the start and the end. So far all the answers here are no solution for the question. Still, trimming + padding is the best I could come up with. Of course this is not the same as keeping some duration of the original silence (if present), because that would also allow result files that don't have any silence at the beginning if the input also doesn't have any silence at the beginning. X is the duration (in seconds) of the silence that we want to prepend.Ġ in this position means that no padding should be added at the end. This can be done with: sox in.wav out.wav silence 1 0.1 0.1% reverse silence 1 0.1 0.1% reverse pad X 0 The simple answer is: sox does not support this.īut we can try to work around this by trimming the silence and then add a fixed amount of silence at the beginning. Leaving a certain amount of silence at the beginning Why this approach is correct for trimming the end should become apparent below, where I analyze what the solutions of the other answers do. To trim silence at the end we use the same but reverse the audio first. Everything that is loud enough to be above the threshold will be interpreted as the start of non-silence if its duration is long enough (see X).ĭigitalcardboard states that the smallest value to be used should be 0.1% instead of 0.ġ simply specifies to remove silence only at the beginning. So some long rumbling sound at the beginning, that is not very loud might fall below the threshold and thus gets interpreted as silence and thus is not removed. ![]() Everything below it will be interpreted as silence, no matter how long or short it is. If for X we set 0.1 then the click will be interpreted by sox as the start of the non-silence part, meaning everything before the click will be removed but not the click itself.Īlso note that a trailing zero should be used if the duration is a whole number, so 1.0 should be used instead of 1 to avoid unexpected behavior. ![]() If we set 0.2for X then this loud but short click will be interpreted as silence and will be removed. For example there might be a loud clicking sound at the beginning of the audio that is 0.15 seconds long. X is the minimum duration (in seconds) of a sound in order to be interpreted as non-silence by sox. One solution would be (based on this Digital Cardboard blog post): sox in.wav out.wav silence 1 X Y reverse silence 1 X Y reverse
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