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SOX and fade in and fade out

I'm trying to create a fade in and fade out for several wave files that I won't know the total time duration in seconds of. I read the manual but the example I see all looks like I need to know the full length of the file. Can someone post an example of fading in 5 seconds and fading out 7 seconds without knowing the full length of the wav file?

Solution

  • You can use a simple bash script, as this:

    #! /bin/bash

WAV_IN=$1
WAV_OUT=$2

FADE_IN_L="0:5"
FADE_OUT_L="0:7"

LENGTH=`soxi -d $WAV_IN`

sox $WAV_IN $WAV_OUT fade $FADE_IN_L $LENGTH $FADE_OUT_L

    soxi -d returns the length of the wav file. See sox documentation for more on soxi.

    You can run this bash script as follows:

    ./fadeWav test.wav faded.wav