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I'm trying to add background audio to a primary wav file. 

sox -m primary.wav background.wav output.wav

I have about 5s of background chatter in background.wav and I'd like the output to always be at the length of primary. How can I make sox loop and trim background.wav to the length of primary for mixing in shell?

codekitty
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1 Answers1

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ffmpeg does it very well. For example:

ffmpeg -i input1.mp3 -i input2.mp3 -filter_complex amerge -ac 2 -c:a libmp3lame -q:a 4 output.mp3

See the FFmpeg manual for Manipulating audio channels

cmak.fr
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    in order to add background wav to my input wav (mono) I used: ffmpeg -i input.wav -i background.wav -filter_complex amerge -ac 1 output.wav – codekitty Jun 19 '18 at 08:27