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I have 2 wave (.wav) samples of 1 second duration each. I need to mix them such that the second wave file starts at 0.5 seconds after the first one. I need to export the mixed wave format to a new wave file called output.wav. How can I achieve this using ffmpeg?
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Sox will allow to mix audio files. You can specify offsets using the -p pad option.
Check question 7 of the Sox FAQ for more info