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Last active December 8, 2021 09:01
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How to overlay/downmix two audio files using ffmpeg
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README.md

How to overlay/downmix two audio files using ffmpeg

Can I overlay/downmix two audio mp3 files into one mp3 output file using ffmpeg?

stereo + stereo → stereo

Use the amix https://ffmpeg.org/ffmpeg-filters.html#amix filter:

ffmpeg -i 01.mp3 -i 02.mp3 -filter_complex amix=inputs=2:duration=longest output3.mp3

stereo + stereo → stereo

Use the amix filter:

ffmpeg -i input0.mp3 -i input1.mp3 -filter_complex amix=inputs=2:duration=longest output.mp3

Or the amerge filter:

ffmpeg -i input0.mp3 -i input1.mp3 -filter_complex amerge=inputs=2 -ac 2 output.mp3

Use the amerge and pan filters:

ffmpeg -i input0.mp3 -i input1.mp3 -filter_complex "amerge=inputs=2,pan=stereo|c0<c0+c1|c1<c2+c3" output.mp3

mono + mono → stereo

Use the join filter:

ffmpeg -i input0.mp3 -i input1.mp3 -filter_complex join=inputs=2:channel_layout=stereo output.mp3

Or amerge:

ffmpeg -i input0.mp3 -i input1.mp3 -filter_complex amerge=inputs=2 output.mp3

mono + mono → mono

Use the amix filter:

ffmpeg -i input0.mp3 -i input1.mp3 -filter_complex amix=inputs=2:duration=longest output.mp3

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