Can I overlay/downmix two audio mp3 files into one mp3 output file using ffmpeg?
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Can I overlay/downmix two audio mp3 files into one mp3 output file using ffmpeg?
stereo + stereo → stereo
Normal downmix
Use the amix filter:
Or the amerge filter:
Downmix each input into specific output channel
Use the amerge and pan filters:
mono + mono → stereo
Use the join filter:
Or amerge:
mono + mono → mono
Use the amix filter:
More info and examples
See FFmpeg Wiki: Audio Channels