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3

Inverting the background should work, that's exactly how a balanced audio connection works to eliminate noise, but how exact a match is your isolated background track compared to the mixed track? It's only going to fully work if it is recorded at the exact same quality, volume, etc, and the timing is precisely the same. What was the recording source for each ...


2

First, if you just want information about a file, you should probably use "ffprobe", not "ffmpeg". Otherwise you'll get an answer, but you'll also have an error return status. As to your real question: By convention, ffmpeg reserves STDOUT for binary video and audio data only. Everything else, including all the possible kinds of ...


1

Upgrade to v 4.3 and limit the duration of the base layer, which is infinite, by default. Audio is fine. ffmpeg -i input1.mp4 -i input2.mp4 -i input3.mp4 -filter_complex nullsrc=size=960x304,trim=0:1 [base]; [0:v] crop=min(iw\,320):304:(iw-min(iw\,320))/2:0 [v0]; [1:v] crop=min(iw\,320):304:(iw-min(iw\,320))/2:0 [v1]; [2:v] crop=min(iw\,320):304:(iw-min(iw\,...


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