Ffmpeg how to OVERLAY rather than split channels?

Question

linux

There are 2 mono wav files. You need to put them on top of each other. If done through Premiere Pro, both files are correctly converted to stereo files and superimposed on each other.

There are 257 of these files, so you need to automate.

Using the command

ffmpeg -i 1-L.wav -i 1-R.wav -filter_complex "[0:a][1:a]amerge=inputs=2[aout]" -map "[aout]" 1.wav

We get the desired result, BUT, one speaks in the right ear, the second in the left.

How to make both channels become stereo and just overdub?

Unfortunately, I encountered Linux for the first time, I could only assemble a thing from above, and insert hundreds of commands into one line through ;

Answer 1

Use amix