[FFmpeg-user] overlay audio channels

[Kosta Vlotis]

i have a question i know is a bit strange.

i was wondering if it's possible to overlay 2 audio channels in the
same video with ffmpeg.

Example: videoX has left audio channel: X and right audio channel: Y

i would like to make it so that it looks like: left audio channel=xy
and right audio channel=xy

i know that setting "-ac 1" pretty much accomplishes this BUT the
metadata obviously shows mono. i'd like to accomplish the same but
with stereo instead of mono.

any ideas?