[FFmpeg-user] Syntax for merging + positioning two video streams in .mp4 container

[David Favor]

It appears .mp4 containers allow for positioning information
of multiple video streams.

My goal is to do -vcodec copy with two video streams, where
the 2nd stream is positioned to the right of the first one,
creating a "side by side" video.

And... skip the transcode step via -vcodec copy.

If this is possible, pass along the syntax.

Thanks.

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