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

[Carl Eugen Hoyos]

David Favor <david <at> davidfavor.com> writes:

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

You may be wrong here;-)
(mov != mp4)

> 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.

This is not currently possible with FFmpeg.

Assuming you were the one uploading the Skype sample:
Did you already try to find out which mov atom 
allows QuickTime to understand it should place 
the video streams side-by-side?

Carl Eugen