MP4 video embedding
mov file allow embedding of few video files in fancy way (presentation in one rectangle, human face in other, static background/border in third).
Here sample of such video: https://cast.switch.ch/vod/clips/26uo9i576i/quicktime.mov
VLC plays that video in three separate windows, without embedding.
Was confirmed on linux and windows.
Edited by Rémi Denis-Courmont