Pan and Scan on the Fly

I am watching two standard dvd's that allow selection
of wide screen or pan and scan on the fly- part of the
dvd design parameters. There is only one film
on the disk, but either format can be selected
by the player.

Almost no dvd's use this feature, yet I have two French, one Canadian
one South African and one British disks that use
this feature.

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So to pip, 24/96 pcm stereo we can add pan & scan
on the fly as dvd features that are virtually
unused