[opendtv] Re: New DVDs already sparking copy-protection confusion
- From: Gary Hughes <ghughesml@xxxxxxxxxxxxxxxxxx>
- To: opendtv@xxxxxxxxxxxxx
- Date: Fri, 03 Mar 2006 17:07:44 -0500
Kilroy,
thanks for the clarifications. As for the terminology, yeah, once
you cross application boundaries it becomes very inconsistent (assuming
it is consistent within an application area to start with). I tended
to call 24P in 30i encoding "inverse telecined" when talking to cable
guys.
>I suppose you might use 30i with 3:2 for inconsistent or off speed 30i
>masters of nominal 24P source where the encoder can't perform accurate
>inverse telecine. Lots of "shot on film, edited on video" TV used to be
>that way, and the original elements and edit decisions often aren't
>available (or economical) for a new transfer and edit. Warner used to
>have a visual comparator that would flash any frame cadence problems to
>an operator who would manually enter timecoded corrections in an EDL
>that would override the encoder on the next encoding pass until they had
>solid ten field 30i sequences that could be decoded to 24P.
A lot of NLEs did not observe or maintain the 3:2 cadence although that
has gotten better. Some will now let you edit in 24P and regenerate the
pulldown sequence on final render.
CableLabs specs require 30i and recommend 24P in 30i for film derived
content, but stop short of requiring it. A lot of the digital cable boxes
in use in North America do not implement fully compliant MPEG decoders.
Some ignore frame rate information and assume 30i, so straight 24P is
not an option.
>PS. How did Trip Hawkins slip in there and set progressive_sequence="3DO"?
Took a few moment for that to register :-)
gary
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