[opendtv] Re: News: See the Big Picture? Don't Forget to Examine the Fine Print
- From: Craig Birkmaier <craig@xxxxxxxxx>
- To: opendtv@xxxxxxxxxxxxx
- Date: Tue, 4 May 2004 12:07:13 -0400
At 1:16 AM -0700 5/4/04, John Willkie wrote:
>Ah, but 1:2.21 is in the MPEG-2 and DVB specs. Is that going to be rendered
>only on 16x9 sets?
MPEG only uses formats as examples. Levels are only constrained by
three factors:
1. Maximum number of samples per line;
2. Maximum number of lines per frame;
3. Maximum number of samples per second.
The specs are aspect ratio agnostic; there is a flag to signal the
actual aspect ratio that is being used.
The DVB and ATSC specs place format constraints on the use of the
MPEG tools. This IMHO was a stupid mistake. At least DVB allows the
satellite guys the ability to use sub line lengths to cram more
channels into their transponders.
Regards
Craig
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