[opendtv] Re: News: ATSC 2.0 and H.264 at HPA
- From: Craig Birkmaier <craig@xxxxxxxxx>
- To: opendtv@xxxxxxxxxxxxx
- Date: Tue, 3 Mar 2009 08:47:13 -0500
At 6:12 PM -0500 3/2/09, Tom Barry wrote:
It is very hard for me to believe that 1080i/25 or 30 takes less
than 1080p/24 for equivalent quality. (Assuming equal graininess)
- Tom
The original article, from which Bert derived his assumptions stated:
In terms of bandwidth needed for "critical material but not unduly
so" performance recommendations are: 10.5 Mbps for 720p/50; 12.1
Mbps for 440?1080i/25; and 12.8 Mbps for 1920?1080p/25.
The proper notation should have been:
10.5 Mbps for 720p/50
12.1 Mbps for 1440 x 1080i/25
12.8 Mbps for 1920 x 1080p/25.
These numbers seem quite reasonable. And the doubling thereof by Bert
for MPEG-2 is just about right.
What you are missing is the middle set of numbers is for 1440 x 1080
interlaced while the third set is for 1920 x 1080 progressive. If
you actually fill the 25P container with information it can carry
nearly twice as much information, not even taking into account the
the icrease in horizontal resolution.
Regards
Craig
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