[opendtv] Re: Popular screen aspect ratios

  • From: Craig Birkmaier <craig@xxxxxxxxx>
  • To: opendtv@xxxxxxxxxxxxx
  • Date: Thu, 23 Dec 2010 07:43:05 -0500

At 5:10 PM -0600 12/22/10, Manfredi, Albert E wrote:
It appears to be a 2.37:1 ratio, actually. Even if 2560 X 1080, or 1700 X 720, are not on the radar as possible future DTV transmission formats, it would be nice if we could hope for an eventual anamorphic squeeze on transmission, for a 2.35:1 aspect ratio display? Otherwise, it's like I do now when I zoom into letterboxed + pillarboxed programs. Not as satisfying as it should be.
There is no problem with the delivery of full horizontal resolution with h.264, which has profiles to support 2560 x 1080. Can't do it with MPEG-2, but it is easy to scale 1920 x 810 (letterboxed 2.37:1) up to 2560 x 1080. This is probably what is happening today.
As with ANY digital compression algorithm, it is possible to use anamorphic squeezes to conserve emission bandwidth. In theory it should be possible to do the full 2560 x 1080 encoding with h.264 on Blu-Ray today. 

Regards
Craig


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