[opendtv] Re: 1080p@60 for MPEG-2
- From: Craig Birkmaier <craig@xxxxxxxxx>
- To: opendtv@xxxxxxxxxxxxx
- Date: Sun, 11 Nov 2007 10:27:28 -0500
At 5:17 PM -0500 11/10/07, Albert Manfredi wrote:
First of all, I think it's a great idea to add 1080 at 60p in MPEG-2
compression, because it makes it far more likely to get adopted in
countries that already have HDTV using MPEG-2 compression. So, good
for the ITU.
Why would the creation of a new MPEG-2 level help anyone?
There are no existing decoders that could use this new level. And
there is no good reason NOT to use H.264 (which does support
1080@50/60P) if you are going to need to deploy new decoders for a
service. Likewise, there would be no benefit to adding 1080@60P
MPEG-2 support to the ATSC standard for the SAME reason.
Secondly, I don't really understand Tables 1 and 8-11. What they
call "high level," as opposed to "high progressive," looks an awful
lot like 1080 at 60i to me, including in the number of samples/sec
(62.6 Msamles/sec). And yet, they call this 60 frames/sec, even in a
table in which "main level" is shown to include such options as 720
X 576 at 30 frames/sec.
Something isn't consistent.
Would be nice to see how MPEG-2 compression does with a 1080 at 60p
stream crammed into 19.39 Mb/s. I've heard a lot of people saying
that progressive compresses better than interlace, so the question
will be whether it compresses "better enough" to fit.
This is backward looking legacy technology trying to sole a problem
that has already been solved with better technology.
Regards
Craig
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