[opendtv] Re: 1080p@60 for MPEG-2
- From: "John Shutt" <shuttj@xxxxxxxxx>
- To: <opendtv@xxxxxxxxxxxxx>
- Date: Mon, 12 Nov 2007 11:53:19 -0500
----- Original Message -----
From: "Albert Manfredi" <bert22306@xxxxxxxxxxx>
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.
The tables appear to be labeled "upper bounds for sampling density", so 576
is an upper bound for number of lines, and 30 is an upper bound for number
of frames per second, but do not necessarily permit the 720x576x30 option.
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.
After reading the documents, it is my take that the proposed 1080p60 MPEG-2
"High Progressive" profile is intended for program acquition and editing,
not necessarily for ATSC emission.
The reference to software encoders would apply to NLE software such as Final
Cut Pro, not to ATSC stbs. This would allow 1080p60 masters to be created,
and downsampled to 1080i30, 1080p30, or 720p60 for emission.
John
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