[opendtv] Re: News: Intel introduces chips designed to improve Internet video quality
- From: Craig Birkmaier <craig@xxxxxxxxx>
- To: opendtv@xxxxxxxxxxxxx
- Date: Tue, 20 Nov 2007 10:43:42 -0500
At 8:47 AM -0500 11/20/07, John Shutt wrote:
Craig,
I couldn't disagree with you more.
Far from being ludicrous, adding 1080p60 to MPEG-2 makes sense to me.
MPEG-2, at higher bitrates and 4:2:2 color space, is a relatively
benign way to encode material for editing and other manipulation
before ultimate emission.
MPEG-4, especially if the full toolkit is used, not just the basic
level that is used for videoconferencing and those cheapie "H.264"
internet encoders, makes for a good one time encode for emission,
but is not suitable for multiple "passes" in the typical production
process
MPEG-2 1080p60 4:2:2 can compete effectively with HDCam's 3:1:1 or
DVCPRO 100's 4:1:1 color
I can see where an HDV 1080p60 4:2:0 mode could be feasible if the
bit rate were higher than 25 Mbps. Note that there is no need for a
4:2:2 color space for progressive images.
For example, Sony could offer a 1080@60P XDCAM HD that could sustain
better than 50 Mbps. Near as I can tell, there is nothing to stop
them from doing this even in ISO/MPEG does not add the requested
Level.
But the main thrust of the Japanese input documents to the MPEG
process dealt with encoding complexity, which is what the Intel
announcement is about.
Furthermore, H.264 offers many levels and profiles. Panasonic is
using the High-10 and High-422 profiles of H.264 for the AVC-intra
codecs that are augmenting/replacing the DVC-PRO HD codecs. These
intra-frame modes are SIGNIFICANTLY less complex to work with than
ANY inter-frame codec, be it MPEG-2 or MPEG-4.
IMHO, inter-frame compression should be reserved for emission.
Storage and processing power are cheap commodities; they are no
longer barriers to the use of frame based HD, as Avid has learned.
The industry will soon be deploying 32GB memory cards for HD
acquisition applications. EVEN Sony is finally getting the message
about "being digital."
Regards
Craig
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