[opendtv] Re: News: CEA FORECASTS CONSUMER ELECTRONICS REVENUE
- From: Tom Barry <trbarry@xxxxxxxxxxx>
- To: opendtv@xxxxxxxxxxxxx
- Date: Sun, 14 Jan 2007 09:46:51 -0500
Craig -
Thanks. I can read it now.
Apart from the interlace issue, I've posted a few times here that I'd
like to see codecs with continually varying resolution, based upon
moment to moment bit rate constraints. The reason being there does
appear to be a sweet spot for at least block based codecs where you get
a better picture by lowering the resolution rather than by quantizing
more.
So in your suggested case it would automatically end up encoding at 576p
anyway in needed cases.
Possibly some wavelet codecs can now do this more automatically. Dunno.
Of course a further consideration is whether there is any useful
information above 576p (or 720p) that has made it through the
acquisition process (camera, film copy, telecine, previous encoding,
etc.) anyway.
If not then downsampling and sending 576p is a no-brainer, an obvious
choice except for resolution bragging rights for PR purposes.
- Tom
Craig Birkmaier wrote (earlier post):
If one were to take any of the HD formats and resample to 576P, then
encode using MPEG-2 or H.264, the difference between the downsampled
version and an HD encoding would be nearly impossible to detect on most
of the HD capable displays shipped to date. In fact, the downsampled
version might look better at 10 Mbps than the HD version due to
quantization of the HD source.
Craig Birkmaier wrote:
At 12:49 PM -0500 1/13/07, Tom Barry wrote:
Craig -
What format is that image? I don't know how to open it.
Whoops. I thought it was a JPEG, but it turns out it is a Macintosh PICT
file, which is lossless (Run Length Encoded).
I am attaching a JPEG version.
Craig
--
Tom Barry trbarry@xxxxxxxxxxx
Find my resume and video filters at www.trbarry.com
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