[opendtv] Re: JPEG2000?
- From: Steve Wilson <stevenjwilson@xxxxxxxxxxx>
- To: opendtv@xxxxxxxxxxxxx
- Date: Thu, 13 Jul 2006 10:05:49 -0400
Cliff Benham wrote:
> [from a friend who is supposed to know whereof he speaks...]
>
> "Well, Microsoft, the H.264 consortium, et.al. have done it.
>
> They couldn't find a way to play nice in their little sandbox. None of
> them will make anything from their digital video formats.
>
> The Library of Congress, and Digital Cinema have gone with JPEG2000.
>
Lib of Congress selected J2K years ago and Digital Cinema maybe a year
or 2 ago.
> The compression rate for JPEG2000 is incredible. An over 2 hour
> theatrical release takes only 250 G. All I frames, so no time fractured
> macro blocking.
>
Yes, but 125GB/hr equates to about 280Mbps whereas an HD movie in
MPEG2/H264 is the 50Mbps and less category. At the same bit rate, is
one better than the other? I don't know. But, J2K is a completely
different approach to compression with much different characteristics -
those different characteristics may have been what really drove these
decisions.
> So on the 4 RU storage system that Sun just announced (48 TB) you could
> put close to 200 movies with resolution several times that of HDTV."
>
>
>
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