[AG-TECH] HDAG
Osland, CD (Chris)
C.D.Osland at rl.ac.uk
Fri Aug 30 07:05:58 CDT 2002
I've just had a long chat, by phone, with Sascha. His interest
is, as he says, mainly in getting high quality stored media such
as DVD quality video over the Internet, but is also interested
in aspects of this that relate to AG. He is hoping to get an AG
built at his institute.
It appears to me that a number of requirements are covered by the
term 'High Definition Access Grid':
for camera sources or external analogue sources ...
better than CIF image compression (e.g. full PAL or NTSC
rather than sampled down to half in X and half in Y)
higher frame rates at CIF and better resolution (e.g. up
to what would be needed to lip read)
capture of resolutions higher than PAL/NTSC (e.g. using
the card mentioned at the AG Retreat - I'll look at the
CD-ROM of the proceedings to get more details)
for internal digital sources (e.g. computer application) ...
higher bandwidth allowing things like VNC to work
closer to real-time while still loss-less
better ability to control trade-off between spatial
resolution (compression) and frame rate in things like VNC
for external digital sources (e.g. DVD)
mechanisms that make it worthwhile having such sources,
i.e. that provide better results at remote sites than
the same sources captured and relayed as analogue signals
multi-channel sound
Some of these may already be available in VIC, RAT and VNC but do not
appear to be used by the AG community. In at least one case while
we were testing with Belfast, they switched VIC to a higher
(spatial) resolution on the fly and every connected site's Display
system crashed instantly!
If there are others who would (a) like to experiment with the
existing tools to see what already works, (b) continue airing
this topic in ag-tech, and (c) maybe occasionally meet over the
AG to discuss ways forward, that would be good.
Cheers
Chris Osland
____________________________________________________________________
Chris Osland Office tel: +44 (0) 1235 446565
Digital Media and Access Grid Medialab tel: +44 (0) 1235 446459
BIT Department Access Grid room tel: +44 (0) 1235 445666
e-mail: C.D.Osland at rl.ac.uk Fax: +44 (0) 1235 445597
CLRC Rutherford Appleton Laboratory (Bldg. R18)
Chilton, DIDCOT, Oxon OX11 0QX, UK
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-----Original Message-----
From: Sascha Ignjatovic [mailto:sascha at chello.at]
Sent: 12 August 2002 11:45
To: ag-tech at mcs.anl.gov
Subject: [AG-TECH] HDAG
hi my name is sascha from vienna austria..
i am very interested in access grid and starting in september
we will try to build one at the technical university of vienna
thank you all for your work in developing and aplying this
cool and future technologie...
i am not a technical person as i am more into aplications..
so hier i have a question...
john shalf from lbl told me that there is already the
"next big thing" the
HIGH DEFINITION ACCESS GRID
i wrote to rick stevens got not a replay so far..
becouse i am little inpatient :-) now i am humbly asking the list..
if there is any information already available on the HDAG
i would apreciate it very much...!!
thanks
sascha
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