[AG-TECH] HDAG
Gavin W. Burris aka 86
ga5in at psu.edu
Fri Aug 30 09:38:35 CDT 2002
There is an open source, multi-platform project that deals with high
resolution video and multicast: www.videolan.org
These tools can take high-resolution video from an MPEG2 capture
card, DVD, or MPEG files and stream out on multicast.
Osland, CD \(Chris\) wrote (on Fri, 30 Aug 2002 at 13:05):
> 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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--
<<--=[ Gavin W. Burris aka 86 <ga5in at psu.edu> ]=-->>
<<--=[ Penn State Visualization Group Systems Programmer ]=-->>
<<--=[ http://viz.aset.psu.edu/ga5in ]=-->>
<<--=[ EOF ]=-->>
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