[AG-TECH] Sony EVI-HD1 camera
John I Quebedeaux Jr
johnq at lsu.edu
Fri Mar 9 09:11:31 CST 2007
I think the demo would be good to see. I agree with your thought
there - until there is such thing as more bandwidth than we can fill
up there will be sites with constraints and the ability to choose
which versions of which streams (high vs low resolution/high vs low
bandwidth) having those choices is a good thing.
To address having multiple versions of streams and sites not having
the bandwidth, break them up into different groups (multicast
addresses). Say, you only want the h261 streams - that's one group.
DV... HD... HDV other groups. You only "get" a group if you "connect"
to it... etc. of course, then we start actually using groups! and
then we're back to the issue of multicasting. That's still a
problematic issue in my state, but i'm chipping away at it. With all
the video being tossed around these days, i have to think even
regular ISP's are thinking multicast thoughts... no?
I notice this camera has, like you say, many outputs available to it.
Looking forward to the Retreat - i've been encouraging attendance
from those projects and group in my state, the Access Grid is
becoming more "visible" and discussed as a way to enable and do
collaboration but lately the ability to do HD at the same time is
foremost in everyone's request. For me, besides the cost, it's the
ability to just "make it work" and the realization that I'm now using
projectors that are 4-5 years old and folks don't seem to understand
that resolution and screen "space" are two different things. The
ability to scale video to any size (and save/store those settings as
well - etc) would be ideal.... i've always pointed out how flexible
the AG ultimately is because it is a toolkit.
John I. Quebedeaux, Jr.; Louisiana State University
Computer Manager LBRN; 131 Life Sciences Bldg.
e-mail: johnq at lsu.edu; web: http://lbrn.lsu.edu
phone: 225-578-0062 / fax: 225-578-2597
On Mar 8, 2007, at 10:23 PM, Christoph Willing wrote:
> On 09/03/2007, at 3:49 AM, John I Quebedeaux Jr wrote:
>> Someone asked me about this camera for HD use on the AG: http://
>> Anyone have any experience with it? I'm wondering if it was used,
>> how to best "capture" it into a system for use on the AG...
>> interest in using HD is high here. I'm more concerned about
>> logistical issues with high resolution images on displays that
>> don't have that much "resolution" space - particularly if several
>> sites are involved.
> With regard to screen space logistics, we've developed a version of
> vic that does DV and HDV - full details and perhaps a demo at the
> forthcoming AG Retreat. One of the changes is the ability to resize
> the video window(s) to any size you like. Thus you could accomodate
> several streams at smaller than true HD size when display space
> becomes tight.
> BTW, I think that when DV, HDV, HD are all more common in the AG,
> best practice will be to always send those formats as duplicates of
> standard H261 streams so that other sites can choose to view their
> own preferred mix of H261 and higher resolution formats (somewhat
> avoiding the screen real estate problem you raised, not to mention
> bandwidth issues). The cameras we've been testing with have a
> number of simultaneous outputs available so its trivial to send
> both DV/HDV and H261 at the same time.
> Christoph Willing +61 7 3365 8350
> QCIF Access Grid Manager
> University of Queensland
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