[AG-TECH] HD on AG

[Piers O'Hanlon]

2008/12/15 Gurcharan S. Khanna <gskpop at cis.rit.edu>:
> All,
>
> I, too, am extremely interested in vic supporting HD formats, (including
> uncompressed!)
> One of the issues is the encoding latency problem. Not sure there's a nice
> low latency
> software encoding solution out there yet. Alternatively, we might look at
> cheap hardware
> encoders as the answer or HDMI cards to take the input from the camera. Can
> vic be made
> to take the output of, say, the BlackMagic Design HDMI card on a Mac?
>
> I am currently using AGDV under windows but would like to move to linux and
> use the
> HDV/DV linux vic for the DV part; i don't think it's encoding the HDV, just
> accepting
> it as input from the camera already encoded??? [chris?]
>
It is possible to just packetise the compressed data from a camera,
though as Chris points out it tends to have quite high latency. That
is why the ultragrid and derivatives used uncompressed HD as their
sources. VIC doesn't currently support mpeg2 nor does support
packetisation of an existing compressed mpeg2 stream.

Piers



> My ideal would be to encode the presenter's laptop output and deliver that
> as just another
> video stream along side the presenter's video and the audience video and
> have autoplace
> lay them out nicely in a framed window, a la Adobe Connect or similar
> products, so the
> presenter, the slides, and additional commentary could be nicely recorded
> for later video
> on demand playback.
>
> Just my opinion (and need),
>
> -gurcharan
>
> Piers O'Hanlon wrote:
>>
>> Hi Derek,
>>
>> In principle VIC should be able encode and decode HD video - using one
>> of the codecs that support such resolutions e.g. H.264 or h261as.
>>
>> One needs to modify some of the configuration code in VIC to allow
>> selection of larger resolutions (ie HD one needs something from 720p
>> (1024x720) upwards). And of course an HD source is necessary. We don't
>> currently have access to any HD kit so haven't had a chance to work on
>> it but anyone is welcome to try!
>>
>> Cheers,
>>
>> Piers
>>
>> 2008/10/22 Vine, Derek A <Derek.Vine at usd.edu>:
>>
>>>
>>> Hello all,
>>>
>>>
>>>
>>> I am doing some research to spec. up a new AG room, and the group with
>>> the
>>> money is interested in HD video.  I see that The University of Queensland
>>> has an HDV/DV VIC for Linux based systems already, but we would like to
>>> stay
>>> with Windows.
>>>
>>>
>>>
>>> I was just wondering what kind of time frame I can give them as to when
>>> HD
>>> will be supported in AG on Windows.  In particular, an HD VIC that will
>>> take
>>> its video from a capture card with an HD-SDI input, like the one attached
>>> in
>>> the PDF.
>>>
>>>
>>>
>>> Thank you in advance for your help.
>>>
>>>
>>>
>>> Derek Vine
>>>
>>> Communication Network Specialist
>>>
>>> The University of South Dakota
>>>
>>> 414 East Clark Street
>>>
>>> Vermillion, SD 57069
>>>
>>> (605) 677-8215
>>>
>>> dvine at usd.edu
>>>
>>>
>>>
>>>
>>>
>
>
> --
> -------------------------
> Gurcharan S. Khanna, Ph.D.
> Director of Research Computing
> Office of the Vice President for Research
> http://rc.rit.edu
>
> Assistant Research Professor, Ph.D. Program
> Golisano College of Computing and Information Sciences
> http://people.rit.edu/gskpop
>
> Director, Interactive Collaboration Environments Laboratory,
> Center for the Advancing the Study of Cyberinfrastructure
> http://icelab.rit.edu
> ---
> Rochester Institute of Technology
> 1 Lomb Memorial Drive
> Rochester, New York 14623-5603
> Phone: 585-475-7504  ~  Cell: 585-451-8370
> Email: gurcharan.khanna at rit.edu
>
>