[AG-TECH] HD on AG

Christoph Willing c.willing at uq.edu.au
Sun Dec 14 19:36:35 CST 2008


On 15/12/2008, at 11:00 AM, Gurcharan S. Khanna wrote:

> 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?]


Yes, the HDV from firewire port of various cameras has a latency of  
between half to 1 second due to internal camera mpeg2 compression of  
the signal.

The Blackmagic Intensity card would be great if they made a Linux  
driver, however overtures to Blackmagic from a number of different  
parties have all been unsuccessful. Its a pretty specialised skill to  
be able to create a driver without the manufacturer's help.


chris


> 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
>

Christoph Willing                       +61 7 3365 8316
QCIF Access Grid Manager
University of Queensland




More information about the ag-tech mailing list