[AG-TECH] HD on AG

Piers O'Hanlon p.ohanlon at cs.ucl.ac.uk
Sun Dec 14 21:24:34 CST 2008


2008/12/15 Gurcharan S. Khanna <gskpop at cis.rit.edu>:
> Piers O'Hanlon wrote:
>>
>> 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.
>>
>
> wait, i thought chris' vic supported HDV, which i assume is mp4???
>
AFAIK most cameras support HDV - which is closely related to MPEG-2:
http://en.wikipedia.org/wiki/HDV#HDV_720p

> also, how hard/easy would it be for vic to support packetizing uncompressed
> HD?
>
Not that hard - one needs to read the [RTP and codec] specs and code
it up - or borrow someone else's....

Piers.

> :-)
>
> -gurcharan
>>
>> 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
>>>
>>>
>>>
>
>
> --
> -------------------------
> 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
>
>



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