[AG-TECH] DVTS demo Fri 3:30 Eastern Time

[Gurcharan S. Khanna]

William,

I am dubious about being able to avoid echo just by mic/spkr placement, 
but i guess
i should try it myself first.

But my real question is how to use the multiplexed audio in the DV 
stream with
multiple DVTS sessions. If i have ten DVTS streams going to ten 
different multicast
addresses, i can start up ten instances of dvts to render them. but i'm 
unsure what happens
to the audio. how to aggregrate that into a common audio conversation?

one reason i am asking is because i notice that when using to do audio 
with DVTS, often
the video is behind the audio and the lack of lip sync is noticeable. i 
assume this is due
to how the operating processes audio and video separately. if so, what 
can be done? can
i introduce an artificial delay into the rat audio to bring it closer 
inline? how?

thanks for any thoughts,

-gurcharan

PS also, has anyone scripted starting up multiple DVTS instances 
pointing at hardwired
multicast addresses? (outside of using the AG). -gsk

William Alberto Romero Ramirez wrote:
> Gurcharan,
>
> I use a sound mixer and unidirectional-cardioid mics (Shure SM58, Sennheiser e901) in a specialiced computer for audio through the AG Node Service.
>
> You can send the camera's audio to the mixer in order to forward audio to an AG session. An unidirectional-cardioid mic rejects sounds from the rear part, so you can avoid the feedback (the cause of echo) if you set the mic behind the speakers.
>
> If you need any additional information, please feel free to contact me with any questions you may have.
>
>
> Regards,
> William A. Romero R.
>
>
> ___________________________________
> AG-MOX system manager
>
> http://ag-mox.uniandes.edu.co
> http://www.accessgrid.org/node/1074
>
> Universidad de los Andes
> Bogotá, COLOMBIA
>
>
>
>
> ----- Mensaje original -----
> De: "Gurcharan S. Khanna" <gurcharan.khanna at rit.edu>
> Fecha: Jueves, 9 de Abril de 2009, 2:24 pm
> Asunto: [AG-TECH] DVTS demo Fri 3:30 Eastern Time
> A: "ag-tech at mcs.anl.gov" <ag-tech at mcs.anl.gov>, wg-multicast <wg-multicast at internet2.edu>
>
>   
>> hi,
>>
>> i will be conducting a demo using DVTS inside of Access Grid 
>> tomorrow for a
>> Deaf/HoH faculty here plus other deaf/hoh users. the goal is 
>> partly to 
>> show several
>> high quality videos from a single location where each person can 
>> be 
>> clearly seen,
>> especially close-up, using sign language.
>>
>> the other part is showing connecting many sites with the same 
>> high 
>> quality videos.
>> so, we will be simulating 4 users in one room on campus viewing 
>> 5 users 
>> in another
>> room on campus using DVTS in AG.
>>
>> if anyone from a remote site would like to drop to demonstrate 
>> the 
>> remote viewing
>> quality using DVTS please do so!
>>
>> since we're using AG, we will be using RAT for audio.
>>
>> question: DVTS users: what do you usually do for audio in a 
>> multiway 
>> conference???
>> are there ways to split off the DV audio stream and feed it to 
>> another 
>> application???
>> how does echo cancelling work with DV cameras as sources????
>>
>> thanks for your feedback,
>>
>> -gurcharan
>>
>> PS this demo will held primarily in the RIT Venue of the ANL 
>> Venue 
>> Server. -gsk
>>
>> -- 
>> -------------------------
>> 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
>>
>> Founding Director, Interactive Collaboration Environments Laboratory
>> Center for Advancing the Study of Cyberinfrastructure
>> http://icelab.rit.edu
>> ---
>> Rochester Institute of Technology
>> IT Collaboratory Bldg. 17, Room 3119
>> 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

Founding Director, Interactive Collaboration Environments Laboratory
Center for Advancing the Study of Cyberinfrastructure
http://icelab.rit.edu
---
Rochester Institute of Technology
IT Collaboratory Bldg. 17, Room 3119
Rochester, New York 14623-5603
Phone: 585-475-7504  ~  Cell: 585-451-8370
Email: gurcharan.khanna at rit.edu