All things related to multicast

["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" 
> <>
> Fecha: Jueves, 9 de Abril de 2009, 2:24 pm
> Asunto: [AG-TECH] DVTS demo Fri 3:30 Eastern Time
> A: 
> ""
>  
> <>,
>  wg-multicast 
> <>
>
>   
> > 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 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: