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.kha...@rit.edu> > Fecha: Jueves, 9 de Abril de 2009, 2:24 pm > Asunto: [AG-TECH] DVTS demo Fri 3:30 Eastern Time > A: "ag-t...@mcs.anl.gov" <ag-t...@mcs.anl.gov>, wg-multicast > <wg-multic...@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.kha...@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.kha...@rit.edu
