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Subject: Performing Arts Advisory

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RE: ConferenceXP update

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  • From: "Feghali, Jose" <>
  • To: "Michael C. Wellings" <>
  • Cc: <>, <>
  • Subject: RE: ConferenceXP update
  • Date: Sat, 8 Mar 2008 14:13:01 -0600



I have been in touch with Fred Videon at your CS department and Paul Oka at MSoft on this over the last few weeks. According to Fred, the code changes I made which allow for uncompressed audio without glitches and for synching audio and video will be incorporated into CXP version 5.0.


Uncompressed video has always worked, and HDV also worked yesterday. In order to get DV and HDV to work properly with ConfXP, one needs to “downgrade” to Windows Media 10, as there appears to be a problem under Windows Media 11 which doesn’t allow for compressed video in CXP.




From: Michael C. Wellings [mailto:]
Sent: Saturday, March 08, 2008 1:26 PM
To: Feghali, Jose; Petr Holub;
Subject: RE: ConferenceXP update



Along with our CS Department we got the grant from Microsoft Research to continue development work on ConferenceXP.  In a mtg the other day we discussed this prospect as well as plugging live HDV into ConferenceXP, and opening it up to other CoDecs and – Uncompressed video.  If there is interest in the community to do this is may help with the decision process



University of Washington



From: Feghali, Jose [mailto:]
Sent: Saturday, March 08, 2008 10:20 AM
To: Petr Holub;
Subject: RE: ConferenceXP update


I tried RAT a while back and couldn’t get it to work right uncompressed.


Do you know what is the max resolution that VIC supports? Is there a FAQ that you know of that explains how to setup RAT and VIC for IP-to-IP conferencing?






From: Petr Holub [mailto:]
Sent: Saturday, March 08, 2008 12:14 PM
To: Feghali, Jose;
Subject: RE: ConferenceXP update


RAT from MBone Tools (or AccessGrid) can do also uncompressed audio at this level.





                            Petr Holub

CESNET z.s.p.o.                       Supercomputing Center Brno

Zikova 4                             Institute of Compt. Science

162 00 Praha 6, CZ                            Masaryk University

Czech Republic                     Botanicka 68a, 60200 Brno, CZ

e-mail:                phone: +420-549493944

                                             fax: +420-541212747



From: Feghali, Jose [mailto:]
Sent: Saturday, March 08, 2008 6:28 PM
Subject: ConferenceXP update




We have know successfully tested ConferenceXP with uncompressed stereo audio (16/44.1 and 16/48) using both compressed and uncompressed video. The latency with all uncompressed appears to be lower than DVTS, but there is some question as to the video quality. One of the testing sites reported the video being slightly less sharp with ConfXP using an HDV camera. It appears that an optimum bandwidth with compressed video/uncompressed audio is in the order of around 2.5 to 3.5 Mbps, but we have gotten good results down to around 2 Mbps.


If there are any other performing arts institutions or others that would like to test ConfXP in full uncompressed audio with or without compressed video, please get in touch with me off-list at (j DOT Feghali AT tcu DOT edu).


If anyone here knows of any other conferencing solution currently available that allows for full, 44.1/48 KHz uncompressed audio to be paired with compressed video I would appreciate the input.


José Feghali


Coordinator of Internet Technologies

TCU School of Music

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