Performing Arts Advisory

["Feghali, Jose" <>]

What I am saying is that ConfXP appears to do what DVTS does – i.e. send the firewire DV stream from the camera out via IP uncompressed by a codec on the computer.

 

I know that the DV codec has “theoretically” got some compression on it, but I got the same data rates for both DVTS and ConfXP. I have not dealt with any *really* uncompressed video format and do not intend to experiment with uncompressed HD or other “cutting edge” technologies anytime soon.

 

 

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From: Michael C. Wellings [mailto:]
Sent: Saturday, March 08, 2008 2:35 PM
To: Feghali, Jose
Cc: ;
Subject: RE: ConferenceXP update

 

That data rate is too low to be uncompressed SD video.  What is your input format? Must be compressed…

 

From: Feghali, Jose [mailto:]
Sent: Saturday, March 08, 2008 12:33 PM
To: Michael C. Wellings
Cc: ;
Subject: RE: ConferenceXP update

 

About the same as DVTS – almost 30 Mbps with video and audio (around 25 Mbps just video) using DV.

 

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From: Michael C. Wellings [mailto:]
Sent: Saturday, March 08, 2008 2:31 PM
To: Feghali, Jose
Cc: ;
Subject: RE: ConferenceXP update

 

What is your output data rate?

 

From: Feghali, Jose [mailto:]
Sent: Saturday, March 08, 2008 12:20 PM
To: Michael C. Wellings
Cc: ;
Subject: RE: ConferenceXP update

 

Under video settings, you can choose “uncompressed video” in the advanced box. It switches off the Windows Media encoding engine.

 

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From: Michael C. Wellings [mailto:]
Sent: Saturday, March 08, 2008 2:18 PM
To: Feghali, Jose
Cc: ;
Subject: RE: ConferenceXP update

 

I understand...fred mentioned you.  What hasn’t been there is support for multiple codecs, and for uncompressed HD video.  We are looking at the ConferenceXP front end for iHDTV.

 

ConferenceXP natively supports Windows Media encoding…what support for uncompressed video are your referring to?

 

From: Feghali, Jose [mailto:]
Sent: Saturday, March 08, 2008 12:13 PM
To: Michael C. Wellings
Cc: ;
Subject: RE: ConferenceXP update

 

Michael,

 

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.

 

José

 

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

 

Jose

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

 

mike

University of Washington

 

 

From: Feghali, Jose [mailto:]
Sent: Saturday, March 08, 2008 10:20 AM
To: Petr Holub;
Cc:
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?

 

Thanks,

 

José

 

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

 

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

 

Petr

 

================================================================

                            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

                                       e-mail:

 

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

 

Colleagues,

 

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

Artist-in-Residence

Coordinator of Internet Technologies

TCU School of Music