[cisco-voip] Weird One: Discrete Right Audio Channel doesn't get sent out Jabber and WebEx

[Lelio Fulgenzi]

Definitely, the PC handles the stream, but if it sees stereo, it sends stereo. I was looking at the controls and I couldn’t find a “stereo-to-mono” switch.

It’s not a big deal, I can work around it. But I was surprised. I’m guessing these apps never expected people to bridge (semi) professional A/V equipment into the stream.

Thanks for the feedback.

P.S. For Brian: Yes – mixers have the pan option which you can set to the left (or middle). Also, there are a lot of XLR camcorder adapters that have a stereo-to-mono switch that handle this as well.

---
Lelio Fulgenzi, B.A. | Senior Analyst
Computing and Communications Services | University of Guelph
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From: Ryan Ratliff (rratliff) [mailto:rratliff at cisco.com]
Sent: Tuesday, January 2, 2018 10:30 AM
To: Brian Meade <bmeade90 at vt.edu>
Cc: Lelio Fulgenzi <lelio at uoguelph.ca>; cisco-voip list <cisco-voip at puck.nether.net>
Subject: Re: [cisco-voip] Weird One: Discrete Right Audio Channel doesn't get sent out Jabber and WebEx

Very likely depends on the codec as well. Even on high-end TP endpoints you don’t get stereo audio until you are in a conference call with a high-bw audio codec.

As for the encoding of the audio stream from PC input to application I wouldn’t be surprised if the PC hardware and OS had some role in how it ends up either.

-Ryan

On Dec 22, 2017, at 11:06 AM, Brian Meade <bmeade90 at vt.edu<mailto:bmeade90 at vt.edu>> wrote:

I don't believe WebEx or Jabber does stereo.  Probably just pulling the left stream in as mono.

You'll probably need an adapter or mixer to combine the 2 channels into a mono channel.

On Tue, Dec 19, 2017 at 7:32 PM, Lelio Fulgenzi <lelio at uoguelph.ca<mailto:lelio at uoguelph.ca>> wrote:

Ok. This is a weird one.

It seems as though any discrete right audio channel sent to either jabber or WebEx is not sent off (or not received) at the far end.

I've tested this a few ways, with different equipment, in different spots along the path, and it all points to software.

The weird thing is, the application audio test components show signal strength. It just doesn't make it to the other side.

Has anyone tested out discrete audio channels being sent to WebEx or Jabber?

The use case here is bridging purpose built audio/video equipment with PC based collaboration tools, e.g. Webex, Jabber, Teams, Zoom, etc.

For video (and sometimes audio), I'm using the Inogeni HD(HDMI)-to-USB3 converter.

For audio, I've tried a USB enabled Behringer mixer. That's worked, because I'm pretty sure the left and right channels are the same.

I also have an ART USB Dual Pre device which has both USB and analog out. In both cases, the right channel is not making it out to the far end, at least intelligibly. It's ever so faint and low and slowed down sometimes.

In the ART analog example above, I used a cable that fed the two outputs into the camera's mic input. Left channel fine, right channel nada.

Again, all along the path, signal strength is good and responsive.

What gives?

Lelio



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