Thanks for filing the issue!

As per Comment#0 the issue seems to happen with specific hardware, hence adding label "TE-Hardware-Dependency" and  component "Blink>WebRTC>Audio" for the respective team to investigate this further.

I tried https://webrtc.github.io/samples/src/content/devices/multi/ and output goes to the selected output device, as expected.


I checked appr.tc and it did not have a way to select the output device, so the default one was used.

I did not try https://eu.yourcircuit.com because it required sign up.

The attached video shows Skype for business, so it doesn't depict any issue with Chrome.

dimitrios.toumpanos@: Can you clarify what the specific bug is here?

The problem happens ONLY with the very specific hardware. I also tested with other devices and it is working OK

Also with the attached video we can see that everything is Ok in Windows sound settings.
The videο is for Windows sound settings, not from S4B 

If the exact hardware is essential, please add more details about names, driver version etc. Today, the report only states "one USB Audio Device".

I'm attaching the DxDiag from the affected system. 
Also see a comment from the affected user "This issue is independent of the USB loudspeaker, i.e. the issue is unchanged if there is no USB audio device respectively a loudspeaker connected to the stereo jack of the integrated soundcard. 

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Comment #8 is not inline with the original report which states:

"It happens with specific hardware. NOT with Just 2 output audio devices".
 
hence, I don't understand how #8 can be related to this issue. 

In comment #8 there is an attachment, which consist of the information for the specific hardware that the user is using. The problem it self is that when opening https://webrtc.github.io/samples/src/content/devices/multi/ and selecting the Jabra 9450 for output device the sound does not go Jabra.

So the problem is that trying to send output to the Jabra 9450 does not work when it is not the default device?

Can you provide the output you get from https://guidou.github.io/enumdemo.html?

Also, does the problem occur when you use https://guidou.github.io/setsinkid-demo.html?

Devices:1 - audioinput - default -
2 - audioinput - communications -
3 - audioinput - d1b0ee91b2fbee59bc5e6f84a2fb598a8ee66c55bf89f0fb9e01cd7a241bc91f -
4 - audiooutput - default -
5 - audiooutput - communications -
6 - audiooutput - 593f83fc9fcc3344c40a605a2500174ba2f5f01c5394b15f82828426cfa0c555 -
7 - audiooutput - eb3cd23fe596cb3091d5406d1f0bc886255f12c7d2752c483238676cdc851ede -
8 - audiooutput - 7eca91044a7fbce157602f149d6fd94be47d6fa654534f31b46d77fbb5b40d75 -
 
The problem is the same on https://guidou.github.io/setsinkid-demo.html.

If "communications" is selected, the audio output is on the Jabra Headset
If the Jabra Headset is selected, the audio output is on the systems default loudspeaker
 

Did you make sure to accept microphone permission when getUserMedia() asks for them?
At the moment, it's the only way to authorize output to nondefault devices (we have to fix the UI to make that clear).

The output you provide for enumdemo.html suggests that you didn't provide permission because device labels are not present. 
However, that might not be the case with setsinkid-demo. Can you confirm?

Answer from the user "Yes, I did. The page starts with no-permission error, then I authorized the microphone and repeated the test" 

Here the list with device names. Sorry!

Devices:1 - audioinput - default - Standardeinstellung - Mikrofon (Jabra PRO 9450) (0b0e:1021)
2 - audioinput - communications - Kommunikation - Mikrofon (Jabra PRO 9450) (0b0e:1021)
3 - audioinput - d1b0ee91b2fbee59bc5e6f84a2fb598a8ee66c55bf89f0fb9e01cd7a241bc91f - Mikrofon (Jabra PRO 9450) (0b0e:1021)
4 - audiooutput - default - Standardeinstellung - Lautsprecher (USB Audio Device) (0000:0201)
5 - audiooutput - communications - Kommunikation - Lautsprecher (Jabra PRO 9450) (0b0e:1021)
6 - audiooutput - 593f83fc9fcc3344c40a605a2500174ba2f5f01c5394b15f82828426cfa0c555 - Lautsprecher / Kopfhörer (Realtek High Definition Audio)
7 - audiooutput - eb3cd23fe596cb3091d5406d1f0bc886255f12c7d2752c483238676cdc851ede - Lautsprecher (USB Audio Device) (0000:0201)
8 - audiooutput - 7eca91044a7fbce157602f149d6fd94be47d6fa654534f31b46d77fbb5b40d75 - Lautsprecher (Jabra PRO 9450) (0b0e:1021)
 

So the system default is USB Audio Device.
In setsink-demo, if you select:
default -> output goes to USB Audio Device (correct)
communications -> output goes to Jabra PRO 9450 (correct)
Realtek High Definition Audio -> output goes to ?
USB Audio Device -> output goes to USB Audio Device (correct)
Jabra Pro 9450 -> output goes to USB Audio Device (incorrect)

This is accurate?

default -> output goes to USB Audio Device (correct)
communications -> output goes to Jabra PRO 9450 (correct)
Realtek High Definition Audio -> output goes to Realtek High Definition Audio (correct)
USB Audio Device -> output goes to USB Audio Device (correct)
Jabra Pro 9450 -> output goes to USB Audio Device (incorrect) 

Please see the last comment from the user:
"I just found a workaround for this problem. If I "Disable all enhancements" and restart Chrome, the audio output to Jabra works as expected.

The flag "Disable all enhancements" is not checked by default. "

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Is there any update for this bug?

Not yet. We have been unable to reproduce.

I think the chances are slim that we will be able to resolve this issue in Chrome given that there seems to be some driver conflict here. Also, there is a workaround in this case which I assume does not have any major negative impact.