Unanticipated Host Error - WASAPI loopback

Audacity 3 Help Forum
1

Really struggling with a WASAPI loopback recording of the computer audio.
Recording via microphone is fine via MME/Directsound. No issues.
As soon as I choose WASAPI to get the computer audio, then it returns the error.

Windows 10, Realtek Audio (Asus motherboard), Audacity 3.3.3
I was able to use loopback years ago, and then I am pretty sure I had it working at one point with this new version, so completely confused as to why it is now not working.

Having read a number of other threads I have:

  • checked my soundcard speaker output is on stereo not 5.1
  • rescanned audio devices
  • Check transport overdub option on/off (no impact)
  • Software playthrough on/off (no impact) - updated.

Audio Settings
WASAPI
Playback - Speakers (or thru monitor)
Recording - Speakers loopback (or thru monitor loopback)
Sample Rate 44100
Sample format: 32-bit
Buffer length: 100
Latency: -130

Again, no problem recording microphone audio on MME/Directsound. Only issue is when trying to use the loopback.

If even try and PLAY something, it also gives the error on WASAPI.

There’s a comment about giving audicity permissions, but that thread is private (or no longer exists).

2

You seem to be pretty thorough.

You might also check that software playthrough is not checked.

3

Was unchecked. Hadn’t found a post on that one. :slight_smile:
(added to opening post)

4

Rebooting has been know to correct this issue. Also, you may have the option of Stereo Mix. Open the Windows Sound Control Panel, Record Tab, right-click in blank space in the panel and select Show Disabled and Disconnected Devices.

5

Great thinking. Sadly … ahead of you.
Already did the restart. It made me to a test to prove it’s just the loopback tho.

I had the test to use my microphone on Directsound, using the speakers.
On switching to WASAPI, I left it on the microphone and it recorded.
Switched to loopback for recording, and it gave the error again.

As for Stereo Mix, it wasn’t disabled. I set it to allow recording but that also didn’t work.
What should that be set to, in your opinion?

6

Error:

{
“timestamp”: 1689023863,
“event_id”: “9c82d15893cb8c41ba36ba82dd9c1e57”,
“platform”: “native”,
“release”: “audacity@3.3.3”,
“contexts”: {
“os”: {
“type”: “os”,
“name”: “Windows”,
“version”: “10.0.19045”
}
},
“exception”: {
“values”: [
{
“type”: “Error”,
“value”: “Error opening recording device.\nError code: 0 Success.”,
“mechanism”: {
“type”: “runtime_error”,
“handled”: false
}
}
]
}
}

7

Ooooooh, actually tested using the stereo mix. Doh.
That worked.
Still a problem with loopback.

8

Glad to hear you got your recording working. :grinning: If you ever do get the loopback to work please share your trick here so others can try it.

9

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