Loopback audio recording is broken

robmikh / CaptureVideoSample

A sample that records video using the Windows.Graphics.Capture and Windows.Media.Transcoding APIs.

MIT License

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Loopback audio recording is broken #3

Open Adam777Z opened 23 hours ago

Adam777Z commented 23 hours ago

The "wmt-audio" branch sample does not work correctly.

robmikh commented 23 hours ago

Which configurations have you tried? I just pushed a new commit to fix an issue when no audio source is selected.

This branch is still a work in progress and has some known issues:

Any recording using loopback audio does not work. There's a problem where the audio graph is flooded with quantum started events when the synthetic node is hooked up. If loopback is enabled the entire recording will not work properly.
AudioLoopbackInputNode has a race when shutting down the MF work queue. This code is generally not ready for consumption yet.

Having said that, recording using the microphone/audio input devices should work just fine.

Adam777Z commented 22 hours ago

I tried the defaults with "Record system audio".

robmikh commented 22 hours ago

Unfortunately, that doesn't work in the sample at this time. I'd take a look the official sample for loopback audio: https://github.com/microsoft/windows-classic-samples/tree/main/Samples/ApplicationLoopback

What you'll need to do is feed the audio samples along with the format to the audio graph API. I'm not an expert on the audio side, so I haven't had the time required to untangle my issue with the quantum started events. You may have better luck asking in one of the Microsoft Q&A communities or on one of the Microsoft sample repos.

Adam777Z commented 21 hours ago

I see. OK. Thanks for the help.

I am looking forward to your finished sample, whenever that may be.