"No capture devices are available" in mediaCapture.InitializeAsync

Question

Here's the code:

MediaCapture mediaCapture;
mediaCapture = new MediaCapture();
await mediaCapture.InitializeAsync(new MediaCaptureInitializationSettings { MediaCategory = MediaCategory.Speech });

the last line throws an exception:

"No capture devices are available"

That is despite a microphone being connected. The microphone works with the built in Windows 10 Voice recorder app so I know it's fine. The app has permission to use the microphone, and it is on in the app's settings.

So why do I get the error / How do I overcome it?

Answer 1

Have you specify Micorphone capabilities in Package.appxmainfest? If does, it should work, but throw another exception.

There are no more endpoints available from the endpoint mapper.

Cause you need to set StreamingCaptureMode.

I have corrected your code, see below.

MediaCapture mediaCapture = new MediaCapture();
await mediaCapture.InitializeAsync(new MediaCaptureInitializationSettings 
{
    MediaCategory = MediaCategory.Speech,
    StreamingCaptureMode = StreamingCaptureMode.Audio
});

For more info about speech, you can refer to this doc.