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I'm tring to use the Audio plugin as in subject.
How Can I set a default Input/output device in order to regiter or playback tracks ?
Thanks,
Eudosia.

What do you want exactly?

With PortAudio classes, you can specify on Opening of a stream what device you want.

Greetings
Christian

In your audio port sample there is a way only to read the system device (input/output)
In your sample If I start a streamrecorder it uses the default input device (0- default)
I would to know how to set my input/output device, and in general, how to set the same paramenters I can set with
the other class qtgrabberMBS (channels, compression, rate, mono/stereo, ecc).
THanks,
Eudosia

You can use PortAudioStreamRecorderMBS class and use OpenStream method to open the device you need with the channel count and bit rate you need.

PortAudioStreamRecorderMBS records raw frames. You can write them in a wav file and have QTMovieExporterMBS class compress it to mp4 or whatever you prefer.

Greetings
Christian