I want record system audio,what should I do?

[dpengchen]

I use example demo,but record audio can't play.and what it records is not system audio.

[gordonklaus]

When you say "system audio" do you mean capturing the audio output by the system, as opposed to capturing microphone output? That's outside the scope of PortAudio; you'll have to configure your OS to route system audio in such a way that you can capture it.