How to capture audio by PyAV in Linux?

Question

I want to capture audio to stream in with aiortc, installed on ubuntu 22.04, using python.

I tried av.open(format='alsa', file='default') and av.open(format='pulse', file='default'), and got `ValueError: no container format 'alsa'.

So, what can I do to solve it? Thank you

Answer 1

Try this:

    def get_available_cameras(self):

        devices = FilterGraph().get_input_devices()

        available_cameras = {}

        for device_index, device_name in enumerate(devices):
            available_cameras[device_index] = device_name

        return available_cameras

    def create_local_tracks(self):
        global relay, webcam
        options = {"framerate": "30", "video_size": "640x480"}
        camera_name = "video="+self.get_available_cameras()[0]
        webcam = MediaPlayer(camera_name, format='dshow', options=options)
        relay = MediaRelay()
        return relay.subscribe(webcam.video)