What Is A TrackStartError?

I am running audio only sessions using the constraints: var constraints = { audio: { mandatory: { echoCancellation: false }, optional: [{ sourceId

Solution 1:

TrackStartError is a non-spec Chrome-specific version of NotReadableError:

Although the user granted permission to use the matching devices, a hardware error occurred at the operating system, browser, or Web page level which prevented access to the device.

Seems fitting, given that your constraints are non-spec and Chrome-specific as well. Instead, try:

  var constraints = {
    audio: {
      echoCancellation: { exact: false },
      deviceId: audioSource
    },
  };

I highly recommend the official adapter.js polyfill to deal with such browser differences.

Some systems (like Windows) give exclusive access to hardware devices, which can cause this error if other applications are currently using a mic or camera. It can also be a bug or driver issue.