[Sephr]

That's nothing. One of the biggest injustices with Google Cast is that capturing system audio on Android is a whitelisted system-only permission and only Google Cast (and a couple system apps) are allowed access to this. Somehow screen video capture isn't a system-only permission.

Nobody other than Google (or your OEM) is allowed to build complete screen casting apps on Android. All third party solutions require you to output your audio through your speaker and capture it with your microphone, which is much worse quality, single-channel, and makes sound (I want to hear my device audio through the speakers of the device I'm casting it to).

It makes no sense, especially when any device on your network can emulate being a Miracast receiver and get access to the same audio data that you aren't allowed to access on your own device. In fact, Windows 10 insider preview currently includes a Miracast emulator just for this purpose of Android screen sharing.