Debugging Android WebRTC Audio 3A with AEC_DUMP and Audacity

Android WebRTC audio problems often start as a vague report: call quality is bad. The root cause may be echo, background noise, howling feedback, unstable loudness, near-end speech being over-suppressed, or far-end playback leaking back into the microphone. If the only test method is asking two people to make calls repeatedly and remember whether this build sounds better than the previous one, the…