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No audio when using GoCoder (with WebRTC)

When encoding with GoCoder my WebRTC stream has no audio. But RTMP playback does have audio. Audio works via WebRTC when encoding with OBS though. I have audio only transcoding setup to transcode AAC to Opus.

What could cause this?

JNI:AudioEncoderOpus.initialize[_defaultVHost_:webrtc/_definst_/demo:aac]: Sample rate is not supported [8KHz, 12KHz, 16KHz, 24KHz, 48KHz]: 44100

It seems GoCoder is using an audio sample rate of 44.1khz and I don’t see a way to change that in the app.