No audio in outgoing RTMP stream

[neilyoung]

I'm trying to capture the screen on an iOS 26 device. Video works. Even though I have the required info.plist entries for describing my microphone usage and even though I'm giving the required permissions to record audio and even though I see MIC and APP audio packet come in (and being forwarded): The outgoing RTMP stream (towards MediaMTX) does not have an audio track (proved with ffprobe and ffplay)

 try await stream.setAudioSettings(
                AudioCodecSettings(
                    bitRate: 64_000,
                    downmix: true,
                    channelMap: nil,
                    sampleRate: sampleRate,
                    format: .aac
                )
            )
            audioConfigured = true
            

[neilyoung]

Solved. I had to use AVAudioSession and the mixer