Error: Audio Engine Error(Audio engine returned error code: -3010)

[luciana-ezcurra]

Describe the bug

I’m unable to get the audio session or the video camera to work reliably when using
Room.localParticipant.setMicrophone(enabled:) and
Room.localParticipant.setCamera(enabled:) in LiveKit iOS SDK 2.9.0.

I need to publish media in H.264 to interoperate with Meta (Horizon / Workrooms).
Audio sometimes activates incorrectly, and video often fails to start or freezes at the first frame.

I have tried:

• letting LiveKit manage the AVAudioSession automatically
• providing my own AVAudioSession configuration (.playAndRecord, .voiceChat)
• publishing video using:
  • setCamera(enabled: true)
  • LocalVideoTrack.createCameraTrack() + publish(videoTrack:)

None of these combinations provide consistent camera or audio activation.

Expected behavior

• setCamera(enabled: true) should initialize camera, create the local video track, and publish it successfully.
• setMicrophone(enabled: true) should activate recording without interfering with AVAudioSession.
• Using RoomOptions with .h264 codec hint should reliably force H.264 encoding.

Actual behavior

• Camera sometimes does not start at all.
• When using my own AVAudioSession configuration, LiveKit throws audio-session activation errors.
• When removing my configuration and letting LiveKit manage the session, audio still fails intermittently with:

Livekit Version
2.9.0/2.10.0 (both same issue)

xcode Version
16.2

Apple M3 pro

func connectToRoom(url: String, token: String, isVideoCall: Bool) async {
guard room == nil else { return }

    self.isVideoCall = isVideoCall

    // Crear Room
    let options = RoomOptions(
        defaultCameraCaptureOptions: CameraCaptureOptions(
            position: .front,
            dimensions: .h720_169,
            fps: 30
        ), defaultVideoPublishOptions:
            VideoPublishOptions(
            encoding: VideoEncoding(
                maxBitrate: 300_000, // 300 kbps
                maxFps: 30
            ),
            preferredCodec: .h264
        )
    )

    let newRoom = Room(delegate: self, roomOptions: options)  //if I just put Room() the error changes -> Error: Audio Engine Error(Audio engine returned error code: -9001). I already checked the mic and camera permissions.

    self.room = newRoom

    do {
        try await newRoom.connect(url: url, token: token)
        try await newRoom.localParticipant.setMicrophone(enabled: true)
        
        if isVideoCall {
            try await newRoom.localParticipant.setCamera(enabled: true)
        }
    } catch {
        print("Error: \(error.localizedDescription)")
    }
}

func configureAudioSession() { //just tried with this one with no luck
let audioSession = AVAudioSession.sharedInstance()
do {
try audioSession.setCategory(
.playAndRecord,
mode: .voiceChat,
options: [.defaultToSpeaker, .allowBluetooth, .allowBluetoothA2DP, .mixWithOthers]
)
try audioSession.setActive(true)
let isSpeaker = audioSession.currentRoute.outputs.contains { $0.portType == .builtInSpeaker }
print("Audio session configurada: (audioSession.currentRoute) (isSpeaker)")
} catch {
print("Error configurando audio session: (error.localizedDescription)")
}
}

[hiroshihorie]

Hi, sounds odd the both camera & mic fails to publish. Can I see some logs ?

[luciana-ezcurra]

yes of course. I could finally connect the room and the audio works fine, but there is always a timeout in the video creation so the localvideo tranc and the remote track never appear... They get nil. My logs are:

Room.connect(url:token:connectOptions:roomOptions:) Connected to Room(sid: Optional(RM_4S3sNbXErVyr), name: 3897715d-04f8-47e0-93e9-d2725a4a331b, serverVersion: 1.9.3, serverRegion: Brazil)
LocalParticipant._publish(track:options:) [publish] LocalAudioTrack(sid: nil, name: microphone, source: microphone) options: nil...
[Retry] Attempt 1 of 3, delay: 0.2
[Retry] Attempt 1 of 3, delay: 0.2

CameraCapturer.startCapture() starting camera capturer device: <AVCaptureFigVideoDevice: 0x134700000 [Cámara frontal][com.apple.avfoundation.avcapturedevice.built-in_video:1]>, format: (format: 'vide'/'420v' 1280x 720, { 1- 30 fps}, photo dims:{1280x720,4032x2268}, fov:73.699, supports vis (max strength:Low), max zoom:128.88 (upscales @2.86), AF System:2, ISO:20.0-1920.0, SS:0.000039-1.000000, system exposure bias range:-2.0-2.0, supports HDR, supports high photo quality, supports Portrait Effect, supports Studio Lighting, supports Reactions, supports Smart Style, dimensions: Dimensions(1280x720)), fps: 30(0...30)
_LocalParticipant.publish(track:options:) [publish] failed LocalVideoTrack(sid: nil, name: camera, source: camera), error: Error Domain=io.livekit.swift-sdk Code=101 "Timed out" UserInfo={NSLocalizedDescription=Timed out}
Error: Timed out

func connectToRoom(url: String, token: String, isVideoCall: Bool) async {
guard room == nil else { return }

    self.isVideoCall = isVideoCall

    // Crear Room
    let options = RoomOptions(
        defaultCameraCaptureOptions: CameraCaptureOptions(
            position: .front,
            dimensions: .h720_169,
            fps: 30
        ), defaultVideoPublishOptions:
            VideoPublishOptions(
            encoding: VideoEncoding(
                maxBitrate: 300_000, // 300 kbps
                maxFps: 30
            ),
            preferredCodec: .h264
        )
    )

    let newRoom = Room(delegate: self, roomOptions: options)
    self.room = newRoom

    do {
        try await newRoom.connect(url: url, token: token)
        try await newRoom.localParticipant.setMicrophone(enabled: true)
        
        if isVideoCall {
            try await newRoom.localParticipant.setCamera(enabled: true)
        }
    } catch {
        print("Error: \(error.localizedDescription)")
    }
}

I need h264 particularly... Thank you very much and hope you have any clue that helps me

[pblazej]

@hiroshihorie I think it may be related (or even duplicated) #843

[luciana-ezcurra]

yes it seems to be the same issue, but I cannot make it work even in the 2.9.0 version. Is there any other stable version available to try with it? Thank you!

[pblazej]

@luciana-ezcurra what's the error for audio (logs)?

[luciana-ezcurra]

Room.connect(url:token:connectOptions:roomOptions:) Connecting to room...
Room.signalClient(_:didReceiveConnectResponse:) ServerInfo(edition: cloud, version: 1.9.3, protocol: 16, region: Brazil, nodeID: NM_OSAOPAULO1B_pgWCGcAH9pMG, debugInfo: )
Room.connect(url:token:connectOptions:roomOptions:) Connected to Room(sid: Optional(RM_65eCR8GtoXeS), name: 29c6a5d9-6812-4187-a4d4-82fdbf619d4e, serverVersion: 1.9.3, serverRegion: Brazil)
LocalParticipant._publish(track:options:) [publish] LocalAudioTrack(sid: nil, name: microphone, source: microphone) options: nil...
AURemoteIO.cpp:1.091 failed: 561.017.449 (enable 1, outf< 2 ch, 0 Hz, Float32, deinterleaved> inf< 2 ch, 0 Hz, Float32, deinterleaved>)
AURemoteIO.cpp:1.091 failed: 561.017.449 (enable 3, outf< 2 ch, 0 Hz, Float32, deinterleaved> inf< 2 ch, 0 Hz, Float32, deinterleaved>)
AudioSessionEngineObserver.configure(oldState:newState:) AudioSession failed to activate AudioSession with error: Error Domain=NSOSStatusErrorDomain Code=561017449 "Session activation failed" UserInfo={NSLocalizedDescription=Session activation failed}
Error: Audio Engine Error(Audio engine returned error code: -3010)

With this logic, the remote participant’s video is received correctly, but the local video track never resolves and is never rendered.

func connectToRoom(url: String, token: String, isVideoCall: Bool) async {
guard room == nil else { return }

    self.isVideoCall = isVideoCall
   
    let newRoom = Room(delegate: self)
    self.room = newRoom

    do {
        try await newRoom.connect(url: url, token: token)
        try await newRoom.localParticipant.setMicrophone(enabled: true)
        
        if isVideoCall {
            
            let cameraOptions = CameraCaptureOptions(
                position: .front,
                dimensions: .h360_169,
                fps: 15
            )

            let track = LocalVideoTrack.createCameraTrack(
                name: "cam",
                options: cameraOptions
            )
            
            try await room!.localParticipant.publish(videoTrack: track)
        }
    } catch {
        print("Error: \(error.localizedDescription)")
    }
}

[luciana-ezcurra]

HI! is it useful if I give you any other information? thank you!