Verify Video Publishing Options for Simulcast with H.264

[andreasteich]

Hi team,

I’m configuring the video publishing options for simulcast using the H.264 codec in the Swift SDK, and I wanted to verify if my setup is correct. I’m using LocalVideoTrack.createBufferTrack to stream CMSampleBuffer directly from AVFoundation with LiveKit. Here’s my current configuration for the room and publishing options:

private let roomOptions = RoomOptions(
        defaultVideoPublishOptions: VideoPublishOptions(
            encoding: VideoEncoding(
                maxBitrate: 3_500_000,
                maxFps: 30
            ),
            simulcast: true,
            simulcastLayers: [
                .presetH720_43,
                .presetH540_43,
                .presetH360_43
            ],
            preferredCodec: .h264
        ),
        adaptiveStream: true,
        dynacast: true
)
...
bufferTrack = LocalVideoTrack.createBufferTrack(
            name: "video0",
            source: .camera,
            options: .init(
                dimensions: .h720_43,
                fps: 30
     )
)

Could you please confirm whether this setup is correct for H.264 and simulcast, or suggest any necessary adjustments? The AVFounation captureSession resolution is set to to highest possible one with 1280x720.

Thanks in advance for your guidance!

Best regards