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H.264 Audio

HDMI Audio Support

Audio support

The latest One-KVM versions support real-time HDMI audio over H.264/WebRTC. Audio quality is smooth enough for music playback. The system uses Linux ALSA drivers, while ustreamer and janus capture HDMI audio and transcode it to Opus.

Configuration

Docker users

Specify the audio device with -e AUDIONUM=0. See Docker environment variables.

Integrated image users

Edit /etc/kvmd/janus/janus.plugin.ustreamer.jcfg:

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video: {
    sink = "kvmd::ustreamer::h264"
}
audio: {
     device = "hw:0"
     tc358743 = "/dev/video0"
}

Configuration notes:

  • device: audio device address
  • tc358743: capture card video device address

Find Audio Devices

On Linux, check available devices with: 

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arecord -L   # Detailed list
arecord -l   # Short list

You can specify audio devices in one of the following ways:

  1. Card index: hw:0
  2. Card name: hw:CARD=MS2109
  3. Device path: hw:/dev/snd/controlC0

Use one method to enable HDMI audio.

Example

HDMI audio