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v3 audio

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Maxim Devaev 2022-06-08 04:10:11 +03:00
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# PiKVM V3 Audio
This feature allows you to receive audio over an HDMI cable and transmit it to the browser in WebRTC mode.
!!! warning
* This is only supported by PiKVM V3 devices right now.
* Please not the feature is experimental. Nothing will explode for you, but something may not work. Please report about problems [here](https://discord.gg/bpmXfz5) (preferred) or [here](https://github.com/pikvm/pikvm/issues/97).
## Preparing
1. Make sure that you have not removed the [jumpers related to audio (4)](v3.md#atx-connection) on the V3 board and have not deleted or commented out the `dtoverlay=tc358743-audio` line in `/boot/config.txt`. Return everything as it was, if you changed it.
2. Update the OS:
```
# rw
# pacman -Syu
```
3. Edit `/etc/kvmd/janus/janus.plugin.ustreamer.jcfg` and add the following lines at the end:
```
audio: {
device = "hw:0,0"
tc358743 = "/dev/kvmd-video"
}
```
4. Enable the basic audio in the EDID:
```
# kvmd-edidconf --set-audio=yes
```
5. Reboot the device:
```
# reboot
```
6. Your host will detect the possibility of audio output via HDMI. Mac OS usually connects automatically, Windows requires manual indication, Linux will require a ritual shamanic dance. In any case, make sure that the audio is output via HDMI on your host.
7. Open the PiKVM Web UI. Click the **System** menu and switch the video mode to **H.264 / WebRTC**. After that, the volume slider will appear under the switch. Increase it to the maximum and have fun.
!!! warning
* After the page is reloaded, the audio slider will be reset. This is a technical limitation in all browsers to avoid annoying audio ads.
* If something doesn't work, check the log: `journalctl -u kvmd-janus`.
* Please report about problems [here](https://discord.gg/bpmXfz5) (preferred) or [here](https://github.com/pikvm/pikvm/issues/97).

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9. !!! warning "IO ports and other things"
**Before using GPIO** pins to control a relay, KVM switch, or anything else, be sure to [check the HAT pinout](#io-ports-and-jumpers). Many ports are busy with internal functions. Before using them for your own use, you must disable them, otherwise you may damage the device.
10. **You can also try the experimental [audio forwarding](audio.md){target=_blank}**.
## ATX connection