Encoders and fallback
Use Larix or Moblin, tune SRT latency, and switch to Fallback when a feed drops.
The fastest path for most streamers is the phone or browser app — see Get started. This page covers third-party encoders, the dashboard latency probe, and Advanced Scene Switcher macros that keep the show on a fallback scene while a remote feed reconnects.
Third-party encoders
If you publish with Larix, Moblin, or another SRT/RTMP encoder instead of the VISP app:
- Sign in to the portal with Twitch or Kick.
- Open Video sources and choose Add device.
- Choose Copy next to Add this to video source and paste the URL into the sending encoder.
- To use RTMP instead of the default SRT URL, switch the dashboard to Advanced.
Each device has an independent publish credential, so rotating or revoking one does not interrupt the others. OBS read credentials are managed separately.
Use SRT by default and RTMP only when the network blocks UDP. Configure H.264 video, AAC audio, constant bitrate, and a two-second keyframe interval. Enable adaptive bitrate in Larix on cellular connections.
Only one publisher can own a path. The first device remains connected; a second device cannot pre-connect for a seamless handoff.
Tune SRT latency
Run the dashboard probe on the same network the encoder will use. It sends seven sequential requests to the relay and uses the median RTT. Select the real network profile and keep the rounded recommendation:
| Profile | Multiplier | Minimum |
|---|---|---|
| Wired | 3× RTT | 120 ms |
| Wi-Fi | 4× RTT | 300 ms |
| Cellular | 6× RTT | 600 ms |
Cellular jitter is bursty; do not tune below the recommendation.
OBS scene collection
In OBS, choose Scene Collection → Import and select the downloaded JSON. It
contains a fallback scene and one Media Source scene per active relay path. The
sources use ffmpeg_source, MPEG-TS, low buffering, and automatic reconnects.
After creating a path, open Advanced → OBS read credentials, choose Reveal read URLs, and either copy the new path's OBS URL or download a fresh scene collection. You do not need to rotate the read credential. Rotate read invalidates every existing OBS Media Source, so use it only when you intend to replace them.
Advanced Scene Switcher
Create a Media condition for each generated Media Source. A Source condition checks scene visibility and can deadlock the switch; Media checks playback state.
For every macro:
- Enable both the condition and action toggles.
- Require Playing for 2 seconds before switching to the live scene.
- Require Stopped for 3 seconds before switching to Fallback.
The debounce prevents scene flapping while SRT reconnects.