Covers the Teradek VidiU Go, VidiU X, VidiU Pro and the original VidiU on-camera encoders.
Use RTMP(S). No VidiU can send SRT to Recast. That is not a limitation of your firmware or your settings — the range has no SRT stream mode at all. [Full explanation below](#why-there-is-no-srt-here).
All VidiU hardware is discontinued. Teradek's current encoder line is Prism — see the Prism guide, which does SRT natively and needs nothing else in the path. The VidiU units keep working and Recast keeps accepting them; there will just be no more firmware.
All four follow the same RTMP setup below. What differs between them is the resolution ceiling and which cloud service, if any, the unit can reach.
In Recast for Business, open Stream Inputs and choose + Stream Input. Pick RTMP — the choice is fixed once the input is created, and an SRT input is of no use to a VidiU.
Recast then shows the two values your encoder needs. Copy them from there rather than retyping them:
Then confirm all three of these, or your stream will be refused:
A new stream input is switched off. Recast switches it on only when it is attached to a live, non-draft video.
You have three options, in order of practicality:
it. Much easier than the front panel for pasting a stream key.
Core for the VidiU Go, Sharelink for the VidiU X. The VidiU and VidiU Pro reach neither.
screen is slow and error-prone.
Use the web interface if you possibly can.
The VidiU range is usually used on cellular or venue wifi, so 720p is the sensible default.
Use no more than 50% of your measured upload bandwidth, measured at the venue on the connection you will use.
Which URL? Recast displays rtmp://global-live.mux.com:5222/app as your RTMP STREAM URL, and that works. This guide uses rtmps:// on port 443 instead: it is the same Mux ingest wrapped in TLS, so your stream key is not sent in clear text, and port 443 passes through restrictive venue networks that block port 5222. Use whichever your encoder supports.
This is the only path for VidiU hardware, and it works well.
rtmps://global-live.mux.com:443/appIf your firmware will not accept an rtmps:// URL, use rtmp://global-live.mux.com:5222/app. European users can substitute eu-west.live.mux.com.
The VidiU range does not have an SRT stream mode. Teradek's own reference guide lists the VidiU X's video transport protocols as RTMP, RTMPS, AirMix, Sharelink bonding and RTSP, and its Streaming menu offers Sharelink, RTMP(S), RTSP and AirMix — there is no SRT entry to find. The VidiU and VidiU Pro are older and more limited still.
The VidiU Go is the one model where SRT is mentioned, and the wording matters: Teradek says SRT, MPEG-TS and RTSP are unlocked "utilizing Core". SRT is a capability of Teradek's cloud platform, not of the box on your camera.
So there is no firmware update to wait for and no hidden Stream ID field to hunt down. If you need SRT into Recast from a VidiU Go, the SRT connection is made by Core, not by the unit:
VidiU Go ─Teradek transport─▶ Core ─RTMP(S) or SRT─▶ Mux ─▶ Recast
This is rarely worth doing for SRT alone. SRT earns its place on an unreliable first mile, and that leg is the VidiU to Core — which Teradek already protects with its own bonded transport. The Core to Mux leg is cloud to cloud over reliable networking. Adding Core buys you multistreaming, remote management and cloud recording; it does not meaningfully improve the resilience of a stream that was already going to be fine.
If you want Core for those other reasons, use the Teradek Core guide. If what you actually want is SRT, a Prism does it natively in one hop. Otherwise use RTMPS above, which is a perfectly good way to stream.
Sharelink bonding. The VidiU Go and VidiU X can bond cellular modems with wifi or ethernet for a more resilient uplink. Where you have it, use it — it does more for reliability than any encoder setting, and far more than SRT would have. Note that it changes your available bandwidth dynamically, so leave generous headroom. Sharelink is a paid subscription, separate from Core.
Battery and heat. These units run warm and drain quickly under sustained encoding. Use mains power or a large external battery for anything over about half an hour.
Front-panel entry is a false economy. Stream keys entered on the front panel are frequently wrong by one character, and the resulting failure looks like a server problem. Use the web interface.
Do not chase low latency. Recast streams run at standard latency (20–30 seconds) by design.
One protocol per stream input. A Recast stream input is created as either RTMP or SRT and cannot be switched afterwards. Create an RTMP one for a VidiU.
Check the stream input is attached to a video and that the video is not a draft. The unit will show a healthy broadcast while Recast rejects it.
Then wait a full 30 seconds before concluding anything.
On cellular or venue wifi this is nearly always signal or congestion. Move the unit, then drop a quality tier.
Where Sharelink is available, enabling it will ride out interruptions that would otherwise end the stream.
You have 30 minutes to reconnect before Recast treats the stream as ended.
Reduce the bitrate. On a small on-camera encoder the uplink is almost always the constraint, not the encoder.
Confirm the correct audio input is selected — embedded HDMI or SDI audio, or the analogue input. Selecting the wrong one gives silence with no error.
Prefer embedded audio so audio and video share a clock.
Include the model and firmware version, whether Sharelink or Core is in use, the connection type, and your bitrate and resolution.
More detail: Recast live ingest reference
