In Recast for Business, open Stream Inputs and choose + Stream Input. Pick RTMP or SRT — the choice is fixed once the input is created.
Recast then shows the values your encoder needs. Copy them from there rather than retyping them:
Note that an SRT input labels its credential STREAM ID, not Stream Key. It is the same value, under the name SRT uses for it.
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.
Configuration is done through the unit's web interface. Find its address from your network, or from the device's display where fitted.
Use no more than 50% of your measured upload bandwidth.
Encode in H.264, not HEVC. Videon units support HEVC and it is tempting on a constrained link, but Mux's live ingest expects H.264. Set it explicitly.
These are set under Encoder Control → Encoders. The keyframe interval appears as GOP Size or Keyframe Interval; at 30 fps use 60, at 25 fps use 50.
global-live.mux.com6001pbkeylen 16)500 msKey length must be 128-bit. Mux requires it, and 256-bit fails the handshake with an error that does not point at the cause. This is the most common SRT mistake across all encoders.
Do not put the stream key in the URL field as a query parameter. Videon takes host and port as discrete values and will not parse ?streamid= out of them — that is what the dedicated Stream ID field is for.
European facilities can use eu-west.live.mux.com instead of the global host.
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.
rtmps://global-live.mux.com:443/appIf your firmware will not accept rtmps://, use rtmp://global-live.mux.com:5222/app.
Three SRT outputs, one uplink. The unit can run several outputs at once, but they share your connection. The 50% bandwidth headroom rule applies to the total of everything the unit is sending, not to the Recast output alone.
Outputs need a source assigned. An output with no encoder selected will appear configured but send nothing, and the symptom is a stream that connects and then shows no video. Check the source assignment before anything else.
HEVC is not supported by Mux live ingest. Set H.264 explicitly on the encoder feeding this output.
Do not chase low latency. Recast streams run at standard latency (20–30 seconds) by design. Videon hardware can do very low latency point-to-point, but that is not what is happening here.
One protocol per stream input. A Recast stream input is created as either RTMP or SRT and cannot be switched afterwards.
Check the stream input is attached to a video and that the video is not a draft. The unit will report a healthy output while Recast rejects it.
Then check the output has an encoder assigned as its source — an unassigned output connects and sends nothing.
Then wait a full 30 seconds before concluding anything.
Check the SRT statistics. A rising retransmission rate means the link cannot sustain the bitrate — reduce it, or raise the latency to give SRT more room.
You have 30 minutes to reconnect before Recast treats the stream as ended.
Compare the encoder's configured bitrate with what the output statistics report actually leaving the unit. A gap between them means the network is the constraint; no gap means look at the source signal instead.
Confirm the audio encoder is AAC-LC at 48 kHz stereo, and that the correct embedded audio pair is selected.
Prefer embedded SDI or HDMI audio over a discrete input so audio and video share a clock.
Include the model and firmware version, which output slot you used, the protocol, and a screenshot of the output statistics page.
More detail: Recast live ingest reference
