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.
Makito X4 encoder firmware 1.2 or later is required for SRT to Recast.
Mux identifies your stream by the SRT Stream ID. The Makito X4 gained a Stream ID field in firmware 1.2, alongside stream failover and dual-NIC support. Below 1.2 there is no way to tell Mux which stream you are, so the connection will be refused regardless of your other settings.
Firmware version is shown on the web interface's status or about page. If you manage a fleet through Haivision EMS, you can check and upgrade centrally.
Use no more than 50% of your measured upload bandwidth.
Encode in H.264, not HEVC. The Makito X4 is capable of HEVC and it is tempting on a constrained link, but Mux's live ingest expects H.264. Set the encoder's codec explicitly rather than trusting the preset.
The keyframe interval is set as GOP Size in the encoder's video settings. At 30 fps use 60; at 25 fps use 50.
This is the recommended path for Haivision hardware.
global-live.mux.com6001500 msEncryption must be AES-128. Mux requires a 128-bit key. The Makito X4 offers AES-128, AES-192 and AES-256; the latter two will fail the handshake with an error that does not identify the cause.
European facilities can use eu-west.live.mux.com in place of the global address.
500 ms is a good starting point on a facility connection. On a long-haul or satellite path, set it to at least four times the round-trip time. The Makito X4's statistics page reports the measured RTT once connected, so you can tune it with real numbers rather than guessing.
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 does not accept an rtmps:// URL, use rtmp://global-live.mux.com:5222/app.
Multiple simultaneous streams. The Makito X4 can run several outputs at once. Each consumes uplink bandwidth, so the 50% headroom rule applies to the total of everything the unit is sending.
Dual NIC. Where the unit has two network interfaces, make sure the stream is bound to the one with the internet route. A stream bound to a private production VLAN will fail to reach Mux with an error that looks like a credential problem.
HEVC is not supported by Mux live ingest. Set H.264 explicitly.
Do not chase low latency. Recast streams run at standard latency (20–30 seconds) by design. The Makito X4 can achieve very low glass-to-glass latency in a point-to-point workflow, but that is not what is happening here, and tightening the GOP will only make the stream more fragile.
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 encoder will report a healthy connection while Recast rejects it.
Then wait a full 30 seconds before concluding anything.
Check the SRT statistics page. A high retransmit rate with rising packet loss means the link cannot carry the bitrate — reduce it, or raise the latency to give SRT more room to recover.
You have 30 minutes to reconnect before Recast treats the stream as ended.
Look at the encoder's output statistics rather than guessing. If the encoder is sending cleanly and viewers still stutter, the problem is bandwidth between the encoder and Mux, not the encoder itself.
Confirm the audio encoder is AAC-LC at 48 kHz stereo, and that the correct audio pair is selected — the Makito X4 can carry many embedded pairs and will happily encode a silent one.
Prefer audio embedded in the SDI signal over a discrete input so both share a clock.
Include the model and exact firmware version, the protocol, the stream configuration, and a screenshot of the stream statistics page. For SRT issues the statistics page usually contains the answer.
More detail: Recast live ingest reference
