Marshall CV730 NDI and SRT workflow boundaries with Callaba
More live video workflow notes and product updates.
PTZ camera transport decision hub
The Marshall CV730-ND3 combines PTZ acquisition with several IP output choices, but its transports are not all simultaneous. It is also listed by Marshall as discontinued. A safe deployment begins with the exact ND3 or ND3W model, installed firmware and output mode, then treats Callaba as the receiver and operations layer rather than as a camera-control replacement.
Written by Iurii Pakholkov, founder of Callaba. Materially reviewed on July 17, 2026 against the official sources listed below.
Choose the correct Marshall CV730 NDI and SRT workflow boundaries with Callaba
| Path | Operational role | When to choose it |
|---|---|---|
| CV730-ND3 direct SRT | The PTZ camera sends its encoded program feed to a reachable Callaba receiving endpoint. | Choose for internet contribution when the camera is in the documented non-NDI streaming mode. |
| CV730-ND3 RTMPS fallback | The camera uses its documented RTMPS output when UDP reachability or the selected receiver requires it. | Choose deliberately after checking the receiver URL and do not describe it as SRT recovery. |
| NDI HX production path | The camera remains an NDI source inside a managed production network and needs a separate bridge before Callaba. | Choose for local NDI discovery and switching; do not claim simultaneous camera SRT in the conflicting mode. |
Keep the source, handoff and Callaba roles explicit
Source-side responsibility
Marshall owns image acquisition, PTZ movement, focus, exposure, embedded audio, hardware encoding and the camera web interface. The model and firmware determine which IP output controls actually exist.
Transport handoff
The handoff contract records output mode, codec, raster, frame rate, audio, destination, UDP port, delay and any security values. It must also state whether NDI HX is enabled because that changes the available stream family.
Callaba responsibility
Callaba owns the reachable receiving endpoint, transport telemetry, browser Multiview, recording, routing, playback and downstream automation after the camera has produced a valid feed.
Preflight a discontinued CV730-ND3 without copying the wrong mode
- 1. Read the full label and confirm CV730-ND3 or ND3W rather than a current BHN/WHN or an older CV730 variant. Save the firmware version and the official manual revision in the event runbook.
- 2. Choose the production transport before opening ports. If SRT or RTMPS is required, use the documented non-NDI stream mode; if NDI HX is required, plan a separate controlled bridge instead of promising both paths from the camera.
- 3. Create the matching Callaba receiver and align address, port and recovery values. Keep passphrases and Stream IDs outside screenshots, page analytics and shared editorial notes.
- 4. Test video, embedded audio, PTZ operation and network load at the selected 4K or HD profile. Confirm that changing the NDI mode does not silently remove the expected SRT or RTMPS output.
- 5. Verify the feed in Callaba Multiview, inspect transport health, make a short recording and exercise one downstream route. Document a replacement or bridge plan because the ND3 family is discontinued.
After preflight, use the SRT Gateway hub for architecture choices, the SRT Server guide for receiver concepts, Multiview for browser operations, and the SRT API documentation for automation. These shared resources do not replace the model-specific guide linked in the decision table.
Official references reviewed
Capabilities and menu fields can change with hardware revisions, firmware and account entitlements. Recheck the exact model before a production event.
- Marshall CV730-ND3 discontinued product page — Official model status, interfaces, protocol list and output specifications.
- Marshall CV730-ND3/ND3W user manual — Official NDI-mode exclusion, SRT fields, ports and delay controls.
- Marshall CV730-ND3 cut sheet — Official camera, codec and IP protocol summary for inventory verification.
Frequently asked questions
Can the Marshall CV730-ND3 send NDI HX and SRT at the same time?
The current ND3 manual states that RTSP, RTMP, RTMPS, MPEG-TS and SRT streams cannot be used while NDI HX2 or HX3 is enabled. Treat that as a hard mode boundary and verify the installed firmware rather than promising simultaneous output.
Is the CV730-ND3 still a current Marshall model?
Marshall lists CV730-ND3 and ND3W in its discontinued section. Existing cameras can remain useful, but a new design should include firmware availability, support ownership and a tested replacement or external bridge path.
Which codec should the camera use for Callaba?
Select H.264 for the widest downstream compatibility or HEVC only when the camera mode and every recorder, route and destination have been verified. The transport connection alone does not prove codec compatibility.
Does Callaba control the Marshall PTZ camera?
This workflow does not make Callaba the PTZ controller. Marshall or the chosen camera-control system owns movement and image settings; Callaba begins at receiving, monitoring, recording and routing the encoded output.
What should be tested after changing NDI mode?
Confirm the intended SRT or RTMPS output still exists, then verify video, audio, transport statistics, a short recording and the final destination. Mode changes can alter the output family, so repeat the full preflight.
Move from device choice to a tested receiving path
Open the exact-model guide, validate one contribution feed in Callaba, then add recording, monitoring and downstream routes only after the ingest contract is stable.
