> For the complete documentation index, see [llms.txt](https://captivatehelp.newbluelive.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://captivatehelp.newbluelive.com/set-up-your-production/chapter-index/output-graphics-with-omt.md).

# Output graphics with OMT

> *Availability — included in Enterprise.*

OMT (Open Media Transport) is an open-source, low-latency video transport. It’s an alternative to NDI for receivers that support it — such as omtplayer, OBS with the OMT plugin, and other OMT-compatible applications.

OMT and NDI are peers in Captivate. Pick whichever your downstream tooling supports best.

In the Captivate playout window, click the **Program Out** menu and choose **OMT**.

Each channel on the Channel panel becomes a unique OMT source on your network.

## How OMT sources appear to receivers

Captivate publishes OMT sources with these names:

* **Single channel** — `Captivate`
* **Multiple channels** — `Captivate_<ChannelName>` (for example, `Captivate_Lower_Thirds`)

If you change the number of channels (from one to two or vice versa), the source name pattern changes — receivers locked onto `Captivate` will lose the stream when you add a second channel.

## What works the same as NDI

* Each channel is a separate OMT source.
* Audio is included.
* Channel renaming is supported by double-clicking the channel name.
* The number of channels you can create is set by your Captivate license.

## What’s different from NDI

* **No tally** — when a receiver puts your OMT source on preview or program, Captivate’s tally indicator does not light up. (Tally is supported on NDI but not on OMT.)
* **TCP transport** — OMT uses reliable TCP, which means slightly different network behavior than NDI’s UDP-based discovery and delivery. For most local networks no configuration change is needed.
* **Discovery ports** — OMT uses ports 6400–6600 by default. If your firewall blocks these, receivers will not see the Captivate source.

## Tips

* To rename a channel, double-click a channel name, type a new name, and press **Enter**.
* To create a new channel, click the **+** button to the right of the channel names. (Whether new channels can be added depends on your Captivate tier.)
* To delete a channel, right-click (Windows) or Control + click (macOS) a channel name, choose **Delete**, and confirm.
* Click a graphic’s **Play** button to broadcast the graphic on its matching OMT source. You can monitor it in Captivate’s Program Monitor panel.

## When to choose OMT vs. NDI

| You want…                                          | Choose                      |
| -------------------------------------------------- | --------------------------- |
| Tally lights to follow your switcher               | **NDI**                     |
| To receive in OBS, Wirecast, vMix, TriCaster       | **NDI** (broadly supported) |
| To receive in omtplayer or an OMT-only application | **OMT**                     |
| Lowest latency on a reliable LAN                   | Either; test both           |

## See also

* [Output graphics with NDI](/set-up-your-production/chapter-index/output-graphics-with-ndi.md)
* [Set the project format](/set-up-your-production/set-up-your-project.md)


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