# Outputs · NDI · SRT · RTMP · External: NDI

> Alpha over the network.

Glider documentation · Playout & On Air · Web page: https://cgglider.com/docs/outputs/ndi/

Sections of this page: [How outputs work](https://cgglider.com/docs/outputs.md) · [Frame timing & colour](https://cgglider.com/docs/outputs/timing.md) · [Sources, channels & signals](https://cgglider.com/docs/outputs/sources.md) · [NDI](https://cgglider.com/docs/outputs/ndi.md) · [External (SDI) & fullscreen](https://cgglider.com/docs/outputs/external.md) · [SRT](https://cgglider.com/docs/outputs/srt.md) · [RTMP streaming](https://cgglider.com/docs/outputs/rtmp.md) · [API](https://cgglider.com/docs/outputs/api.md)

NDI outputs use the NDI runtime already on this machine: install NDI Tools (ndi.video/tools), or point Settings › Outputs › Runtimes at the runtime's folder. Glider does not ship the runtime. The Status column counts the receivers watching each output.

- Frames are BGRA at the page's size and rate, with the graphic's own alpha — a vMix NDI input keys it with no further setup.
- Groups are optional, comma-separated, as in NDI Access Manager.
- On macOS the first NDI output asks for Local Network permission; allow it, or receivers cannot see the source.

> **Note:** NDI® is a registered trademark of Vizrt NDI AB.