NDI Sources

NDI (Network Device Interface) is a widely used standard for sending video over a local network. pMix can receive NDI sources from cameras, software (OBS, vMix, Wirecast), and hardware devices.

Adding an NDI source

  1. Tap + on an empty source slot
  2. Select NDI
  3. pMix discovers NDI sources on your network automatically via mDNS (Bonjour)
  4. Select the desired NDI source from the list

The source connects and begins displaying in the slot. NDI sources include both video and audio.

Discovery

NDI discovery uses mDNS multicast. For sources to appear:

  • All devices must be on the same local network (same subnet)
  • Your router/switch must allow multicast traffic (most consumer routers do by default)
  • Some managed switches may need mDNS/multicast forwarding enabled

If a source doesn’t appear, try refreshing the source list. You can also check that the NDI source is visible from other NDI receivers on the same network.

PTZ control

If your NDI source supports PTZ (pan-tilt-zoom), pMix can control it via NDI PTZ commands:

  • Pan and tilt — Directional control
  • Zoom — Zoom in and out
  • Presets — Recall saved camera positions

PTZ controls appear automatically when you select an NDI source that advertises PTZ capability. See Camera Control / PTZ for details.

Audio

NDI sources carry audio alongside video. The audio appears in the mixer automatically at the same slot number as the video source. You can adjust volume, mute, and routing independently.

Common NDI software sources

Any NDI-compatible software on your network can be received:

  • OBS Studio — Enable NDI output plugin
  • vMix — Built-in NDI output
  • Wirecast — NDI output support
  • NDI Studio Monitor — For testing
  • Skype / Zoom — Some video call apps can output NDI

Performance tips

  • NDI uses significant network bandwidth (typically 100–150 Mbps per 1080p60 source)
  • Use a wired Ethernet connection for NDI sources when possible (via USB-C Ethernet adapter on iPad)
  • If using Wi-Fi, ensure your network has enough throughput for all simultaneous NDI streams
  • NDI HX (compressed NDI) sources work well over Wi-Fi at lower bandwidth