NDI® by Newtek is a protocol for sending A/V data over local area networks.
Note that some sources, including some NDI-capable PTZOptics cameras, may require you to install Newteks' NDI HX Drivers on your Mac. (Check each camera's documentation.)
NDI sources will automatically show up as cameras in Ecamm Live’s camera list, and as a microphone in Ecamm Live’s microphone list.
For information about using ProPresenter to create titles in Ecamm, read this article: