Just to add options, there is also the relatively new OpenMediaTransport ( https://www.openmediatransport.org/ ) that aims to be a licensing free, open alternative to NDI. At the moment, there are a number of programs supporting it, but sadly not many cameras, stand alone converters, nor audio gear. If line to see that change.

Generally NDI is not widely used in professional AV. There's a fair bit in prosumer, and a _little_ bit in the low end of pro. But the fact that it's a proprietary protocol (they can claim it's “open” all they want, but the SDK is closed source, there is no spec and they sue people who make open reimplementations), has poor image quality (it's roughly MPEG-2 intraframe, i.e., not very good), has poor latency and isn't very reliable makes it a no-go for most larger installations.