NewTek Spark and PTZ Camera
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For the handful of you into NDI (and the rest of you all who should be), NewTek just released it's Spark HDMI/SDI to NDI boxes and PTZ Camera.
The spark comes in HDMI and SDI flavors, and will connect that source as an NDI source on either a wired or wireless network. They're rather cheaper than bird-dog's option. Unfortunately no 4K, but I may be the only one that cares about that.
The PTZ is will output directly to a network as an NDI source (or via HDMI or SDI), and is controllable (pan/tilt/zoom) via that network as well. It also uses Power-over-Ethernet, which is surprising and really cool.