OBS Studio is a popular and easy to use streaming software. Now you can stream into your Channels DVR and record or watch live from any Channels client.
(Spent a few minutes trying this and just wanted to document the settings required so others can play and explore.)
OBS settings (based on this):
In OBS you can configure any number of inputs, such as USB HDMI capture, webcam, and even web browsers (not sure how well it works). I used the latter just to test things out:
Once you hit "Start Recording", then setup Custom Channel in your DVR:
#EXTM3U
#EXTINF:-1 channel-id="obs-1",OBS Test
udp://224.0.0.55:1234
and you can watch/record the OBS stream from your Channels DVR clients:
(Note that NBC site only shows this spinner so I don't think this is a replacement for Chrome Capture. But OBS makes it very easy to integrate cameras and HDMI USB devices).