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Roku TV Inputs

I am working on a Roku TV app (TCL Roku TV) to add text on top of live video. It accepts text  input from ECP and displays it on screen. I have this working using roTuner with any of my local TV channels, however I really would like to be able to use it with the CVBS or HDMI inputs. How do I setup HDMI or A/V inputs on a video node. Specifically, what is the streamFormat and what needs to go into content.streams.

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Re: Roku TV Inputs

Was it ever determined if this was possible to do?  I'm trying to make something similar that requires being able to show HDMI on screen with text around it. I've been searching through the documentation but haven't found anything on using the data from the HDMI port.

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