Video does not work when I connect my Macbook to a TV using a thunderbolt to HDMI converter. Audio works fine.

I've been trying to connect my macbook to an Insignia TV. The macbook recognizes the TV is connected and changes the display ratio accordingly, but it does so in a jittery way before landing on 1080i after some time.
The audio works fine on the TV from the mac, but it's not picking up any video. When I go to System Preferences>Displays, I get two windows: one for the built-in display, one for the TV. I think this is why I'm not getting any video, but I don't know how to make it just so that the display is for the TV. The displays are mirrored, but I'm still not getting anything. Please help!

Go into System Preferences, then Displays. There should be an option to click on the tv mirroring. Click it and see if it connects to the TV.

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