I am streaming content from Plex, so I don't think it's a DRM or HDCP problem. I'm new to this, so could be wrong.
The capture card I am using states it is HDCP 2.2 and has EDID.

When it stops working, this is what the logs say.
2024-12-29T17:06:49.257Z [V4L2] (ERROR) Frame too small: 0 != 614400
2024-12-29T17:06:49.376Z [IMAGETOLED|TV Ambient Lighting] (DEBUG) (ImageToLedsMap.cpp:112:ImageToLedsMap()) Total index number is: 2084 (memory: 2084). Reduced pixel set factor: 0, Accuracy level: 2, Image size: 107 x 80, LED areas: 92
2024-12-29T17:08:09.283Z [MUXER|TV Ambient Lighting] (DEBUG) (PriorityMuxer.cpp:293:setInputImage()) Priority 240 is now inactive
2024-12-29T17:08:09.284Z [MUXER|TV Ambient Lighting] (DEBUG) (PriorityMuxer.cpp:422:updatePriorities()) Set visible priority to 255
2024-12-29T17:08:09.284Z [HYPERION|TV Ambient Lighting] (DEBUG) (Hyperion.cpp:645:handleSourceAvailability()) No source left -> Pause output processing and switch LED-Device off
2024-12-29T17:08:09.284Z [LEDDEVICE|TV Ambient Lighting] (INFO) Switching device ws281x OFF
2024-12-29T17:08:09.284Z [LEDDEVICE|TV Ambient Lighting] (DEBUG) (LedDevice.cpp:468:powerOff()) Power Off: ws281x
2024-12-29T17:08:09.284Z [LEDDEVICE|TV Ambient Lighting] (DEBUG) (LedDevice.cpp:363:writeBlack()) Set LED strip to black to switch LEDs off
2024-12-29T17:08:09.285Z [LEDDEVICE|TV Ambient Lighting] (INFO) Device ws281x is OFF