I followed the guide to play back videos in unreal engine and it worked. I even managed to make it work in the Editor (so the video plays without pressing play) with an extra blueprint.
However in the nDisplay output the video doesn’t show, it’s just white. I’m using another computer to render the output via switchboard.
I tried rendering it on the same computer as the editor and now it just shows a still frame of the video. Slightly better than white but still nothing.