When you hit the “Menu” button on the OSMC remote while playing a video, an overlay with information like video resolution, audio codec, etc. is shown. Please add the following information:
Output resolution and frame rate
Output format (YUV or RGB) and bit depth
If it is not possible/easy to add to that particular screen, then please create an OSMC-specific screen that can show that info while video is playing. Knowing what the OSMC device is sending without having to resort to debug logs or reading files in the /sys filesystem can help speed up debugging for people.