TV brand/model? Software name and version?
Also, 3m x 3m would be a square screen. Nothing (here in the US anyway) is broadcast in a completely square frame. Old material is 4:3, and all new material and broadcasts are widescreen 16:9. Viewing either of those in a completely square resolution will either crop off the edges of the frame or display with black bars on the top and bottom. How or if it's even possible, will depend on the software that you are using.
Also, 3m x 3m would be a square screen. Nothing (here in the US anyway) is broadcast in a completely square frame. Old material is 4:3, and all new material and broadcasts are widescreen 16:9. Viewing either of those in a completely square resolution will either crop off the edges of the frame or display with black bars on the top and bottom. How or if it's even possible, will depend on the software that you are using.