I'm was over at a friend's and ran into an issue on his laptop PC. He's got it hooked up to his TV (1080 or 4K, can't remember) via HDMI. Using the default emulator/core (mupen64), all games only show in a tiny square on lower left side. I changed the "advanced" settings to use another emulator/core and screen size was OK but video was very laggy and sound was choppy. I would like to get mupen64 to work correctly as that's given me the best results on my PC. Do I need to edit the video settings in the mupen64 config file? What numbers do I use? TV Resolution? Thanks for your help!
*Edited to clarify details.