Managing TV overscan on RetroPie (and pretty much any application)

I have coverter my Linux home media center to be a retro-gaming emulation system as well by installing RetroPie on top of the main Linux Mint OS followng these instructions.

What I noticed however is that the overscan caused by my TV could not directly be compensated by any of the RetroPie software (this was not an issue when I was using this as a media center since Kodi manages overscan easily).

Most of the solutions found on the Internet advise to change the TV settings, but these were not available on my model, so I found the following idea from this post :

/usr/bin/xrandr --output HDMI1 --panning 1280x720 --transform 1.05,0,-35,0,1.07,-24,0,0,1

I had to use the –panning option otherwise I did not manage to get the results to work the way I wanted. You should obviously set the numbers above based on your own setup (you could start with that and tweak them one by one). In case you end up with a wrong setting, look at this.

Once the settings worked for my setup, I embedded this command in a bah script that I added to the Xfce startup list.