here's a couple projects I've done with an LED matrix marquee RetroPie based ==>https://www.instructables.com/id/Vertical-Bartop-Arcade-With-Integrated-PIXEL-LED-D/ PC Based ==>https://www.instructables.com/id/Arcade-Machine-With-Changing-LED-Marquee/ Here's a guide for setting up this LED marquee and RetroPie ==>http://ledpixelart.com/files/retropie/ . Runcommand onstart and onend is used here. When a new game is launched, a script runs which passes the rom name to the LED marquee software (http://pixelcade.org) which is then displayed on the panels. Both still image PNGs and GIF animations can be displayed by game. This project also includes artwork that has been manually re-mastered for 128x32 for that classic 8-bit look. Disclaimer, I'm the creator for this project and sell these as kits.

you could try this project http://pixelcade.org , includes artwork for 128x32 too. Disclosure, I'm the creator of this one and sell them as kits.

@mayki I would imagine it would have to be code inside of emulationstation that would know what you have selected and what system. So far from what I've seen online, users have gotten dynamic marquees to work inside of mame and using hyper spin. I haven't seen a retropie example yet.