@mitu
Figured out how to fake a splashscreen in portable emulation on pc. I opened the batch file in ES that sets it as home and open it.
Changed it to:
set HOME=%~dp0
start "" "emulationstation.exe" --windowed --resolution 1920 1080
start "" "C:\Program Files\MPC-HC\mpc-hc64.exe" "G:\Portable_Game_Station_1.5\load.mp4"
changed the resolution to fullscreen size but kept it windowed so my player can show over it. used MPH-HC set the options to fullscreen when it launchs a file. set it to be "always on top". also selected the player to exit after playing.