I have created my own YouTube & Arcade Snap / Videopreview downloader.
It's not super pretty but works pretty well.
Arcade is perfect because i use progettosnaps direct download, consoles are OK'ish... i currently try to limit the search results to one provider to eliminate false positives.
So if that channel doesn't have the video for your game, you might get something strange... BUT I ADDED A SKIP BUTTON!
If you know other youtube channels than arcade forever feel free to leave a comment and i'll take a look at it
Unzip the file and put the folder in your Launchbox/Plugins/ dir.
Rightclick a game or games and choose get snaps,
click yes for consoles etc., click no for arcade / mame.
Hit Download, wait, done.
Btw. if you're wondering why there is an .exe file... well i'll probably make it standalone too to scan the whole library and im lazy so i didn't want to start two projects
I have uploaded a video of it in action here: