FIX: About 2000 (!!!) videos have been marked as videos instead of games or DLCs. (I left a few DLCs such as Indie Game The Movie's Special Edition, or stuff that seems to have downloadable EXEs in addition to videos.)
This is really a big limitation on BVG's database... It treats videos (most videos?) like games. Also, considering there are many shows on Steam (mostly anime TV or game documentaries), that's an awful lot of entries in the database that are absolutely useless for trading purposes. (Basically, most of these episodic videos are included in a package, and it's the package that's (rarely) tradable, not the individual videos.)
I spent several hours on this; in the end I was tired and started doing mass conversions (e.g. Sailor Moon, Power 'Get that out of Steam!' Rangers, Hunter X Hunter, CS:GO & Dota player profiles...), I hope I didn't flag anything as a video by mistake, if you find any issues feel free to contact me. I estimate there are less than 100 videos remaining to be flagged, but the rest has to be done manually and I stopped after another ~100 such manual operations. It's really boring.