Help! In-Game Video Recordings Are Distorted Or Won't Play

I need some help again. I recently used the in-game video recorder to document an issue with a butler and to record some lot layouts before transferring my lots and households to a new save. I'm moving them because I ran into a problem I wasn't able to fix (see linked Reddit post).

I also hadn't known NPCs would keep the items they bought from my Sims' store, causing save file bloat. I've already found a way to prevent that with gummilutt's Simulated sales in OFB business made optional and lot-based mod, but I also want to remove the existing excess items from NPC inventories en masse.

However, when I tried to play back the videos, I ran into this problem: Imgur video link. I'm not mad, I'm just disappointed; at least I backed up my old save before I started the transfer. Does anyone know how to fix it or, at least, point me in the right direction?