On 12/13, camcorder FCs upon ending the recording. No file created. I'm gunna try 11/5 camera and see if that works. If still problems, I'll try MIUI camera.
EDIT: 11/5 camera on 12/13 build doesn't FC, but the video file is corrupt and won't play. Trying MIUI camera next.
EDIT #2: MIUI camera seems to work fine with recording (only did 1 test, but it succeeded where the others failed.) Also, I noticed that the files from the other runs WERE in my SD card, and would play, but idk what happened that changed that.
CONCLUSION: For now, I'll stick with 12/13 with MIUI camera