I needed to rotate a cell phone video but didn't find anything on MSFN so had to search elsewhere. This is just a quick note for anyone else that needs to do this. VLC can kinda do it, but it is cumbersome and ill-supported to save/export/convert the output. Use AVIDemux to rotate and save. It works pretty well. I used an old portable version that I found here to avoid going through an installer process. Then I used the steps outlined here. Pretty quick and easy.