Dolphin8564

What others have mentioned and what has worked for me is deleting the files within the Codec folder. At first this didn't work, and it's because I realized that when I created the container, I saved it in a specific location and then deleted it later on, but it kept those files on my server. Down the road I created the container again in a different location. I realized I was looking at the old location's files and deleting the codec there. Once I found the correct one I deleted the Codec files and it worked! I cleaned up my files and systems after that to make sure they were all organized properly.
 
Beyond that I'm not sure what the solution is. This seems to be on Plex's end because when they come out with a new update it seems to break the codec files. I will say that I haven't had to do this for quite a while, but whenever I do, it's incredibly annoying.
 
EDIT: I'm marking this as the solution because it does work for people, but I encourage others to continue reading and contributing to this thread if this solution is not working for you.