Please note: I'm using a Synology NAS which runs on Linux. It may seem odd to use the 'inotify' command for EAC3, but apparently that's what Plex is doing. If you have a large library, the 'inotify' command will reach its limit by watching at all your files, directories, and sub-directories, which will cause EAC3 to hang or fail. Why does 'Scan my library automatically' affect EAC3? From what I understand, Plex uses the 'inotify' Linux command to process EAC3. You also may need to stop Plex on your NAS and then re-start it after you save this un-checked this option, but probably not. Make sure this option is un-checked, then click 'SAVE CHANGES' (bottom of screen). The top item on the right-hand side of your screen should be 'Scan my library automatically'. This should open a bunch of settings on the left of your screen. Click the WRENCH icon (top right) or click on your 'Account Settings' (top right). Where is 'Scan my library automatically' located? Open your web browser and open Plex ( ). You will need to manually scan your library when you add new files, or you can set 'Scan my library periodically' to 15 minutes, 30 minutes, 1 hour, etc. I know this is a nice option to have, but if you have a large library, EAC3 Audio will not transcode correctly with 'Scan my library automatically' turned on (checked). Simply turning off 'Scan my library automatically' fixed the problem for me. After many days of research and trial & error, I finally solved the issue with Plex hanging at 33% due to EAC3 (also called Enhanced AC-3, EAC, E-AC3, E-AC-3, E-A-C-3, and EC-3.) If you have a very large library, this should fix your problem.

Plex media server update hangs