Plex randomly failing to detect certain episodes

Were you expecting Plex to recognise the new files it on its own, or did you trigger ‘Scan Library Files’?

How are your files named and organised in subfolders?

Are your video files using the mp4/m4v container format?

preparation

Go to

  • Settings - Server - Agents - Shows - TheTVDB

In there, grab the line ‘Local Media Assets’ with your mouse and drag it downwards, so it ends up being at the bottom of the stack of active agents.
Repeat the same under

  • Settings - Server - Agents - Shows - TheMovieDatabase
  • Settings - Server - Agents - Movies - Plex Movie
  • Settings - Server - Agents - Movies - TheMovieDatabase

main course

  1. Look up your show on TheTVDB
  2. Take the title as it is used on TheTVDB. If there is something in parentheses, take that too. If the title contains invalid characters (depends on your file system), like § : % *, simply leave them out.
  3. Check the naming and the folder structure of your show. Name the top folder of the show exactly after the title on TheTVDB. No abbreviations. No additional subfolders. No aliases. Add the (year) in parentheses of when episode 1 of season 1 of this show was aired.
  4. Name the episode files according to the above linked naming guide. Use the same title as for the top folder. Show's Title (year) - s01e01 - additional info.ext (’- additional info’ can be left out)
  5. After you corrected the naming and folder structure, perform the Plex Dance with all files for this show.