The below commands are tailored for Linux, as file paths are different for Windows. They need to be ran with the sudo -u plex prefix for proper user access permissions.
Get list of libraries'/usr/lib/plexmediaserver/Plex Media Scanner' --list
'/usr/lib/plexmediaserver/Plex Media Scanner' --analyze --manual --server-action intros --section LIBRARY_ID
'/usr/lib/plexmediaserver/Plex Media Scanner' --analyze --manual --server-action credits --section LIBRARY_ID
sqlite3 '/var/lib/plexmediaserver/Library/Application Support/Plex Media Server/Plug-in Support/Databases/com.plexapp.plugins.library.db' '
SELECT MDI.id, file, title, MDI."index", hints, GROUP_CONCAT(T.text) AS taggings
FROM media_parts AS MP
INNER JOIN media_items AS MI ON MI.id=MP.media_item_id
INNER JOIN metadata_items AS MDI ON MDI.id=MI.metadata_item_id
LEFT JOIN taggings as T ON T.metadata_item_id=MDI.id AND T.text IN ("credits", "intro")
GROUP BY MDI.id'