PlexIntroEditor VS MarkerEditorForPlex

That has turned into Plex Intro Editor, an app that allows you to add, edit, and delete intro markers for episodes in your library. You can view stats (X episodes have no markers, Y have 1, etc), add a marker to an episode that Plex couldn't detect, shift all markers for a season forward 2 seconds, add an extra marker if a show has multiple intros, and pretty much anything else you might want to do with an intro marker.

It also linked to an intro editor I made that makes it easier to add/edit/delete markers, though there is a fair bit of initial setup required to get it running.

It also includes a link to an in-progress PlexIntroEditor project I've been working on, which adds a nicer UI layer that allows you to manually edit markers: https://i.imgur.com/oYzKv0h.png. It definitely hasn't been heavily tested, but should be fine for just editing existing markers.

If you're really brave, I created this program that makes it a bit easier to modify (or even add/remove) markers, but it's not heavily tested, is not polished (i.e. very likely has bugs) because my real job got in the way, and while editing existing markers shouldn't cause issues, adding/deleting them is completely unsupported by Plex so has the potential to break if Plex changes how intro markers are stored.

If you're really brave, and willing to run a stranger's first ever Node project, I've been working on a tool for myself that makes editing/adding/deleting intro markers a bit easier, though as the project mentions, is far from polished/bug free, and is very much a work in progress.

Full GUI editor: https://github.com/danrahn/IntroEditorForPlex

If you really want them you could hackily add them manually, but they'll get wiped out and need to be restored any time you add another episode or reanalyze a season.

There is a decent third party workaround to this. Marker Editor for Plex.. It allows you to manually edit/change/add the intro and credit detector markers.

Marker editor for Plex, for manually editing intro and credit markers.

Note, I have tried IntroEditorForPlex, but it could never connect to the database.

There's also this editor (self-plug), which allows you to add/edit/remove markers. There are some downsides, like Plex wiping out customizations when a season/movie is reanalyzed, so you may occasionally have to manually restore them.

The latest beta release of the tool associated with the link above can make it a bit easier, though I haven't thoroughly tested mass-delete yet (hence why it's still a beta release).

From what I've seen, it mostly gets confused whenever there's text at the end of an episode, which is especially common in quiz/panel shows that often have a scoreboard near the end. I've been making unsupported manual edits for some items that I've noticed Plex is getting wrong, but it's definitely not a sustainable approach (and they get overwritten once an episode/season is reanalyzed).