Can't remove chapter markers in movie playback

I am using Plex Media Server and app on an Nvidia Shield 16g (4TB drive attached as internal). I ripped my large movie collection (mkv, then mp4). I also installed the Sub-Zero plug-in. I am just starting to check my movies and I am finding now that a lot of my movies (not all) are showing channel markers when playing a movie. It shows the chapter marker rather than the subtitle. How do I eliminate those channel markers? When I used HandBrake, I know I didn’t forget to turn off the chapter markers on this many movies. I redid a movie and made sure the channel marker was unchecked and it did play back like I want. Is there a setting I can use in the PMS web to shut those off without having to rerip/encode my movies again? Thanks for the help!

My understanding is chapter markers are part of the file, not something Plex creates/manages.

When editing mkv files using MKVToolNix part of the MKV file is the chapters section (along with audio, video, subtitles, etc). This is why I believe it is a file thing, not a Plex thing.

I’m not sure I follow on the showing chapters rather than subtitles, though.

I know you can remove chapter markers on MKV files using MKVToolNix, but not sure on mp4 or other formats. But even if they were all mkv files, it would require updating those files using MKVToolNix (or something similar) - faster than re-ripping them, but still time. Again, not sure on mp4 files or other formats and I’m not sure what you mean about showing subtitles instead of chapters.

Sorry, I just don’t believe there is a way that Plex can “turn off” chapter navigation if it is built into the files.

You are using mp4 files, right?
Because in mp4 files, chapter markers are stored very similar to subtitles.
That’s why they may appear as a subtitle in the client.
However that is still a bug in the server.

So there is nothing to do for you to remove them - except to report this behaviour as a bug.
Which you just did.

Now, if you had a sample file which exhibits the behaviour, it’d be great.
Even better if this sample file would be as small as possible.

Yes. I create mkv files first, then compress using HandBrake. I found if I redo the file in HandBrake, the subtitles are displayed again. I don’t know if it’s a Sub-Zero thing or a bug. Regardless, I have had so many issues with Plex that I decided to scrap it and I’ve put all my movies in Kodi. I was shocked how much easier it is to set it up - locate the \movies and \TV Shows folders, Kodi loads them and bang, I’m done, other than checking to make sure I named files correctly. No worrying about losing the server for no reason (it worked the night before. Then next morning it “loses” it again.) Restart a few times and it comes back. Plex admittedly isn’t as fussy as Kodi for file naming, but small price to pay for the peace of mind knowing it will work the next time I turn on my device. I also get my subtitles. Thanks so much for responding.

As I mentioned, I am no longer going to be using Plex. Just too many issues that kept occurring and I was spending more time troubleshooting than actually being able to relax and enjoy my movies. I admit, it could be my Nvidia Shield that created some of the issues, but I can’t believe all were related to hardware.

Regarding “showing chapters rather than subtitles,” where the subtitle would normally display (I have it set to display at the bottom), the chapter marker would display instead (e.g. “chapter 1”). Redoing it in HandBrake and making sure I unchecked “create chapter markers” fixed it, but tedious fix. Thanks for the info and the help.

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