MediaInfoLib VS PlexSubtitleExtractor

can you use https://mediaarea.net/MediaInfo and post the text output. maybe there is something malformed in the source that the render engine is unhappy with. as soon as i see sync issues that dont make any sense, i always blame the source media and look to reencode it or somehow repackage it (like with handbrake) into a known and not wierdo format. remember mp4 is just a box. there might be a cat in that box, there might not be a cat at all.

Footage specs - MediaInfo - please include the "Text" view of the file.

Is the problem with absolutely every AVC (h264) video you've tried, or only some? If it works with some and not others, can you share a MediaInfo report on a sample "faulty" file?

Need a little more info. What's the audio codec? Try converting the audio to AAC. Use mediainfo to see what codecs the file have.

Can you give the MediaInfo report from one of the files that Jellyfin is having a "hard time" with?

Some can be encoded with 8bit others with 10bit, the device maybe doesn't play well with 10bit encoded videos. You can use mediainfo to see if was encoded with 8bit or 10bit.

What are the specifications of the file? Run MediaInfo on it and post the results here.

Use MediaInfo on it and post the results.

Footage specs - MediaInfo - please include the "Text" view of the file.

I linked the support article in my first reply: Adding Local Subtitles to Your Media, along with a couple sites you can use to search for those subtitles. If you're familiar with running Python scripts, you could also try running this, which should extract any subtitles you've recently downloaded via Plex's search to a folder that you can then copy alongside the file it belongs to.

They're stored in the Plex blob database as compressed text, and not editable directly. I wrote this script awhile ago that can dump all subtitles it finds into a directory of your choice, which you could then edit and place next to your media as an additional subtitle track. It's a very basic script without many options, but if you're familiar with Python you could probably expand on it to save the subtitles next to the media automatically, or even re-gzip them and overwrite the entries in the database.

I just created this script, which in theory will dump all subtitles that are stored in the Plex database (named inline with the files they're associated with). It admittedly hasn't been heavily tested, but it worked for my server.