Subtitles displaying unreliably

Server Version#: 1.13.6.5339 - Windows server 2016
Player Version#: 3.63.1 - Windows 10 - Chrome app

Sometimes subtitles work for a few minutes and then just stop getting rendered on the screen. Sometimes they don’t want to start again after a pause.

Most often I can just hit the 10 sec rewind and they’ll start working fine for a short while.

Please don’t use this. It doesn’t make much sense and is not updated anymore.

Go to https://app.plex.tv/desktop and use this.

Sorry, I did not mean the Chrome app-store app, I meant Chrome as an application.

So, I do open Chrome and hit my bookmark which goes directly to my server 192.168.x.x:32400/web/index.html

That means you are using the ‘local’ web app, which is almost always a bit behind of the ‘hosted’ web app.
Please compare the behaviour of the hosted web app at https://app.plex.tv/desktop

It seems to be less of an issue with the app.plex.tv version, but it still happens.

Could you extract the subtitles from such a video and post it here?

Marvel’s Iron Fist S02E04 1080p Netflix WEB-DL track3_eng.7z (14.4 KB)

Around 19:30-ish is when I had to bump the rewind to get the subs back.
And then somewhere around the 36 minute mark.
Also - Spoilers!

It looks like there is everything in order with the subtitle file.

When this happens, can you determine whether the subtitles get ‘burned in’ by the transcoder or whether they are rendered by the browser on top of the video picture?

You should be able to see this by looking at ‘Now Playing’.
If it says ‘Direct Play’ for the whole file
or ‘Direct Stream’ for the video stream, then it is the browser which loses the subtitles.
If it says ‘transcoding’ then it is the transcoder which loses the subtitles.

It is, in fact, Direct Streaming. The problem occurs in both the Windows 10 App and Chrome browser.

So it is more likely the client, which loses the subtitle.
Could you enable debug logging in both the Plex web app and the Plex server and fetch log files from both a few seconds after it happens to you again?

https://support.plex.tv/articles/200250417-plex-media-server-log-files/

https://support.plex.tv/articles/201611836-plex-web-app-logs/

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