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Nice one, good advice, also as a quick look up to see which language tracks, commentary tracks or subs the file has I recommend this --> MediaInfo.

A very quick brief of how to use the Mkvtoolnix for those that are unsure, download Mkvtoolnix, then download gMKVExtractGUI, once both are installed open MKV Extract and navigate to the MKV you'd like removed tracks, once the file is selected just tick the boxes of the files you'd like to keep/extract, then extract the to a folder.

Now open MKV JOIN, navigate to the extract folder and select all the files then hit "Start Multiplexing" make a note of the destination file and you're done.

If you run into an error in MKV JOIN, it could be lack of FPS data in the Video file, if that's the case, select the video file at the bottom, then input the correct FPS manually in the box on the right default duration/fps, if you're not sure what the FPS is, use MediaInfo and now we have come full circle. :)

Hope that was helpful to someone. :)

A relative easy way is to use gMKVExtract, drop all videos in and right click select check all subtitles, so it checks all the subs, and you can see what files have subs (are checked) and what doesn't.

Those aren't empty, it's just that they're packed in .MKS (Matroska extension for subs containers)

So, they're no correctly extracted as ass/ssa, srt, etc (the real subs formats).

Use gMKVExtract to (truly) extract those subs/fonts you want, it can batch too, you won't be disappointed ;3.

Extract the merged subtitles using gMKVExtractGUI and see if anything is missing. This will verify if some data got dropped during the merge process. It's possible special or invalid characters are hidden in the file and MKVToolNix is handling them differently than Plex.

Just a wild guess, I've merged plenty of subtitles and never encountered anything like you're describing.

Does another player like VLC show something different?

it depends, subtitles comes in many forms.

• it may be an attached file (.srt) which can directly be opened with a text editor
• it may be in textual form within you file. there are dedicated tools to extract them. it depend of the format of your file, for instance, for MKV, you can use https://sourceforge.net/projects/gmkvextractgui/
• it may be images within your file. It's a bit harder since this not directly text. But there are some tools doing ORC extraction.

Version 2.3? Running 2.5.2 on windows 10..

2.3 came out in 2018

I'm running this version https://sourceforge.net/projects/gmkvextractgui/

ah looks like your running a different version, but that version 2.3 came out in 2016 even..

For the unmoveable cursor, this is the closest I could remember.

1. Find an MKV which have an AVC/H.264 video codec inside, or mux an MP4 with such a video codec to MKV using MKVToolNix.

2. Extract the MKV's video track using gMKVExtractGUI. The extracted extension you must get should be *.avc. MKVcleaver might also do the same. Again, the extracted extension must be *.avc by default by the extractor, not you renaming it.

3. Now play the AVC. There would be a high chance the media player would not be able to display a moveable seekbar or it would be grayed out. I guess it is a phenomenon for the avc container? If so, then one could just remux the MKV or MP4 directly to AVC using for example FFmpeg.

For your second desire, the increasing progress, I don't know, perhaps try playing the *.avc until the ending and check the time elapsed. You may need to wait since the seekbar may be disabled after all.

1. Read this post and the following ones.
2. Don't use MKVExtractGUI2. Use gMKVExtractGUI instead which is actually still maintained.