Using mkvmerge to Merge Subtitle Tracks

I am looking for a way to merge two MKV files, each with an embedded subtitle track, into one where the subtitle tracks merge properly and in order. Right now I get two separate subtitle tracks, and not one single one. I do NOT want to hardcode. I can extract the SRT files from both, but have no idea how to merge them together properly. I am on a mac running macOS Catalina, but have some terminal experience.

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Disclaimer: I am assuming both videos have the same video resolution, video codec, audio codec, video framerate, and have the same amount of tracks (1 video, 1 audio, 1 srt subtitle). You will need to provide further details about these two videos you are joining. If they are not exactly the same in terms of that jargon I just mentioned, then this easy method won't work and you will need a more involved and harder process.

Instructions: Use MKVToolNix, a mac version is available and free, these instructions are for windows so take it with a grain of Mac salt and Windows-to-Mac translation.

  1. Drag the 1st video into the Source files: area
  2. Drag the 2nd video into the same area
  3. A window will pop-up asking how you want to treat the 2nd video, select Append to an existing source file this joins the file, select OK
  4. At the bottom there is a destination directory, choose where you want to save the file
  5. At the very bottom click the Start Multiplexing button
  6. Done!
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