So I added the movie and subtitles into multiplexing, and after it finished, the movie was instead of 2 hours, 19 hours. When i skip to example 18 hours in the movie it just goes back to 0 minutes.
Welcome!
The issue is that at least one of the subtitle entries has either a really huge start timestamp or a really huge duration. The resulting file’s duration is the difference between highest timestamp of all frames + its corresponding duration minus lowest timestamp of all frames.
Just edit your subtitles, find the offending entry or entries & fix them before multiplexing them with the source file.
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