I am making a 720p copy of The Mummy (1999) Bluray using Handbrake, keeping the original frame rate. The problem starts that Handbrake only detects a handful of the 50 or so subtitle tracks and missed the important forced subtitle track.
Should not be a problem, grab the subtitle track from the original MKV file and mux it into the compressed MKV file with MKVToolNix.
This works as expected except now the subtitles are around 7 seconds out of sync.
Since they are from the exact same source, I would not expect a problem like this. Does anyone have any suggestions where to find the problem?