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Old 23rd July 2015, 10:38   #3456  |  Link
Mosu
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Join Date: Sep 2002
Location: Braunschweig, Germany
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Both GUIs use the same program (mkvmerge) for the actual work. Re-muxing from Matroska to Matroska works the same in both GUIs, in each case the audio delay is kept.

So if you take the file you're having problems with in the new GUI and re-mux it with the old GUI then you should run into the same sync problems.

See also here for related information.
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