There's quite an important bug in the header editor: When you try to edit a file that was generated with Haali's DS Muxer, both the cli mkvpropedit as well as the GUI in mmg crash with a cpp error:
Assertion failed: CheckMandatory(), file ../../src/EbmlMaster.cpp, line 138
Happens every time, content of the files doesn't matter. Seems the way the 2 programs create their headers is differently.
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