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Creating byte identical files
That being said, 0xbf is not a valid Matroska element ID according to the current Matroska specs (there would have to be an XML element with an id="0xbf" attribute in the linked specs file).
For general parsing of the tag/length/value format & the variable-length thingies, see the EBML specification. Refer to the Matroska specification I've linked to above for which element IDs are actually assigned and what their meaning is.
There are a lot of references on github, too, for example https://github.com/vi/zigmkv/blob/5fc920c04ce46df0dff0b054631d8203beab0e2d/src/mkv/database.py
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