Question about mandatory entries

Dan Hinsley via Matroska-users <[email protected]> Sun, 13 Mar 2016 16:06:11 -0700
Newsgroups gmane.comp.multimedia.matroska.user
Message-ID <[email protected]>
So if I look at the specifications at https://matroska.org/technical/specs/index.html, there are elements that are mandatory, that don't seem to be in most mkv files, and that mkvalidator doesn't call out.  

For example, FlagEnabled, FlagForced and TrackTimecodeScale in the TrackEntry element.  Are these really mandatory, and if not is there a better spec that says which elements are really mandatory?

Dan

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