You can either set the values in pixels (most common), like e.g.:
mkvpropedit "%%I" --edit track:v1 --set display-width=1920 --set display-height=1080
Or less common:
mkvpropedit "%%I" --edit track:v1 --set display-width=16 --set display-height=9 --set display-unit=3
Be careful when working on files without a backup. What exactly has to be done depends highly on the source files - working with anamorphic files is not trivial.
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