`DisplayUnit` lost during remuxing
it seems that
DisplayUnit gets lost during remuxing, e.g. if
DisplayWidth is 16,
DisplayHeight is 9 and
DisplayUnit is 3, then the remuxed file would indicate that it should be scaled to 16 pixels x 9 pixels (and mkvalidator outputs the following warning:
WRN0E3: The output pixels for Video track #1 seem wrong 16x9px from 720x576).