when one remuxes an input file with a video track with some of the colour attributes set and with the
no_cue_duration switches set, the output file has
DocTypeVersion set to two, although the new elements are v4 only.
When one adds one of these new colour elements in the header editor to a file with
DocTypeVersion set to two, the header editor doesn't change the
DocTypeReadVersion making the resulting file specs incompliant.