==== EVC_timing_and_HRD_descriptor

Defined by MPEG in <<ISO-13818-1>>.

[source,xml]
----
<EVC_timing_and_HRD_descriptor
    hrd_management_valid="bool, required"
    N="uint32, optional"
    K="uint32, optional"
    num_units_in_tick="uint32, optional"/>
----
