==== HEVC_video_descriptor

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

[source,xml]
----
<HEVC_video_descriptor
    profile_space="uint2, required"
    tier_flag="bool, required"
    profile_idc="uint5, required"
    profile_compatibility_indication="uint32, required"
    progressive_source_flag="bool, required"
    interlaced_source_flag="bool, required"
    non_packed_constraint_flag="bool, required"
    frame_only_constraint_flag="bool, required"
    copied_44bits="uint44, default=0"
    reserved_zero_44bits="uint44, default=0"
    level_idc="uint8, required"
    HEVC_still_present_flag="bool, required"
    HEVC_24hr_picture_present_flag="bool, required"
    sub_pic_hrd_params_not_present="bool, default=true"
    HDR_WCG_idc="uint2, default=3"
    temporal_id_min="uint3, optional, specify both min and max or none"
    temporal_id_max="uint3, optional, specify both min and max or none"/>
----

Note: The attributes `reserved_zero_44bits` and `copied_44bits` are identical.
The former is the original name in amendment 3 of <<ISO-13818-1>> and
the latter is the new name when the amendment was integrated in <<ISO-13818-1>>.
Both attributes are optional but only one shall be specified.
