VUI parameters absent from hummingbird_spatial.265

Hi @ziawa, here is a bug from the test sample hummingbird_spatial.265.

The VUI parameters is absent

vui_parameters_present_flag = 0

Contradictory to the VUI constraint of the MV-HEVC-Main Stereo constraint:

vui_parameters_present_flag shall be set to 1.

Also note that there are quite some constraints on the VUI:

In the VUI,

• the aspect ratio information is present, i.e. the aspect_ratio_info_present_flag value shall be set to 1,
• the colour parameter information is present, i.e. video_signal_type_present_flag value shall be set to 1 and the colour_description_present_flag value shall be set to 1.
• only video range signals are used, i.e. the video_full_range_flag shall be set to 0,
• no overscan signalling is present, i.e. the overscan_info_present_flag shall be set to 0,
• the chroma location shall be signalled, i.e. chroma_loc_info_present_flag shall be set to 1,
• the timing information may be present. If the timing information is present, i.e. the value of vui_timing_info_present_flag is set to 1, then the values of vui_num_units_in_tick and vui_time_scale shall be set according to the frame rates allowed for each operation point. The timing information present in the video Bitstream should be consistent with the timing information signalled at the system level. The frame rate shall not change between two RAPs. fixed_frame_rate_flag value, if present, shall be set to 1.