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17th Meeting: Brussels, January 2020 2020-01-15 11:37
AHG9: On Video Usability Information
Authors: Virginie Drugeon Panasonic
Abstract
The VUI syntax structure contains essential information for proper display of the video. The current specification text contains several comments on the VUI syntax and semantics. Suggested fixes for three of these comments are proposed in the present document. Specifically, it is proposed to
Meeting Notes
JVET-Q0042 AHG9: On Video Usability Information [V. Drugeon (Panasonic)]

This contribution was discussed Sunday 12 January at 1445 in Track A (chaired by GJS).

The VUI syntax structure contains essential information for proper display of the video. The current specification text contains several comments on the VUI syntax and semantics. Suggested fixes for three of these comments are proposed in the present document. Specifically, it is proposed to

  1. Move the overscan information to immediately follow the aspect ratio information;
  2. Infer that the chroma sample location type is unspecified when not present;
  3. Use the two flags general_progressive_source_flag and general_interlaced_source_flag as condition to switch between signalling of chroma_sample_loc_type_frame and chroma_sample_loc_type_top_field/‌chroma_sample_loc_type_bottom_field.

It was commented that there are a couple of issues:

  • The general_progressive_source_flag and general_interlaced_source_flag are in the PTL syntax structure, so it was agreed not to move these and to refer to externally specified values for these in the SEI spec.
  • The VVC spec should not refer to a value in the SEI spec. In the semantics of the frame-field information SEI message (which is in the VVC spec), there is a constraint on source scan type that refers to the two flags proposed to be moved to VUI. Such a constraint can just be rephrased to be imposed the other way around.

Decision (cleanup): Adopt (all three aspects, with modifications as described above.

It was commented that a small change should allow moving the frame-field information SEI message to the SEI spec. Offline study was coordinated by Ye-Kui Wang for that. See the notes for JVET-Q0818.

Cited:
JVET-Q0397 JVET-Q2007 JVET-R0090 JVET-R2007 JVET-S0172 JVET-S2007
PATENTS:
4093035 1.00 4093036 1.00 4109907 1.00 20180199412 1.00 20220256198 1.00 20230308690 1.00 20240223815 1.00 4637274 0.34
ARCHIVE v2 :
JVET-Q0042.docx JVET_Q0042_after_discussion_based_on_JVET-P2007-v3.docx
Decisions
It was commented that a small change should allow moving the frame-field information SEI message to the SEI spec. Offline study was coordinated by Ye-Kui Wang for that. See the notes for JVET-Q0818.
Citation