JVET-AL0308 AHG9: On layer ID syntax elements in VSEI TuC [J. Xu, Y.-K. Wang (Bytedance)] [late]

This contribution proposes to change the coding method and specify the range for various syntax elements representing layer ID in the VSEI TuC document, including cr_layer_id and cr_vui_layer_id in the constituent rectangles SEI message, doi_nuh_layer_id and doi_alpha_nuh_layer_id in the display overlays information SEI message, bri_nuh_layer_id in the bitdepth range information SEI message and ecfi_vui_layer_id and ecfi_layer_id in the enhanced colour format information SEI message.

It was suggested to add a note VSEI TuC that the layer ID values may be further restricted by the referring video coding spec.

It was also suggested that the ue(v) limit be specified in the interface.

Other syntax elements such as bit depth, quantization parameter, etc., may have similar issues, and we may wish to have a consistent approach.

Decision: Adopt to TuC, with addition of a note as described above.

Further study if we want to specify a large range in VSEI or state that the range is specified by the referring spec, and if the approach can be applied to SEI messages in VSEI v4 and for additional parameters.

Display rectangles SEI (4)

Contributions in this area were discussed during 1540–1650 on Wednesday 2 April 2025 (chaired by J. Boyce).