id summary reporter owner description type status priority milestone component version resolution keywords cc 903 Issues in Subpicture sub-bitstream extraction process vdrugeon "In C.7 Subpicture sub-bitstream extraction process, the variable SubpicIdList is used, but never defined. At first, I thought that the variable SubpicIdVal was meant instead, but this is unlikely, since SubpicIdVal converts a subpicture index into a subpicture ID, whereas the variable SubpicIdList seems to convert a subpicture ID into a subpicture index, which is the opposite. So I believe that SubpicIdList derivation is needed and currently missing. Furthermore, the process contains the following: ""Rewrite the value of the pic_width_max_in_luma_samples and pic_height_max_in_luma_samples in all referred to SPS NAL units and the value of pic_width_in_luma_samples and pic_height_in_luma_samples in all referred to PPS NAL units to be equal to subpic_width_minus1[ SubpicIdList[ subPicId ] ] and subpic_height_minus1[ SubpicIdList[ subPicId ] ]."" This seems wrong, because subpic_width_minus1 and subpic_height_minus1 are in units of CtbSizeY, whereas pic_width_max_in_luma_samples and pic_height_max_in_luma_samples are in units of luma samples. " defect closed minor spec fixed ksuehring bbross XiangLi fbossen jvet@…