JVET-S0192 AHG9: On reference picture list with generating unavailable reference picture [B. Choi, S. Wenger, S. Liu (Tencent)]
Aspect 1 of this contribution belongs to this category.
JVET-S0192 AHG9: On reference picture list with generating unavailable reference picture [B. Choi, S. Wenger, S. Liu (Tencent)]
Aspects 2 and 3 of this contribution belong to this category.
Aspect 2: Modify the following sentence to clarify the intention,
“For each LTRP entry in RefPicList[ 0 ] or RefPicList[ 1 ], when the picture is an STRP with the same nuh_layer_id as the current picture, the picture is marked as "used for long-term reference".”
as
“For each LTRP entry in RefPicList[ 0 ] or RefPicList[ 1 ], when the picture is currently marked as "used for short-term reference" with the same nuh_layer_id as the current picture, the picture is marked as "used for long-term reference".”
It was commented that a change for aspect 2 is not strictly necessary, because an STRP is a picture that is marked as used for ST reference and an LTRP is a picture that is marked as used for LT reference. However, the first suggested rephrasing may be an improvement of editorial clarity. The second suggested rephrasing is not correct.
Editor action item: The first rephrasing proposed for aspect 2 is suggested to be considered by the editor.
Aspect 3: Add the following note to the decoding process for reference picture list construction, to inform that the bitstream conformance check of the reference picture list should be performed after generating unavailable pictures.
“NOTE 5 – When the bitstream conformance is checked with the following constraints, the conformance check should be done after invoking decoding process for generating unavailable reference pictures specified in 8.3.4.”
Editor action item: The editor is suggested to add such a NOTE, but using “is to be” rather than “should be”.