Pictures and layers included in a VVC image item

An apparatus for processing visual media file data comprising a processor and a non-transitory memory with instructions thereon, wherein the instructions upon execution by the processor, cause the processor to:

• perform a conversion between a visual media file and a bitstream, wherein the visual media file comprises a sequence of one or more pictures according to a media file format, and wherein the bitstream comprises one or more access units according to a video coding format,
• wherein the bitstream is coded according to the video coding format,
• wherein the media file format specifies that an image item of a specific type value in the visual media file includes a single access unit, wherein the single access unit is allowed to be one of a single Intra Random Access Picture (IRAP) access unit according to the video coding format and a single Gradual Decoding Refresh (GDR) access unit according to the video coding format, and wherein all pictures in the GDR access unit are identified as a recovery point in the bitstream;
• wherein the media file format specifies that an image item of a specific type value in the visual media file excludes layers that do not belong to a target output layer set;
• and
• wherein the media file format further specifies that, in response to a record of operating points being included in a property descriptor of the operating points that indicates high-level characteristics of the bitstream, a value of a first syntax element ptl_max_temporal_id in the record and a value of a second syntax element max_temporal_id in the record are constrained to be equal to zero, wherein the first syntax element indicates a maximum temporal identification of layer representation for a specified profile, tier, and level structure, and wherein the second syntax element indicates a maximum temporal identification for an operating point.

A non-transitory computer-readable storage medium storing instructions that cause a processor to:

• perform a conversion between a visual media file and a bitstream, wherein the visual media file comprises a sequence of one or more pictures according to a media file format, and wherein the bitstream comprises one or more access units according to a video coding format,
• wherein the bitstream is coded according to the video coding format,
• wherein the media file format specifies that an image item of a specific type value in the visual media file includes a single access unit, wherein the single access unit is allowed to be one of a single Intra Random Access Picture (IRAP) access unit according to the video coding format and a single Gradual Decoding Refresh (GDR) access unit according to the video coding format, and wherein all pictures in the GDR access unit are identified as a recovery point in the bitstream;
• wherein the media file format specifies that an image item of a specific type value in the visual media file excludes layers that do not belong to a target output layer set;
• and
• wherein the media file format further specifies that, in response to a record of operating points being included in a property descriptor of the operating points that indicates high-level characteristics of the bitstream, a value of a first syntax element ptl_max_temporal_id in the record and a value of a second syntax element max_temporal_id in the record are constrained to be equal to zero, wherein the first syntax element indicates a maximum temporal identification of layer representation for a specified profile, tier, and level structure, and wherein the second syntax element indicates a maximum temporal identification for an operating point.

A non-transitory computer-readable recording medium storing a bitstream of a video which is generated by a method performed by a video processing apparatus, wherein the method comprises:

• generating a visual media file from the bitstream of the video,
• wherein the visual media file comprises a sequence of one or more pictures according to a media file format, and wherein the bitstream comprises one or more access units according to a video coding format,
• wherein the bitstream is coded according to the video coding format,
• wherein the media file format specifies that an image item of a specific type value in the visual media file includes a single access unit, wherein the single access unit is allowed to be one of a single Intra Random Access Picture (IRAP) access unit according to the video coding format and a single Gradual Decoding Refresh (GDR) access unit according to the video coding format, and wherein all pictures in the GDR access unit are identified as a recovery point in the bitstream;
• wherein the media file format specifies that an image item of a specific type value in the visual media file excludes layers that do not belong to a target output layer set;
• and
• wherein the media file format further specifies that, in response to a record of operating points being included in a property descriptor of the operating points that indicates high-level characteristics of the bitstream, a value of a first syntax element ptl_max_temporal_id in the record and a value of a second syntax element max_temporal_id in the record are constrained to be equal to zero, wherein the first syntax element indicates a maximum temporal identification of layer representation for a specified profile, tier, and level structure, and wherein the second syntax element indicates a maximum temporal identification for an operating point.