Abstract: A mechanism for processing media data is disclosed. In one aspect, a method includes determining, during a conversion between the media data and a media data file, whether a track reference of type associated external stream track (‘aest’) is included in a media track. The method also includes performing the conversion based on the determining. Additionally, when present, a track reference type box with a reference type equal to ‘aest’ shall contain only a track identifier and shall not contain any track group identifier.

Abstract: A mechanism for processing video data is provided. A value of an extended dependent random-access point (EDRAP) leading pictures decodable flag (edrap_leading_pictures_decodable_flag) syntax element is determined. A conversion can then be performed between a visual media data and a bitstream based on the edrap_leading_pictures_decodable_flag syntax element. The value of the edrap_leading_pictures_decodable_flag indicates whether ordering constraints are imposed on the EDRAP picture.

Abstract: A mechanism for processing video data is disclosed. A type for a value taken by a region identifier (ID) in a region identifier (ID) type field (region_id_type) is determined. The type for the value taken by the region ID is coded in the region ID type field using four or less bits. A conversion between the visual media data and a media data file is performed based on the type for the value taken by the region ID in the region ID type field.

Abstract: A video coding mechanism is disclosed. The mechanism includes receiving a bitstream comprising a first header parameter set (HPS) containing a first type of coding tool parameters, a second HPS containing a second type of coding tool parameters, a slice header, and a slice associated with the slice header. The mechanism further includes determining that the slice header contains a first reference to the first HPS and a second reference to the second HPS. The mechanism further includes decoding the slice using the first type of coding tool parameters and the second type of coding tool parameters based on the determination that the slice header contains the first reference and the second reference. The mechanism further includes forwarding the slice for display as part of a decoded video sequence.

Abstract: A method of processing video data includes using a scalability dimension information (SDI) supplemental enhancement information (SEI) message to indicate which primary layers are associated with an auxiliary layer when auxiliary information is present in a bitstream, and converting between a video media file and the bitstream based on the SDI SEI message. A corresponding video coding apparatus and non-transitory computer readable medium are also disclosed.

Abstract: A mechanism for processing video data is disclosed. The mechanism includes determining one or more bytes of data from a supplemental enhancement information (SEI) raw byte sequence payload (RBSP) header, wherein the SEI RBSP header is included in an SEI RBSP before one or more SEI messages carried in the SEI RBSP. A conversion is performed between a visual media data and a bitstream based on the SEI RBSP header.

Abstract: Examples of video encoding methods and apparatus and video decoding methods and apparatus are described. An example method of video processing includes performing a conversion between a video and a bitstream of the video comprising one or more output layer sets according to a rule, wherein the rule specifies that a supplemental enhancement information (SEI) network abstraction layer (NAL) unit that includes a scalable-nested SEI message carrying picture timing information is not included due to use of a same picture timing in all output layer sets in the bitstream.

Abstract: A video coding mechanism is disclosed. The mechanism includes receiving a bitstream comprising a plurality of coded sequences of point cloud coding (PCC) frames, wherein the plurality of coded sequences of PCC frames represent a plurality of PCC attributes including geometry, texture, and one or more of reflectance, transparency, and normal. Each coded PCC frame is represented by one or more PCC network abstraction layer (NAL) units. The mechanism also includes parsing the bitstream to obtain an indication for each of the PCC NAL units that indicates whether each of the PCC NAL units belongs to a corresponding one of the PCC attributes, and to which of the PCC attributes the PCC NAL unit belongs when the PCC NAL unit belongs to the corresponding PCC attribute. The mechanism also includes decoding the bitstream based on the indications.

Abstract: A mechanism for processing video data is disclosed. The mechanism determines for a supplemental enhancement information (SEI) processing order SEI message that SEI prefix indications, when present, are signaled in units of bits, where an SEI prefix indication for a particular SEI payloadType is a bit string that follows an SEI payload syntax of that value of payloadType and contains a number of complete syntax elements starting from a first syntax element in an SEI payload. A conversion is performed between a visual media data and a bitstream based on the SEI processing order SEI message.

Abstract: A mechanism for processing video data is disclosed. The mechanism includes determining that, except for one or more special cascading cases, any processing chain containing multiple supplemental enhancement information (SEI) message types is indicated by an SEI processing order (SPO) SEI message having a particular value of a processin order identifier syntax element. A conversion is performed between a visual media data and a bitstream based on the SPO SEI message.

Abstract: A mechanism for processing video data is disclosed. The mechanism includes determining to apply a chosen processing chain to a picture, wherein the chosen processing chain includes applying one or more post-processing filters (PPFs) to the picture. The PPFs may include neural-network post-filters (NNPFs). A conversion is performed between a visual media data and a bitstream based on the PPFs.

Abstract: A mechanism for processing video data is disclosed herein. The mechanism includes determining to apply a multiview extended ten-bit (Multiview Extended 10) profile to a visual media data. A conversion can then be performed between a visual media data and a bitstream based on the Multiview Extended 10 profile. Various constraints can also be applied to bitstreams conforming to the Multiview Extended 10 profile or layers thereof.

Abstract: A mechanism for processing video data is disclosed. The mechanism includes determining an identifying number or a syntax element named po_id is signalled in the SEI processing order SEI message to identify a group of SEI message types for which the preferred order of processing is indicated in the SEI processing order SEI message. A conversion is performed between a visual media data and a bitstream based on the syntax element.

Abstract: A mechanism for processing video data is disclosed. The mechanism includes determining to obtain a list of output pictures from a processing chain, wherein the list of output pictures can include more pictures than are output by a last post-processing filter (PPF) in the processing chain. The PPFs may be neural-network post-filter (NNPFs). A conversion is performed between a visual media data and a bitstream based on the processing chain.

Abstract: Embodiments of the present disclosure provide a solution for visual data processing. A method for visual data processing is proposed. The method comprises: determining whether a first coding mode is enabled for a conversion between visual data and a bitstream of the visual data with a neural network (NN)-based model, the visual data being at least a part of a picture of a video or an image; and performing the conversion based on the determining, wherein in the first coding mode, a set of residual samples associated with the visual data is partitioned into a plurality of subsets of residual samples, and a subset of residual samples among the plurality of subsets of residual samples is coded before a further subset of residual samples among the plurality of subsets of residual samples.

Abstract: A mechanism for processing video data is disclosed. The mechanism includes determining to apply a processing chain of post-processing filters (PPFs) to visual media data by: obtaining a list of cropped decoded pictures in output order, choosing the processing chain, applying each PPF in the processing chain to each cropped decoded picture in the list, and replacing cropped decoded pictures in the list with processed pictures. A conversion is performed between a visual media data and a bitstream based on the processing chain.

Abstract: A mechanism for processing one or more video data is disclosed herein. The mechanism includes determining to apply a multiview monochrome sixteen-bit (Multiview Monochrome 16) profile to a visual media data. A conversion can then be performed between a visual media data and a bitstream based on the Multiview Monochrome 16 profile.

Abstract: A mechanism for processing video data is disclosed. The mechanism determining that a current layer in a sub-bitstream (subBitstream) conforms to a multiview format range extension profile, wherein all active sequence parameter sets (SPSs) for the current layer and a reference layer of the current layer shall include a chroma format identification code (chroma_format_idc) equal to 0 only. A conversion is performed between a visual media data and a bitstream based on the multiview format range extension profile.

Abstract: A mechanism for processing video data is disclosed. The mechanism includes determining multiple neural-network post-processing filters (NNPFs) or neural-network post-processing filter groups (NNPFGs) defined in one or more supplemental enhancement information (SEI) messages share a same NNPF purpose. A conversion is performed between visual media data and a bitstream based on the determining.

Abstract: Embodiments of the present disclosure provide a solution for point cloud coding. A method for point cloud coding is proposed. The method comprises: performing a conversion between a current point cloud frame of a point cloud sequence and a bitstream of the point cloud sequence, a first slice in the current point cloud frame being directly depended upon by no more than a single dependent slice.