Abstract: A method of decoding implemented by a video decoder is provided. The method includes receiving a bitstream including a coded video sequence start (CVSS) access unit (AU), wherein the CVSS AU contains a picture unit (PU) for each layer, and wherein a coded picture in each PU is a coded layer video sequence start (CLVSS) picture; identifying the coded picture from one of the layers based on a picture order count (POC) value; and decoding the coded picture to obtain a decoded picture.

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, wherein the bitstream includes one or more output layer sets comprising one or more video layers according to a format rule, wherein the format rule specifies that a non-scalable-nested supplemental enhancement information, SEI, message that includes information regarding hypothetical reference decoder, HRD, is applicable to all output layer sets that include same video layers as the bitstream.

Abstract: A method implemented in an encoder for encoding a video bitstream that includes coded data for a plurality of pictures, each of the plurality of pictures comprises at least one slice. The method includes encoding a flag that indicates whether tile information for a picture is present in a picture parameter set or present in a slice header, where the tile information indicates a location of a slice within the picture; encoding the tile information in only the picture parameter set when the flag indicates that the tile information for the picture is encoded in the picture parameter set; encoding the tile information in only the slice header when the flag indicates that the tile information for the picture is encoded in the slice header; and encoding data of the picture in the video bitstream based on the tile information.

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 sample of a point cloud sequence and a bitstream of the point cloud sequence, wherein during the conversion at least one of the following data units comprises an integer number of bytes: a first data unit indicating an end of a point cloud frame associated with the current point cloud sample, a second data unit comprising attribute values for a single attribute in the current point cloud sample, or a third data unit specifying a single attribute value for all points in the current point cloud sample. Thereby, the proposed method can advantageously better support the encapsulation of data units in the type-length-value (TLV) bytestream format.

Abstract: Embodiments of the present disclosure provide a solution for video processing. A method for video processing is proposed. The method comprises: receiving, at a first device, a metadata file from a second device; and determining a descriptor in a data set in the metadata file, a presence of the descriptor indicating that a representation in the data set is a main stream representation (MSR).

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 point cloud frame of a point cloud sequence and a bitstream of the point cloud sequence, a tile in the point cloud frame comprising a set of slices, a bounding box of the tile comprising at least a part of points in the set of slices, the at least a part of the points being obtainable from the set of slices.

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 point cloud sequence and a bitstream of the point cloud sequence based on a set of syntax elements comprising at least one of the following: a first syntax element identifying a first point cloud frame, a frame-specific attribute property being applied to the first point cloud frame, and the set of bits are indicated in the bitstream, or a second syntax element identifying a second point cloud frame, a frame boundary marker being applied to the second point cloud frame, wherein the length in bits of the second syntax element is greater than or equal to the number of bits in the set of bits.

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.

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 point cloud sequence and a bitstream of the point cloud sequence based on a tile inventory, the tile inventory being valid starting from a first coded point cloud frame in the bitstream, the first coded point cloud frame immediately following a data unit for the tile inventory in a bitstream order, or the first coded point cloud frame following the data unit in the bitstream order and having a frame counter partially indicated in the data unit. Thereby, the proposed method can advantageously better support the application of the tile inventory.

Abstract: A method of coding implemented by a video encoder. The method includes encoding a representation of video data into a bitstream, the bitstream being prohibited from including a fisheye supplemental enhancement information (SEI) message and one of a projection indication SEI message and a frame packing indication SEI message that both apply to any particular coded picture in the bitstream; and transmitting the bitstream to the video decoder.

Abstract: A video coding mechanism is disclosed. The mechanism includes encoding a bitstream comprising one or more layers. A scalable nesting supplemental enhancement information (SEI) message is encoded into the bitstream in a current SEI network abstraction layer (NAL) unit. The scalable nesting SEI message contains one or more scalable-nested SEI messages and one or more scalable nesting layer identifiers (Ids) that specify layer Id values of the layers to which the scalable-nested SEI messages apply except a layer Id value of the current SEI NAL unit. A set of bitstream conformance tests are performed on the layers based on the scalable-nested SEI messages. The bitstream is stored for communication toward a decoder.

Abstract: A video coding mechanism is disclosed. The mechanism includes receiving a bitstream including image data divided into one or more slices. The one or more slices are further divided into one or more tiles. The mechanism further includes determining that a first slice contains a single tile based on a first flag. The mechanism further includes decoding the first slice to generate a reconstructed image.

Abstract: A mechanism for processing video data is disclosed. A level indicator for a set of subpictures in one or more subpicture tracks is determined. The level indicator is included in a sample group carrying information for the set of subpictures. A conversion is performed between a visual media data and a media data file based on the level indicator.

Abstract: Embodiments of the present disclosure provide a solution for media processing. A method for media processing is proposed. The method comprises: performing a conversion between a media file of a media and a media presentation of the media, wherein each media sample in an external stream representation (ESR) in the media presentation corresponds to a media sample in a main stream representation (MSR) in the media presentation, a presentation time of the media sample in the ESR being the same as a presentation time of the corresponding media sample in the MSR. Thereby, the proposed method can advantageously support the extended dependent random access point (EDRAP)-based technology more efficiently.

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 current picture of a video and a bitstream of the video according to a rule. The rule specifies that a number of entries in a reference picture list of the current picture is greater than 0 in response to (1) one or more slices in the current picture being allowed to have a slice type other than an Intra (I) slice type, and (2) reference picture list (RPL) information being present in a picture header.

Abstract: A video coding mechanism is disclosed. The mechanism includes receiving a bitstream comprising a gradual decoding refresh (GDR) picture, a recovery point picture following the GDR picture in decoding order, and a header associated with the GDR picture. The header includes a picture order count (POC) least significant bit (LSB) value coded prior to a recovery POC value. A POC for the GDR picture is determined based on the POC LSB value. The recovery POC value is determined based on the POC for the GDR picture. The recovery POC value indicates a POC for the recovery point picture. The bitstream is decoded according to GDR based on the GDR picture and the recovery point picture.

Abstract: A method includes performing a conversion between a video unit of a video and a bitstream of the video. The bitstream conforms to a format rule. The format rule specifies that a syntax element indicating whether an in-loop filtering operation is performed across slice boundaries is selectively included in the bitstream based on whether or how the video unit is partitioned into slices.

Abstract: A video coding mechanism is disclosed. The mechanism includes encoding a bitstream comprising one or more output layer sets (OLSs). A video parameter set (VPS) specifying the OLS is also encoded into the bitstream. A set of bitstream conformance tests are performed at each operation point (OP) of each OLS, as specified by the VPS, to test each OP for conformance. The bitstream is stored for communication toward a decoder.

Abstract: Embodiments of the present disclosure provide a solution for media data transmission. A method for media data transmission is proposed. The method comprises: transmitting, at a first device and to a second device, a request for at least one media data file, the request comprising a first indication indicating that a plurality of media data files are to be transmitted in a single message; and receiving the plurality of media data files in the single message from the second device. Thereby, the initialization delay can be advantageously reduced.

Abstract: A magnetic field enhancing component, including: a first dielectric layer comprising a first surface and a second surface opposite to each other; a first electrode layer arranged on the first surface; a second electrode layer and a fourth electrode layer, which are arranged on the second surface at an interval, where orthographic projections of the first electrode layer and the second electrode layer, which are projected onto the first dielectric layer, overlap each other, and orthographic projections of the first electrode layer and the fourth electrode layer, which are projected onto the first dielectric layer, overlap each other; and a first external capacitor, a second external capacitor, and a first switching control circuit. One terminal of the second external capacitor is connected to the second electrode layer, and another terminal of the second external capacitor is connected to one terminal of the first external capacitor and one terminal of the first switching control circuit, respectively.