An image decoding method according to the present invention may include splitting a picture into a plurality of tiles; and determining at least one slice on the basis of the plurality of tiles. Here, splitting a picture into a plurality of tiles may include: determining the width of a first tile column in the picture; and determining the width of a second tile column neighboring the first tile column.

A video decoding method performed by a video decoding apparatus, according to the present document, comprises the steps of: parsing a flag for weighted prediction from a bitstream; parsing a prediction weighted table syntax from the bitstream on the basis of the flag; generating prediction samples by performing weighted prediction on a current block within a current picture on the basis of the prediction weighted table syntax; and generating reconstructed samples for the current block on the basis of the prediction samples, wherein the prediction weighted table syntax may be parsed from a picture header or slice header of the bitstream on the basis of a value of the flag.

A video decoding method performed by a video decoding apparatus, according to the present document, comprises the steps of: parsing a flag for weighted prediction from a bitstream; parsing a prediction weighted table syntax from the bitstream on the basis of the flag; generating prediction samples by performing weighted prediction on a current block within a current picture on the basis of the prediction weighted table syntax; and generating reconstructed samples for the current block on the basis of the prediction samples, wherein the prediction weighted table syntax may be parsed from a picture header or slice header of the bitstream on the basis of a value of the flag.

A method of decoding video data by a device is provided. A first flag syntax in a picture parameter set is decoded. The first flag specifies whether tiles within each slice are in raster scan order or the tiles within each slice cover a rectangular region of a picture. The method determines, based on the first flag syntax, whether a slice address syntax is present in a slice header. The slice address syntax is decoded when the slice address is present in the slice header.

According to the document of the present document, information/parameters associated with an entry point can be signaled on the basis of a WPP-associated entry point offset-present flag and a tile-associated entry point offset-present flag, and the effect of increasing coding efficiency, which is the primary purpose of parallel processing in encoding/decoding, can be derived therefrom.

According to the document of the present document, information/parameters associated with an entry point can be signaled on the basis of a WPP-associated entry point offset-present flag and a tile-associated entry point offset-present flag, and the effect of increasing coding efficiency, which is the primary purpose of parallel processing in encoding/decoding, can be derived therefrom.

A method and decoder is provided for decoding at least one current picture from a bitstream. An indicator value is decoded from the bitstream specifying at least one rule of a plurality of rules, the at least one rule applied to ordering of segments coded in the bitstream, wherein the segments are segments in a segment partition layout. A set of syntax elements from the bitstream specifying a segment partition layout is decoded. A segment partition layout based on the set of syntax elements is derived. The at least one current picture in the bitstream is decoded using the segment partition layout, wherein the ordering of the segments complies with the at least one rule specified. An encoder and corresponding method define the segment partition layout, selects the at least one rule from a set of rules, and encodes the segment partition layout and the indicator value into the bitstream.

Methods, systems, apparatuses for video processing are described. A method for processing video includes performing a conversion between a video and a bitstream of the video according to a format rule, and wherein the format rule specifies to include, in a general constraint syntax structure associated with the video, one or more general constraint flags indicating whether corresponding syntax elements are included in a sequence parameter set (SPS) and/or a picture parameter set (PPS) and/or a picture header (PH) and/or a slice header (SH) or to constrain values of the syntax elements in the SPS and/or the PPS and/or the PH and/or the SH.

Methods and apparatus for video processing, including coding and decoding, are described. One example video processing method includes performing a conversion between a video and a bitstream of the video according to a format rule, wherein the bitstream includes one or more output layer sets (OLSs), each OLS comprising one or more coded layer video sequences, and wherein the format rule specifies that a video parameter set indicates, for each of the one or more OLSs, a greatest allowed value of a chroma format indicator and/or a greatest allowed value of a bit depth used to represent pixels of the video.

A method implemented by a video coding apparatus includes applying a neural network (NN) filter to an unfiltered sample of a video unit to generate a filtered sample, where the NN filter is based on a first NN filter model having a first depth, or a second NN filter model having a second depth, where the depth comprises a number of residual blocks of the respective NN filter model, and where the second depth is different than the first depth. The method also includes performing a conversion between a video media file and a bitstream based on the filtered sample.