Abstract: A method for controlling bit-width for bi-directional optical flow (BDOF) for video coding includes decoding a first reference picture and a second reference picture, the second reference picture being different than the first reference picture, wherein the first reference picture is displayed before a current picture and the second reference picture is displayed after the current picture. A motion refinement of a coding unit (CU) is calculated by minimizing a difference between a first prediction L0 and a second prediction L1. First gradient values for the first prediction Lo and second gradient values for the second prediction L1 are calculated. A final bi-prediction of the CU is calculated. Also disclosed are an associated apparatus and an associated non-transitory computer readable storage medium.

Abstract: A method for video decoding is provided. The method may be applied in a decoder and includes: receiving a video bitstream comprising a quantization parameter and a quantized level; deriving a scale value by scaling the quantization parameter by a scale factor; determining a plurality of parameters associated with a coding unit (CU); obtaining a plurality of bit-shifts by bit-shifting the plurality of parameters; and obtaining a plurality of coefficients associated with the CU based on the quantized level, the scale value, and the plurality of bit-shifts.

Abstract: A computing device performs a method of decoding video data by reconstructing a luma block corresponding to a chroma block; searching a sub-group of a plurality of reconstructed neighboring luma samples in a predefined order to identify a maximum luma sample and a minimum luma sample; computing a down-sampled maximum luma sample corresponding to the maximum luma sample; computing a down-sampled minimum luma sample corresponding to the minimum luma sample; generating a linear model using the down-sampled maximum luma sample, the down-sampled minimum luma sample, the first reconstructed chroma sample, and the second reconstructed chroma sample; computing down-sampled luma samples from luma samples of the reconstructed luma block, wherein each down-sampled luma sample corresponds to a chroma sample of the chroma block; and predicting chroma samples of the chroma block by applying the liner model to the corresponding down-sampled luma samples.

Abstract: The present disclosure relates to a method for video coding. The method includes obtaining a reference picture in a reference picture list associated with a current coding block; generating an inter prediction based on a motion vector from a current picture to the reference picture; obtaining an intra prediction mode associated with the current coding block; generating an intra prediction of the current coding block based on the intra prediction mode; generating a final prediction of the current coding block by weighted averaging the inter prediction and the intra prediction; and determining whether the current coding block is treated as inter mode or intra mode for most probable mode (MPM) based intra mode prediction.

Abstract: Methods, apparatuses, and non-transitory computer-readable storage mediums are provided for PROF. A decoder obtains first reference picture and second reference picture associated with a video block that is coded by affine mode within a video signal. The decoder obtains first and second horizontal and vertical gradient values based on first prediction samples I(0)(i,j) and second prediction samples I(1)(i,j) associated with the first reference picture and second reference picture. The decoder obtains first and second horizontal and vertical motion refinements based on CPMVs associated with the first reference picture and second reference picture. The decoder obtains first prediction refinement ?I(0)(i,j) and second prediction refinement ?I(1)(i,j) based on the horizontal and vertical gradient values and the first and second horizontal and vertical motion refinements. The decoder obtains final prediction samples of the video block.

Abstract: According to one aspect of the disclosure, a computer-implemented method for performing frame rate up-conversion of video data including a sequence of image frames is provided. The method may include performing, by a video processor, an interpolation quality reliability prediction for a target image level based on a reliability metric. In response to the interpolation quality reliability prediction meeting a first reliability threshold condition associated with a first reliability threshold, the method may include performing, by the video processor, a motion-compensation interpolation at the target image level. In response to the interpolation quality reliability prediction not meeting the first reliability threshold, the method may include performing, by the video processor, a fallback interpolation at the target image level or performing a new interpolation quality reliability prediction for a new image level below the target image level.

Abstract: An electronic apparatus performs a method of decoding video data, comprising: receiving, from bitstream, video data corresponding to a coding unit, wherein the coding unit is encoded in inter prediction mode or intra block copy mode; receiving a first syntax element from the video data, wherein the first syntax element indicates whether the coding unit has any non-zero residuals; in accordance with a determination that the first syntax element has a non-zero value: receiving a second syntax element from the video data, wherein the second syntax element indicates whether the coding unit has been encoded using adaptive color-space transform (ACT); in accordance with a determination that the first syntax element has a zero value: assigning the zero value to the second syntax element; and determining whether or not to perform inverse ACT on the video data of the coding unit in accordance with a value of the second syntax element.

Abstract: A method of subblock-based temporal motion vector prediction is performed at a computing device. The computing device acquires a video bitstream including data associated with multiple encoded pictures. While decoding a current picture in the video bitstream, the computing device selects, according to syntax elements signaled in the video bitstream, one reference picture as a collocated picture of the current picture, and determines a temporal vector between the collocated picture and the current picture from motion information of spatially neighboring blocks of a current code unit (CU) according to a fixed order. Next, the computing device splits the current CU into multiple sub-CUs, obtains a temporal motion vector predictor for each sub-CU from the temporal vector and motion information of a block in the collocated picture that corresponds to a respective subblock of the current picture and decodes the current CU according to the temporal motion vector predictors.

Abstract: A bit-width representation method of prediction refinement with optical flow (PROF), apparatus, and a non-transitory computer-readable storage medium are provided. The method includes obtaining a reference picture I associated with a video block within the video signal, obtaining prediction samples I(i,j) of the video block from a reference block in the reference picture I, controlling internal bit-widths of a PROF derivation process for various representation precisions of internal PROF parameters by applying right-shifting to the internal PROF parameters based on different bit-shift values, obtaining prediction refinement values for samples in the video block based on the PROF derivation process being applied to the video block based on the prediction samples I(i,j), and obtaining prediction samples of the video block based on the combination of the prediction samples and the prediction refinement values.

Abstract: A backup processing method and a server are provided. The method is applied to a backup system, and the backup system includes a plurality of backup servers. The method includes: dividing, by a master backup server in the plurality of backup servers, a backup task into a plurality of child backup tasks; allocating, by the master backup server, each child backup task to each of the plurality of backup servers; and sending, by the master backup server, the plurality of child backup tasks to respective corresponding backup servers. According to this method, a data backup rate can be improved.

Abstract: Methods, apparatuses, and non-transitory computer-readable storage mediums are provided for decoding a video signal. A decoder obtains a first reference picture and a second reference picture associated with a video block. The decoder obtains first and second horizontal and vertical gradient values. The decoder obtains first and second horizontal and vertical motion refinements based on control point motion vectors. The decoder obtains first and second prediction refinements based on the first and second horizontal and vertical gradient values and the first and second horizontal and vertical motion refinements. The decoder obtains first and second refined samples based on the first and second prediction samples, and the first and second prediction refinements. The decoder obtains final prediction samples of the video block based on the first and second refined samples by manipulating the first and second refined samples and prediction parameters to prevent multiplication overflow.

Abstract: An electronic apparatus performs a method of decoding video data. The method comprises, receiving, from bitstream, video data corresponding to a palette-mode coded block; determining a quantization parameter value from information included in a parameter set associated with the palette-mode coded block; identifying escape samples in the palette-mode coded block; in accordance with a determination that the quantization parameter value is greater than a threshold value: performing de-quantization on quantized escape samples according to a predefined formula to obtain reconstructed escape sample values; and in accordance with a determination that the quantization parameter value is less than or equal to the threshold value: setting the reconstructed escape samples to be the quantized escape sample values.

Abstract: A method for controlling bit-width for bi-directional optical flow (BDOF) for video coding includes decoding a first reference picture and a second reference picture, the second reference picture being different than the first reference picture, wherein the first reference picture is displayed before a current picture and the second reference picture is displayed after the current picture. A motion refinement of a coding unit (CU) is calculated by minimizing a difference between a first prediction L0 and a second prediction L1. First gradient values for the first prediction Lo and second gradient values for the second prediction L1 are calculated. A final bi-prediction of the CU is calculated. Also disclosed are an associated apparatus and an associated non-transitory computer readable storage medium.

Abstract: A method for coding video data comprises receiving a video picture comprising a plurality of coding units. The picture is divided into multiple non-overlapped blocks. An encoder calculates a hash value of each block of the multiple non-overlapped blocks. All the non-overlapped blocks are classified into at least two categories comprising a first category and a second category. The first category comprises one or more blocks representing one or more hash values covered by a first set of hash values, and the second category comprises all remaining blocks. The blocks in the second category are classified into at least two groups including a first group. The first group comprises one or more blocks representing the same hash value as another block in the second category. An associated computing device and a non-transitory computer readable storage medium are also provided.

Abstract: A method of decoding video data, comprising: receiving, from bitstream, video data corresponding to a non-skip mode coded block; determining a parameter set associated with the non-skip mode coded block; if the parameter set satisfies a first condition, retrieving a first syntax element from the bitstream; if the parameter set satisfies a second condition, retrieving a second syntax element from the bitstream; if the parameter set satisfies a third condition, retrieving a third syntax element from the bitstream; decoding the video data corresponding to the non-skip mode coded block using palette mode when the first syntax element and the third syntax element have the first value; decoding the video data using intra prediction mode when the first syntax element has the first value and the third syntax element has a second value; and decoding the video data using inter prediction mode when the first syntax element has the second value.

Abstract: An electronic apparatus performs a method of decoding video data. The method comprises: receiving, from bitstream, video data corresponding to a transform-skip mode coded block; decoding, from the video data, a first codeword, a second codeword and a first group of codewords for a pixel within the transform-skip mode coded block; deriving an initial level value from the first group of codewords; converting the first codeword into a remainder of the pixel in accordance with a predefined mapping relationship that is generated using a constant Rice parameter; converting the second codeword into a sign value of the remainder; and deriving a quantified residual of the pixel from the remainder, the sign value and the initial level value.

Abstract: An electronic apparatus performs a method of decoding a video signal. The method comprises: receiving the video signal that includes a first component and a second component in a first picture frame; receiving, from the video signal, a plurality of sample offsets associated with the second component in the first picture frame; deriving a first class index for the second component from a first set of one or more samples of the first component relative to each sample of the second component; selecting a first sample offset from the plurality of sample offsets for the second component according to the first class index; and obtaining a cross-component offsetted sample value of the second component based on the first sample offset in the first picture frame. In some embodiments, the first picture frame is divided into a plurality of regions, and a different classifier is used for each of the plurality of regions.

Abstract: A computing device performs a method of decoding video data by reconstructing a luma block corresponding to a chroma block; searching a sub-group of a plurality of reconstructed neighboring luma samples in a predefined order to identify a maximum luma sample and a minimum luma sample; computing a down-sampled maximum luma sample corresponding to the maximum luma sample; computing a down-sampled minimum luma sample corresponding to the minimum luma sample; generating a linear model using the down-sampled maximum luma sample, the down-sampled minimum luma sample, the first reconstructed chroma sample, and the second reconstructed chroma sample; computing down-sampled luma samples from luma samples of the reconstructed luma block, wherein each down-sampled luma sample corresponds to a chroma sample of the chroma block; and predicting chroma samples of the chroma block by applying the liner model to the corresponding down-sampled luma samples.

Abstract: Methods, apparatuses, and non-transitory computer-readable storage mediums are provided for video decoding. The method includes dividing a video block to multiple non-overlapped video subblocks, dividing a video block to multiple non-overlapped video subblocks, obtaining a first reference picture I(0) and a second reference picture I(1), obtaining first prediction samples I(0)(i,j)'s, obtaining second prediction samples I(1)(i,j)'s, obtaining horizontal and vertical gradient values of the first prediction samples I(0)(i,j)'s and second prediction samples I(1)(i,j)'s, obtaining motion refinements for samples in the video subblock based on the BDOF when the video block is not coded in affine mode, obtaining motion refinements for samples in the video subblock based on the PROF when the video block is coded in affine mode, and obtaining prediction samples of the video block based on the motion refinements.

Abstract: An electronic apparatus performs a method of decoding video data. The method comprises: receiving, from a bitstream, a first control flag that indicates merge mode with motion vector difference (MMVD) is enabled for one or more coding units in a video sequence; receiving a first syntax from the video data that identifies a set of motion vector difference (MVD) offsets from a plurality sets of MVD offsets; receiving, a second control flag corresponding to a respective coding unit of the one or more coding units, which indicates the MMVD is applied to the coding unit; receiving a second syntax that selects an MVD offset from the identified set of MVD offsets, and a third syntax that selects an MVD direction; forming MVD based on the selected MVD offset and MVD direction; and reconstructing the coding unit by applying the formed MVD to generate motion vectors to the coding unit.