Techniques related to providing motion estimation for arbitrary pixel block shapes are discussed. Such techniques may include generating a distortion mesh for a pixel block based on multiple calls to a motion estimation such that the distortion mesh includes distortion values associated with regions of the pixel block, a seed motion vector, and candidate motion vectors, and determining a best motion vector for the pixel block based on the distortion mesh.

An encoder includes circuitry and memory. Using the memory, the circuitry, in inter prediction processing: derives a first motion vector of a current block to be processed, using a motion vector of a previous block which has been previously processed; derives a second motion vector of the current block by performing motion estimation in the vicinity of the first motion vector; and generates a prediction image of the current block by performing motion compensation using the second motion vector.

The present invention relates to a multicast-based content transmitting system and method, and a device and method for estimating high-speed movement. Included are: a content providing device for generating N×M multicast stream channels having different transmission start times and transmission rates, providing N×M multicast stream channel lists, and transmitting content through one channel of N×M multicast stream channels; and a user terminal for selecting one channel of the N×M multicast stream channel lists provided from the content providing device and receiving content through the selected multicast stream channel.

Embodiments of the present disclosure provide methods, apparatuses and computer storage media for video processing. One example method comprises determining, during a conversion between a current video block of a video and a bitstream of the video, a set of motion candidates for the current video block; determining, for each motion candidate in the set of motion candidates, a refined motion candidate by performing a local search around the each motion candidate based on a template matching cost rule; determining, from a set of refined motion candidates generated for the set of motion candidates, a target motion candidate for the current video block; and performing the conversion based on the target motion candidate.

According to an embodiment disclosed in the present specification, a history-based motion vector prediction (HMVP) candidate set with respect to a current block may be derived based on a history, the HMVP candidate set may be updated or initialized according to a condition, and motion information of the current block may be derived based on the HMVP candidate set, through which inter prediction efficiency can be improved.

According to an embodiment disclosed in the present specification, a history-based motion vector prediction (HMVP) candidate set with respect to a current block may be derived based on a history, the HMVP candidate set may be updated or initialized according to a condition, and motion information of the current block may be derived based on the HMVP candidate set, through which inter prediction efficiency can be improved.

Processing methods for motion compensation, an encoder, and a decoder are provided. The method includes the following. Determine a search position constellation with a point pointed by an initial motion vector as a center point, where the search position constellation includes N directions, search for at least one search point by using at least one type of step lengths in the directions, where the at least one search point at least includes at least one search point in diagonal directions. Search for at least one search position from the search position constellation based on a preset range coverage rule, where the preset range coverage rule is to arrange search points in the directions for search. Obtain a new motion vector according to the at least one search position, and perform motion compensation based on the new motion vector to obtain a prediction value of a coding unit (CU).

Scalable motion estimation is provided for macroblocks of a picture with the macroblocks being subdividable into partitions of different shapes and sizes. One embodiment of a method for performing motion estimation includes setting a target complexity for a macroblock of a source frame and performing motion estimation for one or more partitions of the macroblock until the target complexity is met. The macroblock partitions can be rectangular, square or a combination of rectangular and square.

Scalable motion estimation is provided for macroblocks of a picture with the macroblocks being subdividable into partitions of different shapes and sizes. One embodiment of a method for performing motion estimation includes setting a target complexity for a macroblock of a source frame and performing motion estimation for one or more partitions of the macroblock until the target complexity is met. The macroblock partitions can be rectangular, square or a combination of rectangular and square.

The present disclosure relates to means to enable reduction of memory access in motion vector determination and/or refinement for a prediction block. In particular, the present disclosure relates to means to enable reduction of memory access in motion vector determination and/or refinement performed on a sub prediction block basis. In other words, a prediction block is split into sub prediction blocks for which at least the motion vector refinement is performed individually. The memory access window which limits the samples accessible during the motion vector determination and refinement of the sub prediction blocks does not exceed the memory access window for performing the motion vector determination and/or refinement for the prediction block.