Abstract: Disclosed in the embodiments of the present application are an encoding method, a decoding method, a code stream, an encoder, a decoder, and a storage medium. The decoding method comprises: decoding a code stream and determining a value of preset identification information; when the preset identification information indicates that a first quantization parameter of the current point cloud enables a target setting mode, determining a first feature value according to the current point cloud; and determining a value of the first quantization parameter according to the first feature value.

Abstract: Provided are a data processing method and apparatus, a communication node, and a storage medium. The data processing method includes determining multi-frame combined point cloud information; writing the multi-frame combined point cloud information into media streams of combined point cloud data; and sending, according to the multi-frame combined point cloud information, the media streams of the combined point cloud data to a receiving end separately.

Abstract: Provided are a data transmission method, apparatus and device, and a storage medium. The data transmission method includes the following: receiving current status information sent by a client; determining status-dependent point cloud spatial region information corresponding to the current status information according to the current status information; selecting status-dependent point cloud spatial region data corresponding to the status-dependent point cloud spatial region information; and sending the status-dependent point cloud spatial region information and the status-dependent point cloud spatial region data to the client.

Abstract: Provided are a video file sending method, a video file receiving method, and a terminal. In the method, at least two videos captured under at least two view angles are determined. A first video file is generated based on the at least two videos and multi-view file description information, and the first video file is written into a bitstream. The multi-view file description information is used to instruct a terminal to decode the first video file in a multi-view manner.

Abstract: Provided are a point cloud quality evaluation method and device and a storage medium.

Abstract: Shared memory management methods and apparatuses are provided. In an implementation, an apparatus comprises a virtual machine monitor, a virtual machine, and a trusted execution environment (TEE). The virtual machine monitor is configured to determine, based on the address information, whether a first address is comprised in the shared memory when a page fault occurs in response to the trusted part requests to access the first address, and in response to determining that the first address is comprised in the shared memory, send an interrupt notification to the virtual machine. The virtual machine is configured to: in response to the interrupt notification and determining, based on the address information, that the first address is comprised in the shared memory, validate a first page table entry in the first page table, and return a response message to the virtual machine monitor, wherein the first page table entry comprises address mapping information of a first page that comprises the first address.

Abstract: Provided are a point cloud data encapsulation method and a point cloud data transmission method. The point cloud data encapsulation method includes: compressing a point cloud media file; and encapsulating the compressed point cloud media file and setting a classification record according to a data type, where the classification record is used for indicating a data type of each portion of point cloud data in the point cloud media file. The problem of low transmission efficiency of the media content and waste of storage space in the point cloud data transmission is solved, the flexibility of the media content combination is increased, management control of a multimedia service is increased, users are given more rights to independently select and acquire the media content, diversified application scenarios are provided, and better multimedia content provision and transmission solutions are provided for network operators.

Abstract: Provided are a three-dimensional point cloud transmission method and apparatus, a three-dimensional point cloud receiving method and apparatus, and a medium. The transmission method includes the following steps. The point cloud data of an original point cloud is parsed. The quality level of the space region of a to-be-transmitted point cloud is determined. The point cloud data in the space region of the to-be-transmitted point cloud is selected according to the quality level of the space region of the to-be-transmitted point cloud to generate a media code stream. The quality indication information of the space region of the to-be-transmitted point cloud is determined according to the selected point cloud data in the space region of the to-be-transmitted point cloud. The quality indication information of the space region of the to-be-transmitted point cloud is written into the media code stream. The media code stream is transmitted.

Abstract: Provided is a media processing method. The method is used for uploading a function provided by a user or a third party and obtaining media processing parameters provided by the user. The method includes the following steps: receiving the description information of the media processing and determining whether a function that fulfills the requirement of the description information exists in a system; in a case where the function that fulfills the requirement of the description information exists, selecting the function that fulfills the requirement of the description information from the system; and in a case where the function that fulfills the requirement of the description information does not exist, selecting the function from the system according to the priority or selecting the function that fulfills the requirement of the description information from outside the system.

Abstract: Provided are a data processing method and apparatus, a communication node, and a storage medium. The data processing method includes determining multi-frame combined point cloud information; writing the multi-frame combined point cloud information into media streams of combined point cloud data; and sending, according to the multi-frame combined point cloud information, the media streams of the combined point cloud data to a receiving end separately.

Abstract: Provided are a data transmission method, apparatus and device, and a storage medium. The data transmission method includes the following: receiving current status information sent by a client; determining status-dependent point cloud spatial region information corresponding to the current status information according to the current status information; selecting status-dependent point cloud spatial region data corresponding to the status-dependent point cloud spatial region information; and sending the status-dependent point cloud spatial region information and the status-dependent point cloud spatial region data to the client.

Abstract: Provided are an initial view angle control and presentation method and system based on a three-dimensional point cloud and a point cloud system. A three-dimensional media stream is read and parsed. An initial viewpoint, a normal vector and a forward direction vector in the three-dimensional media stream are parsed. A user can view an initial angle, that is, a region of interest, designated by a content producer when initially consuming three-dimensional media content. Moreover, scaling, that is, scale transformation, of the three-dimensional media content is allowed in an optimized manner. In a real-time interactive scene, the view range of the user can be adjusted based on the position of the user relative to the initial viewpoint. The freedom degree of visual media consumption is fully improved according to the interactive behavior of the user, providing an immersive user experience.

Abstract: The present invention provides two forms of information interaction mechanisms and network transmission methods in a multimedia system. One is implementing bidirectional quick information interaction by using an interaction message body, so that the defect that there is no efficient and flexible bidirectional information interaction mechanism in existing media transmission systems can be overcome, and the mechanism is applicable to all media transmission systems. The other one is simplifying the size of protocol format header data for a simplest data packet forced by a protocol transmission format, so that the protocol format is quickly adapted to quick information interaction. The simplifying the size of protocol format header data can overcome the defect that there is no efficient bidirectional quick information interaction mechanism in the existing media transmission systems. In addition, an optimized transmission mechanism for a still image in a video stream is provided.

Abstract: Provided are a point cloud data encapsulation method and a point cloud data transmission method. The point cloud data encapsulation method includes: compressing a point cloud media file; and encapsulating the compressed point cloud media file and setting a classification record according to a data type, where the classification record is used for indicating a data type of each portion of point cloud data in the point cloud media file. The problem of low transmission efficiency of the media content and waste of storage space in the point cloud data transmission is solved, the flexibility of the media content combination is increased, management control of a multimedia service is increased, users are given more rights to independently select and acquire the media content, diversified application scenarios are provided, and better multimedia content provision and transmission solutions are provided for network operators.

Abstract: A media content-based adaptive method, device and system for Forward Error Correction (FEC) coding and decoding of a systematic code, and a medium are provided. The method includes: dividing, according to the importance of media content, source data into N types of source data packets according to priorities; generating N types of intermediate codes according to the N types of source data packets and the priorities thereof; setting, according to the N types of intermediate codes, recovery data of N types of source data according to a channel condition, and generating coded symbols of N types of systematic codes; receiving the coded symbols, and arranging and sorting the coded symbols according to decoding requirements; and decoding, according to the number of received coded symbols, intermediate codewords according to different situations, and recovering the corresponding source data packets according to the intermediate codewords.

Abstract: Provided is a media processing method. The method is used for uploading a function provided by a user or a third party and obtaining media processing parameters provided by the user. The method includes the following steps: receiving the description information of the media processing and determining whether a function that fulfills the requirement of the description information exists in a system; in a case where the function that fulfills the requirement of the description information exists, selecting the function that fulfills the requirement of the description information from the system; and in a case where the function that fulfills the requirement of the description information does not exist, selecting the function from the system according to the priority or selecting the function that fulfills the requirement of the description information from outside the system.

Abstract: Provided are an initial view angle control and presentation method and system based on a three-dimensional point cloud and a point cloud system. A three-dimensional media stream is read and parsed. An initial viewpoint, a normal vector and a forward direction vector in the three-dimensional media stream are parsed. A user can view an initial angle, that is, a region of interest, designated by a content producer when initially consuming three-dimensional media content. Moreover, scaling, that is, scale transformation, of the three-dimensional media content is allowed in an optimized manner. In a real-time interactive scene, the view range of the user can be adjusted based on the position of the user relative to the initial viewpoint. The freedom degree of visual media consumption is fully improved according to the interactive behavior of the user, providing an immersive user experience.

Abstract: The present disclosure discloses a method for synchronously pushing a multimedia resource based on a heterogeneous network. The method includes: step 1: obtaining, by a server, end-to-end broadband network delay information or broadband network delay and available bandwidth information of different users; step 2: after receiving a client request, calculating, by the server according to the end-to-end broadband network delay information or the broadband network delay and available bandwidth information of the different users, a moment at which the multimedia resource can be synchronously presented; and step 3: sending, by the server, the multimedia resource after the moment at which the multimedia resource can be synchronously presented, and synchronously playing, by a client, content according to a start presentation time of the multimedia resource, so that broadband content of the different users can be synchronously presented.

Abstract: The present disclosure provides a method and a system for personalized presentation of a multimedia content assembly, including: presenting, on a server, by using a presentation mode in which one or more presentation layers superimpose, a media content component, and sending signaling information for describing a presentation layer layout to a client; presenting, on the client, a multimedia content assembly in a personalized manner according to the signaling information of the presentation layer. In the present disclosure, a content provider can instruct a user to perform combination presentation on multi-channel content at a client device vendor, and adjust a layout by a reduced update instruction. In addition, the present disclosure provides a media service applicable to a case in which terminal devices are different and user needs are different.

Abstract: In a method and device for fingerprinting magnetic resonance imaging, a first sequence of MR data is acquired within a region of interest using a fingerprinting magnetic resonance pulse sequence; the first sequence of MR data is input to a neural network; a second sequence of MR data from the neural network is output from the neural network, the second sequence of MR data having reduced undersampling/aliasing artifacts and/or noise compared to the first sequence of MR data; values of at least one quantitative parameter are determined for the region of interest based on the second sequence of MR data; and a quantitative parameter map of the at least one quantitative parameter for the region of interest is constructed based on the determined values.