Multi-user panoramic video transmission method

Abstract

The invention provides a multi-user panoramic video transmission method, which is characterized by comprising the following steps of: 1, a model is defined for a multi-user panoramic video transmission problem, and a QoE index is quantified; 2, the code rate decision maker records the states of all clients participating in streaming media transmission, if the number of users is smaller than or equal to 5, a global optimization algorithm is used for distributing panoramic video transmission bandwidth, and a traversal code rate distribution scheme is used for solving a global QoE optimal solution of multiple users; if the number of the users is greater than 5, a panoramic video transmission bandwidth is allocated by using a heuristic allocation method based on the length of a user cache queue; and 3, the client side requests the video block, the server side responds to the video block i and pushes data, and in the step 1, for the QoE of the user c to the video block i, the QoE is specifically defined as the weighted sum of four factors including viewport definition Q, intra-frame quality smoothness VI, inter-frame quality smoothness ViB and pause duration TiS.

Description

technical field [0001] The invention belongs to the field of streaming media video transmission, and in particular relates to a multi-user panoramic video transmission method. Background technique [0002] 360° video, also known as Panoramic video or Omnidirectional video, refers to a video that allows viewers to see a 360° omnidirectional scene at any moment through a helmet-mounted VR device, a mobile phone, or dragging a computer screen. Video acquisition is usually achieved with the help of multi-camera panoramic cameras and corresponding stitching algorithms, and then affine the spherical video to a two-dimensional plane through projection algorithms such as equidistant cylindrical projection (ERP, Equirectangular Projection) or rectangular spherical projection (CMP, Cubemap Projection) . [0003] 360° video is getting more and more attention from almost all mainstream content providers and mass users. Service providers including iQiyi, Facebook, Netflix, and Hulu are...

AI Technical Summary

Problems solved by technology

The tile-based 360° transmission method was proposed under this background, but its disadvantage is that, like the traditional adaptive bit rate transmission algorithm, the performance of all current tile-based client-side algorithms is limited by the client. The network bandwidth estimation error is greatly limited by the terminal, and the introduction of the viewing angle prediction error in the grid-based algorithm poses a greater challenge to the related algorithm design

[0005] The existing panoramic video transmission algorithm will cause a lot of errors due to inaccurate prediction when predicting bandwidth and user perspective, resulting in a significant drop in QoE

An important reason for this situation is that the current algorithms all predict variables from the perspective of the client, but the client's limited prior knowledge of the entire network limits the upper performance limit that this type of method can achieve.

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