A kind of forwarding method, device and system of encoded video stream

Abstract

The invention provides an encoded video stream forwarding method. The method comprises the following steps: (1) receiving at least one path of original encoded video streams, and decoding the original encoded video streams in real time to obtain original image sequences; (2) receiving a request of one video stream of the video streams from a client; and (3) performing intra-frame encoding on the original image sequence corresponding to the video stream requested by the client, constructing a video stream header by using an intra-frame encoding image frame, transmitting the video stream header to the client, and forwarding an original encoded video stream corresponding to the video stream requested by the client to the client. The invention also provides a corresponding encoded video stream forwarding device and system. Through adoption of the method, the device and the system, the advantages of low complexity in encoding and decoding, small delay and small code rate of original large GOP (Group of Pictures) encoded video streams can be kept; the phenomenon of abnormal display during video stream switching can be restrained; and the user experience is improved remarkably.

Description

technical field [0001] The present invention relates to the technical fields of video coding and video transmission, and in particular, the present invention relates to a method, device and system for forwarding coded video streams. Background technique [0002] H.264 / AVC is a relatively mainstream video encoding method and was officially released in March 2005. It has relatively excellent compression performance and is widely used in various fields such as radio and television, network video, and monitoring. Different from the traditional H.264 video coding method, in some new application scenarios, a special coding strategy will be adopted during video coding, that is, a large GOP coding strategy. For example, in a pure P-frame video stream, the intra-frame encoding method in this video stream is very rare, and there is only one recovery point every 120 frames. The large GOP coding strategy has two main advantages: first, it can reduce the complexity of coding and decodi...

AI Technical Summary

Problems solved by technology

However, the large GOP encoding strategy also has obvious disadvantages: when the user randomly accesses or switches the video stream, the decoding process starts from any random point in the video stream, and when the video stream to be accessed or switched to When the GOP is large and most of the frames in the GOP are encoded with P or B frames, the decoding process is often P or B for a long time after the start of the decoding process, causing the client to fail to decode normally due to the lack of accurate reference images and display, which will give users a poor experience

Especially in applications where switching video streams is more frequent, the above defects will become more intolerable

Images