Transmission method and system for video/audio data flow

Abstract

The invention discloses a transmission method and a system of a video-audio data stream, which relates to the mobile streaming media field. The transmission method of the video-audio data stream proposed by the invention orderly writes one frame data which can be decoded and is provided with the same time stamp into a multiplex subframe after being encapsulated into a video or an audio unit from a video or an audio stream waiting to be transmitted according to the frame boundary, The playing time information of each video or audio unit is recorded in the multiplex subframe, and the generated multiplex subframe is sent to a terminal. The method of the invention can increase the CMMB multiplexing efficiency, reduce the playing delay of the terminal and improve the de-multiplexing performance of the terminal.

Description

Method and system for transmitting video and audio data stream technical field The invention relates to the field of mobile streaming media, in particular to a method and system for transmitting video and audio data streams. Background technique The China Mobile Multimedia Broadcasting System (referred to as CMMB) standard stipulates the frame structure, channel coding and modulation of the broadcast channel transmission signal of the mobile multimedia broadcasting system within the frequency range of the broadcasting service. "Mobile Multimedia Broadcasting Part 2: Multiplexing" (referred to as CMMB multiplexing standard) stipulates that multiplexing subframes are used to encapsulate video, audio and other media data transmission, and the corresponding encapsulation structure of video, audio, and data units is defined . The CMMB multiplexing subframe is composed of a subframe header and a video or audio data segment, and information such as the encoding type of the vide...

AI Technical Summary

Problems solved by technology

It can be seen from the above content that because the multiplexing frame adopts a multi-level multiplexing form, it brings repeated header structures and wastes precious wireless channel bandwidth; and for the terminal, correspondingly, multi-level multiplexing analysis is required. This increases the calculation amount of the terminal; on the other hand, the video and audio units analyzed by the terminal are not directly decodable units, so buffering and sorting mechanisms need to be added, thereby increasing playback delay and reducing playback efficiency

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