Unequal error transmission protection method based on H.264 video message type

Abstract

The invention relates to an unequal error transmission protection method based on an H.264 video message type. The unequal error transmission protection method measures importance of various contents of an H.264 video message according to a practical network packet loss environment, establishes a redundancy bandwidth optimization distribution model, adopts linear coding to perform unequal mistake protection on the video stream, uses less bandwidth to realize better code stream protection and effectively reduces transmission distortion of the video.

Description

technical field [0001] The invention belongs to network video transmission technology, in particular to an unequal error transmission protection method based on H.264 video message type. Background technique [0002] Although the network video service has been widely used and greatly developed, there are still many problems to be solved and improved due to the particularities of video transmission applications. In order to obtain a high compression rate, existing video coding methods usually adopt a framework based on transform coding and motion compensation, use motion estimation and motion compensation to eliminate temporal redundancy between frames, and use transform coding and quantization operations to eliminate spatial redundancy within frames. The implementation of the above methods relies on a large number of inter-frame and intra-frame predictive coding, which is accompanied by a serious dependence between data, which makes network video streams very sensitive to ne...

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Problems solved by technology

The national invention patent of Shi Dongxin et al. [Document 2: A Raptor code method for system unequal error protection, CN104320147A] uses the Raptor code in the fountain code to perform unequal error protection on network data, but due to the complexity of the fountain code itself Higher, resulting in a relatively large delay, it is not suitable for real-time video transmission systems, and after a certain piece of data is encoded with Raptor code, if the decoding fails, all the protected source data is invalid, and the performance when dealing with a relatively high packet loss rate will greatly attenuate

The national invention patent of Dong Yuning et al. [Document 3: Real-time video communication method based on unequal error protection, CN103067719A] carried out importance classification for the group of pictures (Group of Pictures, GOP) structure of H.264 / AVC video sequence, using Forward error correction technology protects the packets composed of each video code stream. For the distortion in transmission, the error concealment method is used to recover at the decoding end without changing the video encoding rate. Therefore, when the channel bandwidth changes, it may be caused by excessive bandwidth. Large waste of bandwidth resources, or serious congestion and packet loss due to insufficient bandwidth, and this method requires the joint action of forward error correction and error concealment, that is, changes are made to both the sending end and the receiving end of the video application system, Error concealment also causes a certain delay

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