Direct mode selection based H.264/AVC (Advanced Video Coding) fast transcoding method and device

Abstract

The invention discloses direct mode selection based H.264 / AVC (Advanced Video Coding) fast transcoding method and device, which mainly overcomes the defects of high operation complexity, poor real-time performance and high occupancy rate on operation / storage and other resources in the prior art. The transcoding device comprises a decoder, a macroblock distortion estimation module, a macroblock mode selection module and a coder, wherein the decoder decodes a compressed code stream to obtain a macroblock mode, movement information, a residual and a decoding frame image; the macroblock distortion estimation module and the macroblock mode selection module perform macroblock distortion estimation and fast mode selection according to the decoding information and the reference frames of the coder and the decoder; and the coder performs RDO (Remote Data Objects) judgment to the I frame of the current GOP (Group of Pictures) and the first P frame, and counts the average distortion of the firstP frame in all optimal interframe mode as a threshold for the fast mode selection, otherwise, the fast coding is carried out on the decoding frame image to obtain the H.264 / AVC compressed code streamwith a set target code rate. The invention greatly reduces the operation complexity of transcoding and decreases the time on transcoding, and can be applied to the real-time multimedia transmission and other data transmissions.

Description

technical field [0001] The invention belongs to the technical field of network communication, relates to a fast code rate transcoding method in the H.264 / AVC (advanced video coding) standard, and can be used for real-time multimedia transmission and other data transmission. Background technique [0002] With the continuous development of mobile communication technology, the rapid increase of network access speed, the increasing intelligence of mobile terminals, and the increasing optimization of digital compression technology, mobile terminals have developed from simple communication and contact tools to a multimedia intelligent platform. At the same time, traditional value-added services such as MMS and picture and ring download can no longer meet the needs of users. The emergence of mobile streaming media will change this situation, it can provide users with services including video on demand, mobile video chat, mobile video surveillance and so on. Mobile streaming media ...

AI Technical Summary

Problems solved by technology

Since this technical solution needs to fully decode the input code stream during implementation, and then perform encoding operations such as motion estimation and encoding mode judgment on the decoded image again, the computational complexity is high, and it cannot meet the requirements of real-time video transcoding. The video communication system has a high occupancy rate of computing / storage resources, resulting in high equipment costs

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