Abstract:

This paper studies the X264 encoder on the basis of a thorough knowledge about the H.264 standard, aiming to accelerate the encoding speed and enhance the encoder’s realtime ability. In the context of the data dependencies of the related macroblocks which are mainly analyzed, considering the characteristics of the parallel coding algorithm based on the macroblocklevel of InterFrame, the paper proposes a new multithread parallel coding algorithm. On the basis of the original multithread parallel algorithm of the interframe macroblocklevel and the following spatial correlation conditions,the algorithm which creates a thread for each row in the I frame,implements the parallel encoding of the interframe and intraframe macroblocklevel and achieves the effect of multigranularity parallelism.The experimental results illustrate that the propsed algorithm improves the encoding speedup while the video sequences are effectively encoded and with the PSNR holds basically unchanged.,and the realtime encoding is enhanced.

Key words: X264;parallel coding;macroblocklevel;interframe;multithread