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A method of high definition video processing based on multitask management system is presented, which has the features of improving the real-time performance of high definition video processing,optimizing computing resource utilization rate and reducing the design difficulty of the high definition video processing. At the beginning, a kind of multitask management system based on the heterogeneous multicore computing environment is introduced, which is able to schedule and manage tasks and the loads of the computing resource. Based on this, the software pipeline is designed out to decompose the complex and repetitive video processing into several multi-type tasks, which will be submitted to the multitask management system later. Eventually, an experiment wasScarried outStoStest the technology of high definition video processing based on multitask management system. The result indicates that, the computing performance of high definition video processing could be improved twice as much in the heterogeneous multicore computing environment.