Dynamic voltage and frequency scaling (DVFS) technique

to some extent

controls the energy consumption for embedded multi-mode real-time video compression system.Yet

continuously decreasing voltage and frequency might affect interface resource transfers and even the normal system operations.To solve the problem

we proposed a task-aware power control method in response to task variations.We first analyzed the relationship between the workloads and processor resources

and then established a task-aware resource configuration model.Based on this model

we designed an adaptive power controller

which dynamically adjusts processor frequency and the number of cores.The experiments indicate that our method fulfills function and performance requirements of multi-mode video encoding system

with power consumption for encoding a frame reduced by 11.4% compared with traditional DVFS technique.