Algorithm-level Optimization for Real-time H.264/AVC Encoder

The H.264 standard achieves higher compression efficiency than previous video coding standards with the rate-distortion optimized (RDO) method for mode decision. The outstanding coding performance of H.264, however, comes at the cost of significantly increased complexity. In this paper, we present algorithm-level optimization methods: input parameter selection, fast inter-mode decision, and efficient combination of motion estimation and mode decision. Simulation results show that our optimized H.264 encoder achieves realtime encoding for video graphics array (VGA) and extended graphics array (XGA) on a commercial personal computer without introducing serious quality degradations.