Synchronous Backward Error Tracking algorithm in H.264 video coding

 Abstract

Keyword- multimedia, wireless networks, error tracking, H.264, error concealment, feedback channel, error resilience.

With the prosperous development of efficient video coding and widespread Internet accessing, real-time multimedia applications over cellular mobile networks and wireless local area networks are becoming popular. However, video of multimedia service will be harmfully influenced from high variation of usable bandwidth and lack of QoS guarantee over widespread Internet and wireless network. Besides, transmission of multimedia over wireless environment is applied extensively in recent years. The objective of this thesis is to provide effective mechanism of error resilience for enhancing video quality in H.264 over wireless networks that usually come with high bit error rate.

Based on encoder process of H.264 standard to analyze internal error resilience tools and research other valid solutions such as error tracking, selection of reference frames, and automatic re-sending mechanism for error resilience. The method proposed is that the encoder can know the state of decoder and reconstruct that of decoder by utilizing backward error tracking, then the original criteria of mode decision is applied. By the simulation result, the approach proposed is always better than the conventional one and some resolution about reducing calculation and memory requirement are also mentioned.