The problem of error resilience in compressed video communication is becoming increasingly important because of the growing interest in video delivery over error-prone channels such as mobile networks and the Internet. One inherent problem of such error-prone channels is channel errors. Current video compression standards achieve efficient compression by using predictive coding and variable length entropy coding. Variable length coding schemes are highly vulnerable to channel errors. Predictive coding make matters much worse since the errors quickly propagate across the entire video sequence. So the effect of these errors not only can cause great degradation of the quality of service

even can lead to the failure of the whole video communication system. Some error resilience technologies have already been included in several video coding international standards such as H.263+

H.263++and MPEG-4. This article gives a detail description of the content and principle of error resilience technologies

such as resynchronization

data partitioning

reversible variable length coding

reference picture selection mode and error concealment

etc

which are used in diversified new video coding international standards. This article also gives some simulation results of error resilience technologies based on IMT-2000 channel models. The result shows error resilience technologies can remarkably improve the subjective and objective quality of the reconstructed image.