Error Recovery Mechanisms Based on Retransmissions for Video Coded with Motion Compensation Techniques

Error recovery mechanisms based on retransmission (ERMBR) have often been left out from the interactive video transport process because they are considered as producers of additional latency in frame playout time; that is only partially true. ERMBR introduce additional latency if the service constraints are rigid (such as those considered by Connection Oriented (CO) services) but if the constraints are reduced, the additional latency can be greatly reduced. These aspects have inspired the Partial Order and partial reliability Connection (POC) concept employed in this work. A POC connection provides a configurable service authorized to involve both a number of losses and a degree of mis-order. In this document, the ERMBR mechanisms forming a POC service are successfully used in the context of Video Coded with Motion Compensation Prediction Techniques (VCMCPT) in order to provide both a suitable error recovering and continuous service. These advantages are illustrated through an implementation of a video server system formed by a POC service and an ad-hoc MPEG decoder.