of macroblocks and slices (to make it easier for a decoder to conceal the effect of an error by interpolating from neighbouring error-free data).

7.7 CONCLUSIONS

Different choices during the design of a CODEC and different strategies for coding control can lead to significant variations in compression and computational performance between CODEC implementations. However, the best performance that may be achieved by a CODEC is limited by the available coding tools. The performance examples presented here and many other studies in the literature indicate that H.264 has the ability to out-perform MPEG-4 Visual convincingly (which in turn performs significantly better than MPEG-2). Performance is only one of many factors that influence whether a new technology is successful in the marketplace and in the final chapter we examine some of the other issues that are currently shaping the commercial market for video coding.

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