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Abstract: Scalable wavelet-based video codecs using spatial-domain motion compensated temporal filtering (SDMCTF) require a quality-scalable motion vector codec (MVC) to support a large range of bit-rates with optimal compression efficiency. This letter introduces a new prediction-based architecture for quality-scalable motion vector coding that outperforms the state-of-the-art wavelet-based techniques previously proposed in literature. Introduction: Scalable SDMCTF-based video codecs typically use non-scalable MVCs. Targeting low bit-rates with such schemes requires generating less complex (but less accurate) motion fields, significantly affecting the overall codec performance at all rates. Using a quality-scalable MVC solves this problem. The minimum attainable bit-rate is then no longer bound by the rate needed to losslessly code the motion information. Additionally,