Dirac is presented by BBC to compress video streams efficiently and eliminate software payments for license fees. Dirac video codec structure allows new wavelet tools to be specified by a user in order to improve its performance. In this paper, Dirac performance is analyzed for different motion vector accuracies and with different wavelet tools. Meanwhile, a new decomposition filter scheme is proposed for Dirac to compensate computational complexity that arises due to subpixel precision analyses and filter structures of this codec. Investigated codec has a stable structure therefore correct interpretations are possible for different test sequences using the comparison tables in this paper.