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Multiple description scalable coding based on T+2D wavelet decomposition structure is highly flexible for peerto-peer (P2P) video streaming. Finding the optimal truncation point of each code block (CB) within each description is an NP-hard problem. To implement an efficient low-complexity solution, we propose a simple clustering algorithm for partitioning the CBs into a limited number of clusters, such that one can find the optimal cluster-level redundancy-rate assignment matrix using a low-complexity full search. This approach improves the decoding quality compared to the co-echelon frameworks [1] [6] in which a non-optimal rate assignment matrix is used. In addition, the proposed clustering approach may be analytically represented by closed-form relations for lowcomplexity computation of optimal encoding parameters. The simulation results demonstrate that the adaptive proposed framework outperforms the approaches in [1] by (0.25~1dB), the scheme of [6] by (1.3~1.6dB), and the nonadaptive multiple description coding by (2.3~4.3dB). Furthermore, the proposed clustering approach requires %52-%88 less computations compared to the framework in [1].

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