The rate-distortion optimal mode decision as well as motion estimation adopted in H.264 brings a big challenge to real-time encoding and transcoding duo to the high computation complexity. This paper proposes a hierarchical motion description model to present the motion data of each MacroBlock (MB) from coarsely to finely. A preprocessing approach is developed to estimate the motion data for each MB at each quality level with regard to its reference quality, its adjacent MBs and the target bit-rate. The resulting motion data can be coded and stored as metadata in a media file or a stream. Moreover, the paper proposes a method to readily extract the specific motion data from the model for each MB at given bit-rates.
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