1. A decoder comprising: an input for receiving moving image data in encoded form, including a plurality of frames in which at least a region is encoded using motion estimation, wherein the moving image data comprises a respective set of motion vector values associated with each respective one of said frames or with each respective one of one or more regions within each of said frames, and wherein the moving image data further comprises at least one respective indicator associated with each of the respective frames or regions indicating whether the respective motion vector values are encoded at a first resolution or a second resolution; and a motion prediction module for decoding said frames or regions based on the motion vector values, wherein the motion prediction module is configured to read each of the indictors to determine whether the motion vector values of the respective frame or region are encoded at the first or second resolution, and if the first resolution to interpret the motion vector values in units of fractional pixels, and if the second resolution to interpret the motion vector values in units of integer pixels.