| 摘要 |
Video coding devices may signal or determine sub-integer pixel precision for motion vectors based on a direction of prediction for the motion vector, e.g., whether a reference frame is to be displayed earlier or later than a current frame. In one example, an apparatus includes a video encoder configured to encode a block of video data using a motion vector that refers to a reference frame in one of a plurality of sets of reference frames with a selected sub-integer pixel precision, generate a value representative of the selected precision for the motion vector based on the one of the plurality of sets of reference frames referred to by the motion vector, and output the encoded block and the generated value representative of the selected precision for the motion vector. A video decoder may determine a sub-integer pixel precision for the motion vector based on the value.
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