Abstract: An apparatus for transcoding an input elementary stream is provided. The apparatus includes a variety of components performing functions such as receiving the input elementary stream. A component for separating an input elementary stream into transform coefficients and their associated motion vectors is included. The apparatus also includes components for dequantizing the transform coefficients to form block transform coefficients, and determining a compensation stream using a feedback path. The apparatus combines the compensation stream from the feedback path with the block transform coefficients to form a corrected stream. The correlated stream is reduced to form an output stream having a characteristic data rate different from the characteristic data rate of the input stream. The combination of these components can provide a resultant digital video signal from the input stream.

Abstract: A method for transcoding an input elementary stream is provided. The method includes a variety of steps such as providing the input elementary stream. A step of separating an input elementary stream into transform coefficients and their associated motion vectors is included. The method then includes steps of dequantizing the transform coefficients to form block transform coefficients, and determining a compensation stream using a feedback path. The method combines the compensation stream from the feedback path with the block transform coefficients to form a corrected stream. The correlated stream is reduced to form an output stream having a characteristic data rate different from the characteristic data rate of the input stream. The combination of these steps can provide a resultant digital video signal from the input stream.