Rapid algorithms for MPEG-2 to H.264 transcoding

The bandwidth saving of H.264 compared with MPEG-2 provides a big motivation to migrate to H.264, and this inspires the research on MPFG-2 to H.264 transcoding. We proposed two fast algorithms for MPEG-2 to H.264 transcoding in DCT domain. The first one synthesizes a H.264 integer DCT block for motion compensation from four intersected integer DCT blocks using only a few additions and shift operations. The second algorithm shows our rapid solution on dealing with the difference of scale in the integer DCT domain before and after the quantization procedure and replace the division operations with multiplications and shift operations. They are very useful in MPEG to H.264 DcT domain transcoder designing, especially for embedded RISC processors.