System and Method for Macroblock Transcoding

摘要

An embodiment method of transcoding a macroblock coded in one of a Skip mode and a Direct mode includes recording a first reference frame index and a first motion vector corresponding to the macroblock during a decoding process and deriving a second reference frame index and a second motion vector corresponding to the macroblock during an encoding process. The method further includes comparing the first reference frame index to the second reference frame index and the first motion vector to the second motion vector during the encoding process. If the comparing achieves a predetermined criteria, the Skip mode and the Direct mode are reused to encode the macroblock during the encoding process.