**4.3 H.264/AVC transcoding approach**

In order to provide fast and flexible transcoding at the H.264/AVC encoder side, we have to study two issues: firstly, how MVs generated during the SI process could help to reduce the time used in ME; secondly, taking into account that DVC and H.264/AVC can build different GOPs, how to map MVs between different GOP combinations in order to provide flexibility.
