In this paper, we propose the seamless video transmission scheme over wireless LANs during fast handover in Mobile IPv6. In fact, a mobile node cannot receive the IP packets during handover. A number of extensions to fast handover for mobile IPv6 have been introduced to recover its weakness. Fast handover algorithm in Mobile IPv6 allows the new access router in the adjacent cell to pre-buffer the data packets of a mobile node to prevent packet loss. In a mobile communication environment, however, transmission of multimedia data should consider the realtimeliness of the data. We focus on the multimedia data delivery during fast handover in Mobile IPv6 environment.