In the last years, the deployment of wireless networks and the development of multimedia applications have spurred the need for reliable transmission of mixed media information over wireless links. The use of ATM-based wireless links may partially address the need of a communications infrastructure capable of meeting the QoS expectations of a wide variety of applications. The deployment of a reliable and efficient multimedia communications services over wireless links face two major constraints: the limited bandwidth availability of wireless links imposes severe constraints to the deployment o advanced multimedia applications. The second constraint refers to the high error channel rates. For these reasons, the effective transmission of video over a wireless channel requires no only the use of compression techniques capable of reducing the bandwidth demands, but also the use of video compression comprising error resilience capabilities. The ISO MPEG-4 video compression standard has been developed to fulfil these two properties. In this paper, we study the effectiveness of the MPEG-4 compression video standard error resilience techniques over a wireless channel.