Using the public Internet for compressed, contribution-quality, real-time video transport has become commonplace for news, sports, and other real-time applications. Transport protocols are required to deal with the jitter and packet loss that can occur when using the Internet. Some transport protocols are proprietary and closed, and no public information exists about them. Other protocols have open specifications and offer open-source implementations. The objective of this paper is to provide a measured comparison of different open Internet contribution protocols, using a network simulator to inject packet loss, packet re-ordering, and variable delay (jitter).