Extensions to the Berkeley Continuous Media Toolkit (CMT) are described that support video editing. These extensions were used to develop a Continuous Media Editor (CMEdit). The editor operates on and produces CMMovies that organize digital video and audio material into linear presentations. This source material can be located on remote servers or on a local machine. CMMovies can be played directly using CMT applications such as the CMPlayer or CMEdit. Alternatively, they can be used to assemble new source material. This approach supports the construction of highly-interactive media editors that take full advantage of the Internet.