A computer-implemented method is described for automatically digitally transforming and editing video files to produce a finished video presentation. The method includes the steps of receiving from a user a selection of video clips to be made into the finished video presentation, automatically trimming the selected video clips, and automatically assembling the trimmed video clips into the finished presentation. Preferably, the method further comprises the steps of receiving a master video clip and automatically replacing portions of the master video clip with the trimmed video clips. In addition audio and visual effects may be added to the finished video presentation. Computer apparatus for performing these steps is also described.