Systems and methods provide for dynamic generation of media content at the point that content is served. The system and method work within the bounds of simple, existing, open protocols and the media files served are playable by standard media playback clients. The method is driven by a request for media content from a client specifying an edit list. The server opens one or more source files and selects portions of one or more files to transmit based on edit list instructions, and sequentially writes those portions to an output for serving to the client. The method allows for various modifications of the content before serving.