A streaming video server includes a virtual file system that stores playlist data corresponding to a plurality of video programs available from at least one video source and that stores variant playlist data corresponding to each of the plurality of video programs that indicates a single variant for streaming each of the plurality of video programs. The streaming video server receives a request for a selected one of the plurality of video programs from a client device. The selected one of the plurality of video programs is retrieved from the at least one video source in response to the request. A rate generator generates rate data based on the transmission feedback data. A plurality of encoded segments are generated from the selected one of the plurality of video programs, based on rate data.