./muvicut .mp4 out-prefix start-sec end-sec cuts all elementary streams within the given bounds in seconds (eg. 3.5 - 13.75). to make decoding work flawlessly, it is started at the first possible I-frame, so the start point will be a little after the given start-sec! If more than one elementary stream is in the .mp4 container, all will be extracted and numbered according to their stream-IDs. Note, that the output filenames will look like: out-prefix-01.cmp .. out-prefix-04.mp3