Does anyone know of an editor that will do this on a Mac? I downloaded a fully functional demo of SimpleMovieX (one notch up above QT Pro) which does allow native (lossless) editing of H.264 files, but in a very limited way. One can only trim a clip (remove footage before and after the I/O), whereas I want something that will allow me to split a clip into smaller sections that I can then move around within the movie.