Conversion of rmm files to mp4 file format

You cannot convert .rmm files (RealMedia metafile) to other multimedia files (such as .mp4), simply because the metafile does not contain any multimedia data, just additional metadata about the size and other aspect of the actual multimedia file (.rm, .rmv, .rma etc.). It is unlikely some kind of rmm to mp4 conversion is possible at all.

Open RMM file    Open MP4 file