Just buy a really cheap mp4 player or convert your music to a more general format, like mp3. If you want to play actual .mp4 movie files, not just .m4a audio, forget about it, it's not happening.
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A project that is unlikely to succeed with out extensive software and hardware knowledge and experience. Sorry.
Um.... Well I think that's impossible because the design is closely guarded by the businesses that make them.... sorry!