there is no patch for doing this because the codecs (amr and mp3) use 2 different algorithms of encoding. In the case of 3gp to mp4 it's something else. Mp4 it's a "mask" for some codecs.
an mp4 can have MPEG-4 (Part 2, Part 10 (AVC/H.264)), MPEG-2 or MPEG-1 for video codec (avc/h.264 is codec used by 3gp) and AAC, MP3, MP2, MP1, CELP, TwinVQ, or SAOL (MIDI) for audio codec.
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