This codec will convert an aac file into an mp4 file (without loosing quality) or mp4 to aac whilst preserving ID3 tags.

Download:

http://www.dbpoweramp.com/beta/dBpowerAMP-...ec-aactomp4.exe

700KB

You will also need the latest dMC beta from here:

http://forum.dbpoweramp.com/showthread.php?t=2261

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Also I have updated the AAC codec for dBpowerAMP so it can now decode / encode:

http://forum.dbpoweramp.com/showthread.php?t=2753