Since you already have an mp4 file, I think that you could rename it m4b, add it to iTunes, and that it would work.chedabob said:ive tried this guide but there is no aac option in my itunes. i have itunes 4.7.1 any ideas why? i tried converting using nero but it just creates an mp4. i used wmp, and saved the .mp3 as an m4a, but itunes wont add it to library.
The easiest is to use Markable which will take care of all the conversions (whether you have iTunes importing set to mp3 or AAC), rename the files, insert the new files in iTunes, and remove all the extraneous files for you. Well worth the $15. Try it free for five days and see if you don't agree.