As I understand it, .mp4 is a video format.
Apple's AAC format, also know as .m4a, is the audio version of the .mp4.
and....
So, AAC or .m4a is the same thing, and your iPod should play a file in .m4a format.
MP3 is an audio format, which your iPod can play.
But a file in .mp4 format is a video file. Since there are variations in the video .mp4 format, your iPod may not play all formats of .mp4
So something about the format you are using isn't correct. How and from where did you obtain these problem files? Are they mp3 files purchased from a store, or what?
Your iPod should have no problem playing an audio file in mp3 format (the universal audio format used by everyone), along with several other formats too. The screenshot below shows the audio formats that an iPod 5th generation can handle (the Classic did not come in 30GB capacity).
dmwingon wrote:
... I really don't want to have to convert every individual song I import to AAC and then track down the original in my library and delete it so my system doesn't get bloated with extras. Also, I shouldn't have to.
You should be obtaining your music in suitable format to begin with, then you would not need to convert anything.
Buy your music from the Apple store (it will be in AAC or .m4a format) or from a recognised store such as Amazon (they'll be in .mp3 format). Import your music from CD using iTunes, which will do so using an appropriate format. If you buy from a specialist store, in a format which the iPod cannot handle, then either find another store or use something like Audacity to convert the files into .mp3 before importing into iTunes.
dmwingon wrote:
... I haven't tried any other formats, but I don't think I need to, given that the two most common ones don't work on my iPod.
But both .mp3 and AAC do work on the iPod.
dmwingon wrote:
...I'm about to dump iTunes entirely in the hopes of that fixing my problem.
...I really don't want to have to convert every individual song I import to AAC and then track down the original in my library and delete it so my system doesn't get bloated with extras. Also, I shouldn't have to.
Just a friendly word of advice... you're not dealing with Apple in this forum, we are simply fellow users like you. Ranting like that won't help anyone, but it will hinder you.