Hi,
there is a plugin script for amarok called 'transkode' which can encode pretty much every sound format in all others using the appropiate tools (oggenc for .ogg, lame for .mp3 and so on). It also supports profiles for all formats, so is highly customizable.
I use it all the time and it works perfectly, you can download it from within amarok (extras -> script management). Also amarok can burn through k3b (k3b will convert the sound files to .wav before burning, but haven't tried with m4a files).
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