.m4a (aac) audio files don't appear in podcast/iTunes

My blog is at http://jumplive.blogspot.com
[ I'm using Feedburner.com, with Smartcast enabled ]
My audio files are (native) .wma. I used Windows iTunes to convert them to .wav & .m4a (aac).
The audio files ".wav" are showing up in iTunes/podcast. However, the .aac (with extension .m4a..it's MPEG4, right?) are not showing up. ?? (I'm storing the audio files on blip.tv servers)
[ Is there anyway of getting the (native) .wma files to show up? The .aac & .wav files are considerably larger than the (native) .wma files, which is bad. For example, a 17mb A.wma file converts to a 34mb A.aac & 64mb A.wav . Am I doing something wrong in the Conversion settings under Preferences? ]

My audio files are (native) .wma. I used Windows
iTunes to convert them to .wav & .m4a (aac).
The audio files ".wav" are showing up in
iTunes/podcast. However, the .aac (with extension
.m4a..it's MPEG4, right?) are not showing up. ??
(I'm storing the audio files on blip.tv servers)
Your feedburner feed doesn't contain any M4A files that I can see. That would be one reason they don't show up.
[ Is there anyway of getting the (native) .wma files
to show up? The .aac & .wav files are considerably
larger than the (native) .wma files, which is bad.
For example, a 17mb A.wma file converts to a 34mb
A.aac & 64mb A.wav . Am I doing something wrong in
the Conversion settings under Preferences? ]
Okay, first, are they .aac or .m4a files? iTunes will get *.m4a files, but not *.aac files.
Secondly, size is all about bitrate. If you use a higher bitrate, you get bigger files. WMA tends to default to a 64kbps bitrate, which usually sounds like utter crap. M4A (AAC) generally defaults to 128kbps. So with default settings, it'll be twice the size.
However, you say you're converting from WMA to M4A and WAV? That's a bad, bad idea. You should be converting from the original recording (in WAV format) to MP3 and M4A. MP3 is more widely supported for podcasting, and M4A is supported by iTunes and sounds better than MP3. Nobody uses WMA for podcasting. WMA sounds terrible.

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