Radio File Format Questions

[Budgie]

Further to my attempts to sort out my radio downloads, the size anomaly, 
which has been explained and non playing of some files, I found that the 
low bitrate file I mentioned earlier would not play on my Linn SneakyDS 
but the larger file did play.  Both files played well on other renderers.

I sought help on the Linn forum and this is the consequential post  from 
bubbleguuum, addressed to Linn Development Forum:-

[quote]Here's a HE-AAC v2 file that doesn't play on a DS.
It is from a BBC podcast.

It is an 48Kbps AAC SBR+PS file. foobar2000 and VLC play it.
Playing it to a DS fails silently. [quote]

As usual, a couple of questions.

Is the file format HE-AAC v2 the normal output for a low bit rate 
download or is it another, to me, anomaly?

What programme can I use to find out the detailed information of what is 
in each .m4a file?  I have used AtomicParsley to discover tagging 
metadata and then qtfaststart to sort out order of atoms where for 
whatever reason, these have been screwed up.

Pending Linn sorting out their DS player what would you recommend I run 
to change the format of the sound file and to what format?

Regards,
Budgie