Remuxing m4a radio files for digital audio player

[batguano999]

>I recently bought a new Sandisk Sansa Clip+ portable audio player, and 
>I've updated the firmware to Rockbox to allow it to play a greater 
>range of files. I can now play get_iplayer radio downloads in M4A 

>But they only seek correctly if I remux them using MP4Box 
>using the -ipod switch

Hi
When you run this command:-
get_iplayer --type=radio --mode=flashaacstd --pid=b03vcywt --force

Does it result in an m4a 128Kbps AAC-LC file?
And does it not seek with Sandisk Sansa Clip+ with Rockbox unless you re-mux it with MP4Box -ipod switch?
Is that what you're saying?