mov versus mp4 and mp3 as aac

[Kevin Lynch]

All
I have get_iplayer working on both ubuntu and win xp (32 bit). I
prefer my media as mp4 and mp3 occasionally material is saved as mov
and aac (it's no big problem I re-wrap with mp4box/gpac on ubuntu)

for file in *.mov
do
	filename=`echo $file | sed 's/.mov//g'`
	ls -l  $filename.mov
	MP4Box -add $filename.mov -new "$filename.mp4"
done

These versions
ii  gpac                                 0.4.5-0.3ubuntu6
                  multimedia framework based on the MPEG-4 Sys
ii  libgpac0.4.5                         0.4.5-0.3ubuntu6
                  multimedia framework based on the MPEG-4 Sys

or I have QT 7 pro which has an option to rewrap mov as MP4 under export

I use winff (windows/ubuntu) to transcode AAC as MP3

My question is what do I have to do to get_iplayer to save MP4/MP3 by default

Thanks

Kevin