Converting DASHhigh to FLAC with ffmpeg

[RS]

>Since I started looking at it Budge has asked about creating a preset.

I guess the preset is going to look something like
get_iplayer --preset=aactoflac --prefs-add --command="ffmpeg -i= 
\""<filename>"\" -f=flac -sample_fmt=s16 \""<dir>/<fileprefix>.flac"\""
in Windows and
get_iplayer --preset=aactoflac --prefs-add --command='ffmpeg -i="<filename>" 
 -f=flac -sample_fmt=s16 "<dir>/<fileprefix>.flac"'
in Linux