The RealAudio format is defined as RTSP in Filetypes and the RTSP rules
only govern RealAudio files/streams.  

There are 3 rules for transcoding the RealAudio into WAV, MP3 and Flac.
If all 3 formats are enabled then Slimserver will choose Flac.  I had
assumed if Flac was disabled that Slimserver would choose MP3 next but
in fact (as you discovered) the order of preference is Flac, WAV, MP3.
In other words Simserver prefers lossless over compression.

Flac and WAV preserve a decoded stream (in this case RealAudio) whereas
MP3 will recompress the audio and you will have some audio degradation. 
Bandwidth requirements vary with MP3 probably about 320kbits/sec , Flac
about 1000kbits/sec and WAV about 1.5Mbits/sec (I think). So if you are
using wireless and do not have a strong signal WAV will probably not
work.  Whereas an MP3 stream not only has low bandwidth but also if
there are gaps, it is more likely to be able to continue without a
break as the SB buffer will hold more "audio seconds".  

The problem with Flac points to a potential issue which may affect
other streams but if it works at the moment, leave well alone.

It is perfectly reasonable to use MP3 on AlienBBC as long as your CPU
does not get overloaded.  Some may argue that you are losing signal
quality but the BBC streams are already compressed and slow speed
(48kb/s) so audio quality is already compromised. Disabling the RTSP
entries *only affects RealAudio* and since very few audio files are
encoded in RealAudio - the rest of your collection or internet streams
are not affected.


-- 
bpa
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View this thread: http://forums.slimdevices.com/showthread.php?t=40949

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