- consists of an audio format, the name of the filter, and any
- options for that filter. Mote that order matters.
+ consists of an audio format specifier (see above), the name
+ of the filter, and any options for that filter. Note that
+ order matters.
+
+ The compiled-in defaults apply to all audio formats for which
+ no --filter option was given. These defaults depend on the
+ receiver being used.
+
+ For HTTP streams, only the decoder for the current audio
+ format is activated. UDP and DCCP streams, on the other
+ hand, are sent FEC-encoded by para_server. In order to play
+ such streams, the receiver output must be FEC-decoded first,
+ i.e. fed to the fecdec filter. Therefore the default for UDP
+ and DCCP streams is to activate the fecdec filter, followed
+ by the decoding filter for the audio format.