def rotation_trigger()
   command= "php /usr/local/bin/airtime_rotation.php"
   log(label="Rotation Created",level=5,command)
    system(command)       
   
end

station_id=single(id="s_stationId","/srv/backup/files/station_id/station_id.mp3")  
 			     
s  =fallback(id="radio",
        	track_sensitive=false,
				     transitions=[transition,transition,transition], 
				     [strip_blank(id="main_silence",max_blank=240.,threshold=-70.,s),
				     on_blank(rotation_trigger, strip_blank(id="url_silence",max_blank=120.,threshold=-70.,default)),
 				     station_id])



This is the path of the script
command= "php /usr/local/bin/airtime_rotation.php"

Change this log level to 3 and when the script run it will log your file in stdout
log(label="Rotation Created",level=5,command)

This is an optional file without it will complain that the source is falliable
station_id=single(id="s_stationId","/srv/backup/files/station_id/station_id.mp3")

#people hate this because they dont know whats it for a nice smooth fade in
transitions=[transition,transition,transition],

Everbody should have this.Airtime needs this but since they hate cganging liquidsoap
its never implemented. every scrip I put it in everybody feels happy
it prevents your stream from kickng off everybody should you have nothing schedule 
or your queue becomes empty.
its 4 minutes of dead slience make it large,I find this value adequate
 
strip_blank(id="main_silence",max_blank=240.,threshold=-70.,s),

This is your trigger it explains itself,just calling the script
on_blank(rotation_trigger, strip_blank(id="url_silence",max_blank=120.,threshold=-70.,default)),