rasplit and netflow question

I mainly use the argus daemon to generate flow records, but in one case 
I recieve netflow records and would like to store and access them in the 
same way as the argus flow data. Reception seems to be working, as 
   ra -S cisco://any:9995
outputs the expected flows (though the first line always has a 
1969-12-31 19:00 timestamp). If I try to use rasplit, though, nothing is 
written to disk using
   rasplit -M time 5m -S cisco://any:9995 -w /argus/%Y/%m/%d/%Y.%m.%d.%H.%M.%S

Should this work?

Mike Stone