From the forum post:
http://streamripper.sourceforge.net/phpBB2/viewtopic.php?p=4620#4620
An interesting side effect of the new overwrite
behavior is to 'touch' the current date and time to
each file, even if it isn't overwritten. I'm not sure I
like this because I can't tell if the file is new or not.
Might be fixed in latest version, but need to check.