my $ogg_fh = new FileHandle "ogg123....";
my $lame_fh= new FileHandle "lame.....";
my $pipe   = new FileHandle "$ogg_fh | $lame_fh &";

....

# now close your pipe and then lame and ogg123
# you should be able to just undef the handles
# as this should call close automatically
$pipe->close();
$lame_fh->close();
$ogg_fh->close();