Convert virtual images to RHEV ?

Looking at the virt-v2v manual, it seems all based on having a vmware/xen/etc. environment running to do conversions of virtual machines. Does anybody know how I can convert vmware images without having a running vmware setup?

F.ex. I'd want to download and run mininet from https://bitbucket.org/mininet/mininet-vm-images/downloads in RHEV. The mininet....-ovf.zip contains mininet-vm-disk1.vmdk, mininet-vm.mf and mininet-vm.ovf -- Is that convertible to RHEV somehow?