No, xdipo is a stand-alone program, it requires X running and a lock on the
tuner, so vdr has to be stopped. It is not a perfect solution.
A perfect solution would be a new or updated rotor plugin.
Lacking that, you can visit my howto
and download the patched rotor plugin from there.
Do not patch it anymore, just enable ROTOR = 1 in your Make.config (with the
extensions patch) and it will compile ok and run on startup.
It will still crash vdr from time to time which is why I have it off now that I
don't need to tinker with sat positions, but will have to run it again in the
vdr mailing list