[vdr] VDR on DBox2

Hello, I've got a VDR server running with vdr-1.3.17. I also run a VDR streaming client (VIA Epia based) with vdr-1.3.11 over streamdev and NFS without problems. Now I try to get VDR running on a DBox2. The tuxbox project (Linux for Dbox2) incorporates a patched vdr-1.2.6. I could get this installed, OSD works, remote control works with LIRC. My problem is, if I try to replay a recording from the server via NFS, data gets streamed, but I see no pictures and hear no sound... Is anybody else running VDR on Dbox2 ? Is the recording format (of 001.vdr, e.g.) backward-compatible from 1.3.17 to 1.2.6 ? Greetings, Matthias