I still think it's a problem with the channel.conf. For fun, please try using the old and default scan for DVB-T. Because I used the old dvb-scan with the option to output for VDR on my Gigabyte GT-U7000-RH based DVB-T adapter to scan for KPN Digitenne bouquets (location Zwolle/Apeldoorn).
Tried this, again finds all the channels but when put into VDR no video appears (however I do see the programme listings in the EPG).
Any more ideas?