As we've got no interface to get tunning information for channels, the following page :
http://www.gnome.org/projects/totem/#dvb

Tells us to use w_scan to generate ~/.gstreamer-0.10/dvb-channels.conf

I did so with my DVB-T USB stick, it worked like a charm.

It did generate the file attached
TF1:562000000:I999B8C999D999M999T999G999Y999:T:27500:120:130,131,133;132:140:0:1537:0:0:0

The only problem when I tried to use it with totem is that it was never able to tune to any channel because :
 - gst wants frequency in Hz
 - w_scan puts transponder's frequency in kHz

So, it tried tunning to 562000 Hz and failed (obviously)

My proposal is to insert this somewhere in the parsing code :
if ( frq < 1000000 ) { frq *= 1000; };