yaVDR team who develops Linux based distribution for HTPC combined the best open source HTPC software XBMC and the best open source satellite receiver software VDR, announced a new plugin yavdr-addon-pip. That plugin brings feature Picture in Picture to your media center. It works very well. Even if both channels are HD. It should be clear in case of one DVB card both channels should be from one transponder. If you have more cards you may see the channels from different transponders.