The TV server is "copying" the DVB stream directly to the disk. So as long as every station in the whole world is using .ts as container for broadcast this will not be changed. In principle DVR-MS and WTV also are TS but with additional DRM management options added by Microsoft to calm down the content "mafia" that did not like the ability to do an exact copy of the broadcast stream....or can't and will it never handle formats other than .ts?