Tvheadend

In my setup, I have a dvb card (HVR-4000) and an analog v4l card (PVR-150). Some channels are bound to both the dvb and v4l cards. Being analog, the channels from the v4l card have a lower quality than the channels from the dvb card.

The problem is that the v4l card always gets precedence over the dvb card because the dvb adapter is seen as "busy" idle scanning while the v4l card is never doing any idle scanning. Therefore transport_find() always grabs the v4l card first.

The attached patch solves this by assigning a lower quality to v4l transports and ignoring v4l adapters in the first attempt to find a transport without stealing.