Vegas 12.0 build 770 64bit
PC running Win10
Before upgrading to Win10 from Win 7, I connected my analog video source to a Canon DV camcorder in the AV in to DV out mode, and had great results capturing video for many years.
Now, it doesn't recognize the device, with either capture app. Everything else has worked perfectly after the OS upgrade.
The DV cam is connected to PC through IEEE 1394 card which is shown as functioning properly. The card driver is shown as being the latest.