is an exact value. For HDV, it is not frame exact, since HDV does
not have a fixed frame size.
+@item dvguid
+Select the capture device by specifying it's GUID. Capturing will only
+be performed from the specified device and fails if no device with the
+given GUID is found. This is useful to select the input if multiple
+devices are connected at the same time.
+Look at /sys/bus/firewire/devices to find out the GUIDs.
+
@end table
@subsection Examples