@item list_devices
If set to @option{true}, print a list of devices and exit.
-Defaults to @option{false}.
+Defaults to @option{false}. Alternatively you can use the @code{-sinks}
+option of ffmpeg to list the available output devices.
@item list_formats
If set to @option{true}, print a list of supported formats and exit.
Amount of time to preroll video in seconds.
Defaults to @option{0.5}.
+@item duplex_mode
+Sets the decklink device duplex mode. Must be @samp{unset}, @samp{half} or @samp{full}.
+Defaults to @samp{unset}.
+
@end table
@subsection Examples