This feature works as a software enabled video and audio crossbar (a coordinated switching system). In earlier versions of Viz Engine every video channel was bound to one physical video in a channel. The use of another physical input was only possible if the setting in the Viz Configuration was changed.

Seamless input channel switching changes this binding seamlessly, even during play out. It is also possible to use more inputs than the number of licensed channels, for example, if a video card is equipped with an X.RIO card. However, only the number of licensed channels can be used simultaneously. At the moment the switching is only possible with commands.

The initial setting is defined by the configuration. In run time change the used video input channel with the commands listed here:

• Change the Input Channel
  The command, RENDERER*VIDEO*VIDEOIN*1*LEASE SET B, sets video channel 1 to use physical input B as its source. If used during play out, the change happens at the next frame. If you try to lease an invalid channel or a channel that is currently used by another Viz Engine input, you will get Invalid as a result.

• Check the Input Channel
  The command, RENDERER*VIDEO*VIDEOIN*2*LEASE GET, checks which physical input is currently mapped to Viz Engine’s channel 2.

• Release the Input Channel
  The command, RENDERER*VIDEO*VIDEOIN*1*LEASE RELEASE, releases the currently captured physical input channel.

• Get the Free Physical Inputs
  The command, RENDERER*VIDEO*VIDEOIN*3*FREE_DEVICES GET, lists the free physical inputs as a comma separated list (e.g. A, C, E, F).