Download the completed VDMX project file and sample movies for this tutorial.
If you don't have a Livid OhmRGB Slim, this is still a great tutorial / template to review for the general technique.
When compositing layers of video together in VDMX or another VJ application, one of the standard techniques for combining images is the use of “masking images” which black out parts of an image by setting its transparency (alpha channel) to less than 1.0, allowing it to in front of content behind it instead of simply blending the two together.
This template is a variation on the four channel video mixer template in which we have two groups of layers (left and right bus) set up making it possible for a VJ to prepare, preview and transition between mixes on the fly, similar to how a multi-deck DJ works live. Here the idea is similar, but instead of two mixes that use separate sets of clips, in this template each bus shares the same set of four sources, each with its own set of controls for layer opacity, FX and blend modes. For an added twist, the fourth source for this template is used as a mask overlay for each bus that can be used in a variety of ways to combine the two separate mixes together in the main output.
In this video tutorial we quickly go through the design of this template and how it can be used to mix two movie clips along with an audio reactive or LFO driven Quartz Composer composition as an overlay or mask.