If you intend to use this in Catalyst you'll only be outputting one file, one format.

When you create a composite and output, you'll have to pick the format. Since Animation was first, that is the one that the system should default to. So the entire output becomes a single file in Animation. This is unless you chose AIC as your output. Nevertheless, you aren't doing anything other than rendering a composite which becomes a single layer.

You didn't really do anything except raster.