Here's another approach: If you want to use a single Loader to have both masked and unmasked versions of your video (it's more efficient than using two Loaders, especially if you're dealing with a video source instead of frames), you could also inject the text mask after the fact with a Matte Control. Loader goes to the background of the Matte Control, text goes into a Bitmap node, then to the garbage matte input (this input will only take a single-channel image, so you have to use the Bitmap to strip the color channels first). Check the "Invert Garbage Matte" checkbox to invert the effect so that your video appears inside the text instead of outside it.

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