http://fxfactory.com/fxfactorypro/

Channel Switch simulates and exasperates the action of switching channels on an analog TV with poor reception.

This effect is the transition variant of the “Analog TV” plug-in in the “FxFactory Pro Distort” category.

FxFactory is a revolutionary visual effects architecture powering hundreds of plug-ins for Final Cut Pro, Motion, Final Cut Express and Adobe After Effects:

http://fxfactory.com/fxfactory/