FVL, or FourierVideo Loop, isa command-lineutility toseamlessly loopframe sequence(enumerated.png images) bycuttingspectrum ofper-pixeltransformationover time. Moreprecisely, thetime series ofeach pixelchannel,considered as asignal, isapproximated bythe partial sumof its Fourierseries. UsingFast FourierTransform toswitch betweenthe signal andits spectrum,we nullify orreduce somefrequencies todecrease theleap of thesignal at theends of thetime interval.