Soap film thinning under the effect of gravity is one of the mechanisms that govern the lifespan of a bubble inside a foam. To better understand this phenomenon, we study the thinning of single soap films inside frames which are rectangular and vertical (terrestrial gravity) or circular and spinned around their symetrical axis. In the circular case, centrifugal force mimics the effective gravity. The film thins from center to edges revealing a complex and rich mechanism. Thinner soap film elements, called patches, are created at the edges of the film. Because they are thinner, patches migrate inward, invading the central film and forming tears in the soap film. Studying this thinning dynamics enables us to understand and better predict the duration of soap bubbles inside a foam.