1. A method of post-synchronizing an information stream, which information stream comprises an audio signal (A) and a video signal (V), the method comprising the step of: performing a translation process ( 7 ) to obtain at least one translated audio signal (A*), characterized in that the method comprises the steps of: tracking ( 2 ) said video signal (V) to obtain original lip-objects (lo); replacing ( 3, 4 ) said original lip-objects (lo) with new lip-objects (lo*), said new lip-objects (lo*) corresponding to said translated audio signal (A*).