the invention concerns a method for encoding video data in a scalable manner according to h . 264 / svc standard . the method comprises the steps of inserting a scalable nesting supplemental enhancement information message for each layer of the data stream comprising at least one reference to the layer and a link to a supplemental enhancement information message , following the nesting supplemental enhancement information message , inserting said supplemental enhancement information message for each scalable nesting supplemental enhancement information message comprising the video usability information for said layer .