1. A method of encoding a sequence of images for supplying a sequence of encoded images, each encoded image comprising an image header and being cut up into slices comprising a slice header, each slice header comprising an identifier field to be identified, the identifier fields being identical for the slices of a given encoded image, the identity of the image headers of a current and a preceding encoded image involving the identity of the identifier fields of these two images, the change in an image header of a current encoded image with respect to that of a preceding encoded image involving the change of the identifier fields of said current encoded image, characterized in that the method comprises a step of filling up each bit of the identifier fields by a value reflecting an encoding characteristic of the current encoded image.