Method of generating a file describing a bitstream, corresponding device and computer program product

A method, corresponding device and computer program product are provided for generating a file describing a bit stream, from a description scheme describing a structure and a content that are compliant with a predetermined format and comprising a set of attributes and elements. The bit stream includes a plurality of fields. The method includes: assigning at least one value of at least one identified filed of the stream to at least one variable defined by an attribute of the description scheme, called assignment attribute; storing the variable; determining at least one characteristic of at least one element of the description file, from and evaluation of a conditional expression relating to the value; generating a portion of the description file according to the characteristics determined in the determination step.