Method, device, and computer program for improving indexing, filtering, and repairing of portions of encapsulated media data

The invention relates to a method for encapsulating media data comprising samples in a media file, and an associated method of de-encapsulating the media data from a media file. A first track, 470, is generated comprising a media data part storing a first sequence of samples, Sample M etc, of a plurality of samples, and further comprising a metadata part describing the first sequence of samples. A second track, 450, is also generated comprising a media data part storing a second sequence of samples, Sample N etc, of the plurality of samples. Descriptive meta data, disd, is then generated describing a dependency between a given sample of the first track and a sample of the second track, the generated descriptive metadata being stored in the metadata part of the first track. The first and the second track are then encapsulated in the media file. Also disclosed is a processing device configured to carry out the method of the invention.