Method and apparatus for encapsulation of media data in a media file

A method for rendering media data from a media file, the method comprising:

• obtaining samples of media data and metadata describing the media samples from the media file;
• obtaining in the metadata a time adjustment indication relative to a duplicated sample among the obtained samples, the duplicated sample being duplicated from an original sample, the time adjustment indication indicating for the duplicated sample the relationship between the time interval corresponding to the presentation duration of the duplicated sample and the time interval corresponding to the presentation duration of the original sample;
• and
• rendering the media data of the duplicated sample based on the time adjustment indication.

A device for encapsulating media data into a media file, the device comprising a processor configured for:

• obtaining a time boundary in a time interval corresponding to the presentation duration of an original sample of the media data;
• duplicating the original sample into two consecutive duplicated samples separated by the time boundary, the two duplicated samples having a same data part corresponding to the data part of the original sample;
• generating a time adjustment indication indicating for each duplicated sample the relationship between the time interval corresponding to the presentation duration of the duplicated sample and the time interval corresponding to the presentation duration of the original sample;
• and
• encapsulating the media data comprising the duplicated samples and the time adjustment indication in the media file, the time adjustment indication being located in metadata describing the media data.

A device for rendering media data from a media file, the device comprising a processor configured for:

• obtaining samples of media data and metadata describing the media samples from the media file;
• obtaining in the metadata a time adjustment indication relative to a duplicated sample among the obtained samples, the duplicated sample being duplicated from an original sample, the time adjustment indication indicating for the duplicated sample the relationship between the time interval corresponding to the presentation duration of the duplicated sample and the time interval corresponding to the presentation duration of the original sample;
• and
• rendering the media data of the duplicated sample based on the time adjustment indication.