View Source Membrane.MP4.MovieBox.MovieExtendsBox (Membrane MP4 plugin v0.16.2)
The module provides a function that assembles an MPEG-4 movie extends box (
The movie extends box provides information about movie fragment boxes in case when
media data is fragmented (for example in CMAF). It has to contain as many track
extends box (
trex atoms) as there are tracks in the movie box.
For more information about the movie extends box, refer to ISO/IEC 14496-12.