Name of this field

group_description_index

Description

gives the index of the sample group entry which describes the samples in this group

Source

ISO IEC 14496-12 (MPEG-4 ISO base media file format):
moov/trak/mdia/minf/stbl/sbgp

List of checks involving this field

usacIndependencyFlag is 1 but MP4 stts or (container format) (container element for independent frame (IF)) does not indicate this frame is independent
(container format) (container element for immediate play-out frame (IPF)) or (container format) (container element for independent frame (IF)) does not indicate this frame is independent but (content format) (content element) (content field) (value) indicates this frame is independent
(container format) (container element for independent frame (IF)) indicates this frame is an independent frame (IF) but (content format) (content element) (content field) (value ) indicates this frame is not an independent frame (IF)
(container format) (container element for independent frame (IF)) indicates this frame is an independent frame (IF) but USAC AudioPreRoll is present
(container format) (container element for independent frame (IF)) does not indicate this frame is an independent frame (IF) but USAC AudioPreRoll is not present