Where an ISO base media file keeps its frame index, read from the top-level
box headers alone.
Each header states the size of its own box, so the walk hops from one to the
next and never reads a box's contents: eight to sixteen bytes per box, and no
more boxes than it takes to see moov or moof. Over a link that is a
handful of range requests whatever the file weighs.
Where an ISO base media file keeps its frame index, read from the top-level box headers alone.
Each header states the size of its own box, so the walk hops from one to the next and never reads a box's contents: eight to sixteen bytes per box, and no more boxes than it takes to see
moovormoof. Over a link that is a handful of range requests whatever the file weighs.