ReadBoxData reads the box data from an atom box.

Parse reads an MP4 reader for atom boxes.

Open opens a file and returns an &Mp4Reader{}.

OpenFromReader read and returns an &Mp4Reader{}.

ReadBytesAt reads a box at n and offset.

GetDurationString Helper function to print a duration value in the form H:MM:SS.MS

ReadBoxAt reads a box from an offset.

GetHeight returns a calculated tkhd height.

GetWidth returns a calculated tkhd width.

OpenFromBytes read and returns an &Mp4Reader{}.