Quicktime File Format (2012-08-14).pdf

Some Useful Examples and ScenariosPlaying with Edit ListsMedia time[1]Media rate[1]Track duration[2]Media time[2]Media rate[2]01.06000 (10 seconds)01.0Because the track is now 2 seconds longer, the track’s duration in the track header atom must now be 7200,and the movie’s duration in the movie header atom must also be 7200.Currently, the media plays from time 0 to time 2, then plays from time 0 to time 10. If you take that repeatedsegment at the beginning (time 0 to time 2) and play it at double speed to maintain the original duration, theedit atom would now contain the following values:Atom sizeAtom type60'edts'Atom sizeAtom typeVersion/FlagsNumber of entriesTrack duration[1]Media time[1]Media rate[1]Track duration[2]Media time[2]Media rate[2]Track duration[3]Media time[3]Media rate[3]52'elst'03600 (1 second)02.0600 (1 second)02.04800 (8 seconds)2001.02012-08-14 | © 2004, 2012 Apple Inc. All Rights Reserved.357