I have some old mpeg 4 video that Composer 8.3 will read but not 8.4. Of course it is the same for the respective Quicktime Pro on the 2 Macs. I'm guessing I need a plug in but can't find any that differentiate between different flavors(part2 part10 etc,) of the mpeg 4 codec.I can convert the file in Squeeze but may run into a lot more of this and would rather solve it with a plug in or a quicker option. Can anyone lend a hand?