Here is a nice list of shortcut keys for using in quicktime 7 and quicktime X on the apple mac. Also it compares differences between the two.

I never thought this was possible, but you can play a flash flv video in quicktime on the mac with the plugin perian. Sadly no longer being developed 2013!

When viewing video clips in DV codec format in Quicktime 7 the quality is low by default. But here is a very simple solution for you to sort this out.