Overall, one can agree that Apple successfully released a deeply recoded OS without changing massively the interface. If it is true for most components of the system, QuickTime X still appear as incomplete, no finished or optimized. A clear example is the Snow Leopard installer offering you to use QuickTime 7 by default. This is also true for all users with the limited functions available on QT X menu. But for developers QT X is even more an issue and does not deliver what was expected as reported by Christophe Ducommun on his Blog (in French):
QuickTime X was very promising, but unfortunately one can not use it with the new deciding layer of MovieGate, The reason is rather simple: to use QT X you need to use the QTkit framework, and only reading operations are allowed (n edition possible). The video decoding layer of MovieGate use Core Video in order to get the
