didn't quite understand but are you watching videos that you recorder with your N900 and they are jerky.

http://web.me.com/jamesburland/Nokia...Shootout!.html

1.2 should fix on some level this issue but you have to remember that video recording is quite power hungry thing to do so i would advise to close all the program before starting to take video. Problem might be that N900 has lot´s of scheduled stuff going on background and multitasking so i would not be suprised if email,instan messages or any other background activity hits video recording and makes it jerky. Also i advice to watch n900 overall performance and if reboot makes it considerably faster then i would recommend to flash it completely because something is not right then.