[Brad Jayne] “.mov, .wmv, .mp4. My system won’t play it back cleanly, unless I put it on the timeline and render it out. Am I missing codecs that would allow me to skip that step? Any other advice?”
If you were missing codecs you wouldn’t be able to play them, the problem is your system is under powered(dual core pentium) for realtime playback of certain HD flavors without rendering, CS3 also has some software limitations for later codec versions, codecs come out then systems and software has to play catchup, smooth realtime editing of AVCHD is looking at fast quad core processors, 64bit OS and CS5 with the Mercury playback system.