Timeline stutters


hi,

 

i've shot footage cheap samsung w300 , put on pp cs4 timeline.  when scrub it, works fine - can see footage pretty it's scrubbed , want move timeline frame frame, works great too.

 

i put footage canon eos 7d onto timeline.  i'm not sure why when scrub timeline, footage stutters.  it's hard edit footage because if you're trying move 1 frame another, stuttering slows down editing abilities.

 

both types of footage above have been placed on external hard driive (7200rpm) , have alienware 12 gb of ram.  project settings both correct - w300 1280x720 , canon 1920x1080.

 

is there reason why footage cheap camera works great footage canon seems slow down create hiccups this?

 

thanks, deaf guy

if external hard drive usb2 not fast enough video

 

external esata or usb3 both fast enough video editing... esata better - http://forums.adobe.com/thread/1117813

.

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