Jagged edges when viewing video

Hello all,
let's see if I'm able to describe this problem adequately.
I have taken short video clips with, now two different camera (AVCHD used), imported into iPhoto and viewed within. During playback there are severe jagged blocks mostly around the outlines of moving subjects. If the subject stops moving this effect disappears but resumes as soon there once again is movement. This isn't even subtle, the videos are quite unwatchable.
What I have tried is export those videos out of iPhoto and opened them with QT. There was no such problem and the video was smooth throughout.
I don't quite understand what is happening here.
Cheers Argento

As a test launch iPhoto with the Option key held down and create a new, test library.  Import some photos and test to see if the same problem persists. Does it?
If it does try the following:
1 - delete the iPhoto preference file, com.apple.iPhoto.plist, that resides in your
     User/Home/Library/ Preferences folder.
2 - delete the contents the following folder:
User/Library/Containers/com.apple.iPhoto
3 - reboot, launch iPhoto and try again.
NOTE: For Mavericks, 10.9,  go to your Home folder and use the View ➙ Show View Options menu to bring the this window:
where you can check the Show Library Folder checkbox.
If it doesn't try the following:
1 - launch iPhoto with the Command+Option keys held down and rebuild the library.
2 - Run Option #4, Rebuild Database, followed by Option #1 if needed.

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