Why are video clips glitchy in iMovie?

Hi!
I have a bunch of 1080p clips that have come off of a Panasonic GF3 digital camera. These were in .MTS format, but iMovie won't touch those unless they came straight off the camera (and they came off it a while ago). Instead, I used avconv (ffmpeg) to losslessly convert the MTS files to MP4. The new MP4 files play flawlessly on Mac (Quicktime), Windows and Linux.
However when I import them into iMovie, it completely messes them up. Any areas of the image that move get 'torn' and then 'repainted' one second later (on each keyframe). I'd put this down to the iMovie preview, but after rendering the completed iMovie project out I get exactly the same problem.
Does anyone know what the problem is or how I can fix this? I have basically finished my project now - only to find that the preview errors are permanent!
I have iMovie 10.0.5, and MacOS 10.9.5. I can provide example videos that exhibit the tearing if needed, as well as the final result of iMovie's rendering.
thanks,
- Gordon

Hello,
It's a long story, for the past year I've been trying to make a few simple slideshows from iPHOTO. Yes, it is suppose to be this simple few step process to send photos over to iDVD but it never works for me. In the beginning I was on the phone with the Apple help line and they would give me instruction. When one set of instructions did not work, the Apple help line person would give me different instructions. In the end the DVD slideshow was made/burned.
I've taken a few trips and I'm back to trying to make a DVD-R slideshow. I discovered through this discussion thread (see my question Why can't I make an IDVD
Posted: Jan 14, 2007 1:17 PM) that I need to go into Customize/Media/iMOVIE in iDVD and select the last slideshow that I imported and the process worked. Well I discovered that my fifty plus slideshows are sitting in iMOVIE. Most of the slideshows are repeats and I want to delete all of these bad slideshows and start fresh.
“Did you happen to use your digital still camera in movie mode?” At one point I downloaded a movie off of my digital camera into iPHOTO.
“Is it possible you are looking at the QT player window and not iMOVIE? No, when I open iMOVIE and select “Open an existing project” all of my imported slideshows from iPHOTO to iDVD are sitting in iMOVIE.
Can I delete all of these bad slideshows and start fresh? I’m having to come up with new slideshow names every time the slideshow DVD-R burning process does not work.
It takes alot of time to sit and wait for the Apple help line people. I actually bought a telephone headset because of this problem. I really just want to figure out how to do this the right way and stop wasting so much time.
Thanks for your time and interest!
Kristen
Ibook G5 Mac OS X (10.4.8)
Ibook G5 Mac OS X (10.4.8)

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