So when I export my HD clips from EyeTv3 using the format H.264 and play them back on VLC they're fine. No jitter at all, perfect. Then I import my clip from my desktop to iMovie (Not optimising the video), again it's fine, no jitter. Then I export my movie by clicking "Share, export movie, I choose HD, and I look at what it is and it says it's 'H.264, 25 FPS, 10 Mbps" but in EyeTv3 my settings are 13.5 Mbps and 59.94 fps." I don't know if this effects it? But after I've exported my clip has this jitter. I think I have to change some settings in iMovie because everything is fine until iMovie, PLEASE HELP.