.mp4 video imports but won't play/edit?

I'm trying to edit some .mp4 clips in my iMovie 11 and am having problems. They import fine, but when i try to edit them, play them, etc all I get is the audio but only the first frame of video. There's also a small yellow circle in the bottom left corner of the clip in the viewer.
Can anyone help? I'd like to edit and have playback.
I usually use GoPro helmet cameras but this video is from a more fancy HD camera.
thanks

mcchuch wrote:
There's also a small yellow circle in the bottom left corner of the clip in the viewer.
Does the small yellow circle have a number within it? The yellow symbol (with number) usually indicates that the clip's frame rate differs from the frame rate you've set for the Event or Project, normally either 30fps (NTSC) or 25fps (PAL).
You may have to import the clips again choosing a frame rate that matches your camera. If you can't select a matching frame rate, another option is to convert the mp4 files to another format. The free app MPEG Streamclip should be able to do this. Preferably, convert to Apple Intermediate Codec (AIC), otherwise H.264 format.
You can download MPEG Streamclip from the developer (Squared 5) here:
http://www.squared5.com/svideo/mpeg-streamclip-mac.html
John

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