“I record some video footage with my canon 600D, then I edit these video with iMovie, but when I import the T3i video to iMovie, the video is choppy and there are lags or skipped frames even when exported to 30fps.”
It’s clear that the Canon 600D (T3i) is an extremely well-featured little camera that’s well beyond the traditional stripped-down ‘entry level’ fare, and indeed gives little away in terms of features compared to the EOS 60D.
But H.264 MOV format is not good for editing in iMovie as the above importing problem. iMovie best format is AIC (Apple Intermediate Codec) MOV format, the favorite editing codec of iMovie in advance. The Apple Intermediate Codec (AIC) does not use temporal compression, so every frame can be decoded and displayed immediately without first decoding other frames. The drawback of this codec is that it requires much more bandwidth and hard drive storage space. The best way to edit EOS T3i MOV video in iMovie is to convert 600D MOV to AIC codec, you can follow the steps below.
Required Software:
Pavtube’s HD Video Converter for Mac - A top Canon H.264 MOV Converter for Mac
Step 1. Download and Run the best Mac Canon MOV to iMovie Converter and load H.264 MOV clips to it.You can click either “Add Video” button or “Add from folder” button to load source Canon T3i MOV files.|
Step 2. Click on “Format” and choose “iMovie > Apple Intermediate Codec (*.mov)”.
Step 3. Click “Convert” to start converting Canon T3i MOV to AIC .mov videos for iMovie.
After conversion click “Open” to find .mov videos.
Then launch iMovie, and then choose File > Import > Movies to import the converted .mov to iMovie for further editing.
So there you have it. Pretty simple! Now with this Canon MOV to AIC converter for iMovie, you can transcode your mov footage to iMovie under Mac easily and you will not have iMovie import and editing problems any more.
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Source: Best way to Import Canon T3i/600D MOV video into iMovie