To get Avid Media Composer work well with MP4 / MOV videos, you can follow this video to transcode MP4 / MOV to Avid MC Native-Formats - DNxHD - ensuring maximum editing quality and efficiency when working with Avid Media Composer.
Official Guide(More details here): http://www.pavtube.com/import-mp4-mov-in-avid.html
Pavtube Video Converter: http://www.pavtube.com/video_converter/
Pavtube Video Converter for Mac: http://www.pavtube.com/video-converter-mac/
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