It is a Samsung Camera.
I am not aware that I should optimize my media! I am new apple iMovie user and purchased my 27inch i5 machine 2 weeks ago. Please tell me how and when do I go about to optimizing my media!
I initially also experienced a problem with the sequence of my clips when importing it onto the imovie timeline. The clips were all imported backward and not according to the date/time! I resolved this problem through a simple conversion.