FPS drops when recording video I have a DSLR camera which can record a HD movie at 60fps. My question is that, sometimes when recording, the FPS seems to drop below 60fps. What caused this problem? I used a class 10/UHS-1 SD card with transfer rate up to 45MB/s.
Are you sure it's dropping frames? I have a canon 5d and it never drops frames, it simply stops recording when it can't keep up. 

My guess is the file is fine, but the preview on the LCD is dropping frames.