Hello, I recently shot some footage using the 5dm2. I created a subfolder while filming to keep my clips organized (I was filming a different scene) I had the original folder 100EOS5D, and the subfolder I created within the camera 101EOS5D.
Anway, some important files are having the following error show up: the clips could not opened an I/O error occurred.

Has anyone ever experienced this? Hopefully there's a way to repair the QT files. I've never have had this happen until now. I'm never gonna put my footage in a new folder ever again while filming... Thanks, everyone.

Are you trying to open them directly from the CF card? That's never a good idea. If so, copy them to your hard drive first, them open them. It might work better.