I have this issue. Using nov 15, 2015 build for 5dmk3. Firmware 113.
Shooting basic raw video format.
If I set camera to 30fps, everything comes out fine using photoshop and media encoder to 30 fps.
If I set camera to 24fps, doing exact same thing but media encoding to 24fps. The video come out accelerated. I have to change speed to 80 % for timing to be correct.
And no , I do not have fps over ride on when this happens.
I tried fps over ride set to 24fps with camera set to 30, and I get exact same issue.
I tried different 24fps formats in media encoder. Still same issue.
Maybe my camera is broke in some way!? What do you think? Thanks