TTGator wrote in post #16979688
Yes, it's 30 min or 4GB, whichever comes first. Magic Lantern will automatically restart recording for you when you hit this limit. A couple seconds will be lost between that automatic stop and restart.
The 5D Mark III does not stop recording at the 4GB mark. The 5D Mark II did, but the 5D Mark III does not.
The 5D Mark III instead closes the current file and starts writing to a new file, with no frame loss. When you insert these two clips adjacent in your editor's timeline, they will play back as if they were one clip.
Both the 5D Mark II and the 5D Mark III stop recording after 29:59. When I am filming plays, I do a quick stop/start cycle during scene breaks, well before the limit is reached.
The only way around this limit on DSLR video is an external HDMI recorder such as the Atomos Ninja.