Alright, got the latest 5D3 magic lantern files in there and it's all looking good now. Great to see the rapid pace of development!
I'm having a bit of trouble, likely expected with these cutting edge builds. I'd love to have magic zoom but remove the text on the screen that tells me the names of the two files that are being written, as it's covering at least 20% of the video with those names and bitrates. All I want to see is magic zoom and a timer telling me the length of the recording. Haven't discovered the right option though I've explored every possible menu as far as I can tell.
I'm finding that if I set for spanning, I can only record about 10 seconds of 1080p23.976 raw video before it skips a frame and stops. But if I turn off spanning it records continuously just fine. Maybe it's due to the speed (or lack thereof) of my SD card? My CF is a Komputerbay 1050X 128Gb that's been working great for 1080p23.976 canon raw for the past couple of months.
One feature idea: I record second system audio using a r0de videomic plugged into a zoom H1. A pretty cheap, nice=sounding combo. It'd be neat if the camera had a way of outputting a series of beeps at the start of recording that would identify the name of the filename to which the audio recording would belong. Morse code perhaps? Maybe the name of the clip in morse over the first couple of seconds of the clip and then a beep that coincides with the exact frame on the 3 second mark to use to sync? Or a beep that coincides with a little dot in the corner of the frame, fire the flash, darken the frame, something that can be used visually to line up with the beep. Anyway, just throwing that out there in case it makes sense to anyone (or in case it's already in there and I haven't noticed).