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Working on 10-12bit 1:1 on 5D2 , as we know 3x crop works with 10 & 12 bit reduction but not 1:1 really well .
Thou in 12bit 1:1 you can record with corruption on every other frame on the top 100 or so lines .
I'm currently seeing the feasible of using bit reduction in a up coming documentary I been hired to shoot in 2 weeks for the sierra club (usa)
My needs are long shoot times , so low bite rate fits the bill .
Here a list of resolution's size I was possibly thinking of using with 12bit in 1:1 (as there corruption on the top of frame)
with the adjusted crop to remove corruption. I also listed the file size for 60 second or so to get max time for minimum card space
The base line is 14 bit 1856x928 23.976 fps (My minimum spec. for HD broadcast as it need to be up upscaled)

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1856x928  23.976 14bit 59.9 seconds 1437 frames 4.05 GB 1:1 Liveview  ( 2:1 A.R.)

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1856x1114 23.976 12bit 64.8 seconds 1554 frames 4.51 GB (crop adjust 1856x988) 126 line crop 1.878542510121457 A.R.
1856x1044 23.976 12bit 64.8 seconds 1554 frames 4.23 GB (Crop Adjust 1856x953) 91 line crop  1.947534102833158 A.R.
1856x1004 23.976 12bit 60.3 seconds 1447 frames 3.78 GB (crop Adjust 1856x932) 72 lines crop 1.991416309012876 A.R.
1856x928  23.976 12bit 60.1 seconds 1442 frames 3.49 GB (crop adjust 1856x895) 33 lines crop 2.073743016759777 A.R.   

So There is really no saving after cropping , but 3x crop mode is a different matter all together .
Here 10bit really save me , as I can have to 20min per 64GB Card @ 1920x1076 @ 23.976fps
Thou the field of view is reduced , looks like the 24mm will gets a work out 

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1920x1076 23.976 10bit 59.9 seconds 1437 frames 3.47 GB  (3x Crop Mode)  1.784386617100372 A.R.
So I save about 500 MB per minute which will add up fast. 4x 64gb card should be around 80 min's of 10bit 2K or 1920x1076.
Now I can use my slower 60MB/s CF cards to get

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1856x928 23.976  10bit 60.1 seconds 1443 frames 2.91 GB  (3x crop)  (2:1  A.R.)

It looks like I'll being shooting in 10bit 3x crop for this doc.

Now for the real reason I started this post , as I said I'm work on 1:1 liveview 5d2 10-12bit.
I've being working on older code with .raw , just to keep it as simple as possible before I move on to .mlv full & mlv_lite.
At this Point I can record 10bit & 12bit , with out any lockups or screen freezes all overlays are working while recording bit reduction.
When not in bit reduction it return to 14bit and of course it work without problems.

Now the Problem  there is always a problem , my issue is decoding the .raw to  dngs
My question is can I convert the .raw to .mlv ? as mlv_dump seem not to understand .raw
I'm currently uploading some of the .raw file to my Google drive to share , when done I'll post the links.

I couldn't get the 7d to work without freezing the liveview. So I bought a used 5d2 and spent last evening modifying and compiling the code on a trial and error. I can now get no corruption consistently by disabling the double buffer, but there's a bit of image shifting appearing at the top part from the previous frame.

Did you follow my guide exactly? When it does freeze do this:

Go back to Overlay menu, enable Global Draw again, return to Liveview 5x zoom, go back again and disable Global Draw, return to Liveview one last time, hit record and you will again be able to view what you are recording.

Thanks again. There's something odd, I tried your step by step instructions and it still freezes. Do you have any other special settings on ML?

7D Users,

I played around with the 10/12bit Magic Lantern build for 7D found here: https://bitbucket.org/reddeercity/magic-lantern_10-12bit/downloads/magiclantern-10bit_12bit_raw_twk_crop_rec.2016Dec01.7D203.zip
I was shocked when I managed over 2min of continuous 2520x1200 video @ 24fps with working Liveview and in camera playback! I used a Lexar 64GB 1066x card.

Here's a guide for noobs like myself who wish to try it out.

-In Modules menu enable mlv_play.mo, raw_rec.mo and raw_twk.mo.
-In Movie menu set FPS override to 24 FPS Exact.
-Enable RAW video and set Bit depth to 10, return to Liveview and do 5x zoom, return to Movie menu set resolution to 2520x1200,
-In Overlay menu set Global Draw to OFF, return to Liveview in 5x zoom
-Hit record!

When the camera is turned off and in some other situations when you attempt to record in 5x zoom mode Liveview will freeze. Go back to Overlay menu, enable Global Draw again, return to Liveview 5x zoom, go back again and disable Global Draw, return to Liveview one last time, hit record and you will again be able to view what you are recording.

Most of the time I get around 1min40sec of continuous 2.5k video

Edit: I've noticed there's a few of pixles in the bottom right corner of video that do strange things..

Thanks tonij, I followed your step by step instructions and I manage to record in 10 bit successfully on my 7d. However, no matter what I do the liveview always freezes. How did you manage to see what you're recording?