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Here are several clips I shot using the 50D with Magic Lantern.  Lens is the cheap 80-200mm.  First two clips of the orchid were done at f5.6 , 1/30th, 800 ISO.  Due to stormy weather build up I had to increase the ISO to 1600 on all clips after that.  Card is an 800x 120MB/s San Disk Extreme.  Write rates stayed around 60MB/s

Most images are done at full zoom at 200mm, but the real close ups are done using the 5x crop mode.  I  shot 15-30 second clips continuously for about 30 minutes, but recording was being stopped and started.  During a previous test indoors I was able to shoot in excess of 6 minutes continuous until overheat shut down the camera, which I was expecting around the 4 minute mark.

Most clips were shot as the rain and wind were building up pretty good.  Mediocre avail light, due to heavy cloud covering.

Images were converted to dng, then run through Darktable in Linux to modify the files. Only real modifications done were using profiled noise reduction, very small increase in brightness.  Darktable then exported all images to 16bit TIF format for rendering.  Final render was done in Vegas Pro 10 64 in Win7 at 29.9 at 1920x1080p.

Computer is a DIY, 8 core AMD FX 8350, water-cooled, OC to 4.7GHz, with additional external fans.  32 GB DDR3, 120 GB San Disk SSD for rendering.  Total of 12 TB storage.  Took just over 2 minutes to render, a minute or two for Darktable to profile each set of images, perhaps 30 seconds to convert to dng.  Took way more time to switch between Ubuntu and Windows.  Yes, I could have used my VB install to make this seamless, but I wanted to do a full run test for myself.

Yes, I have some hot pixels I did not bother cleaning and I wasn't real careful in modifying files.  With that said, the images are pretty darn good for a camera that was never designed to shoot video, much less raw.

dave

Camera:  550d;  Canon Firmware: 1.0.9;  16GB SanDisk Extreme SD HCI  30MB/s; Canon 50mm f1.8 lens; Ambient Temp  32c

In this test I wanted to see how dialing down the FPS in movie mode, using FPS Override, worked.  Shot was done in a covered porch, each shot starting immediately after the previous ended.  All camera controls set to Manual.  Shoots were done to create approx. 10 seconds of finished video for each test.

Tests #1-#4: Aperture, Shutter speed and ISO all same (f18; 1250; 100)
FPS Override as follows:
Test #1:  3 FPS, 100 second shoot
Test #2:  2 FPS, 150 second shoot
Test #3:  1 FPS, 300 second shoot
Test #4:  0.5 FPS, 600 second shoot

During the test shoots, it is obvious that exposure becomes more and more over exposed as fps rate drops. 

Test #5 changed exposure parameters from #4, but almost to a reverse view as it seemed that where it should have gotten darker, the shot got even lighter.

Test #5 :  Aperture f22,  Shutter 4000,  ISO 100
Camera overheated at about 4 minutes shooting time (4 seconds movie time) and required shut down.  This may be only due to high outside temp, even though shooting in shade.

Main concern is that when using slow fps, trying to focus, set exposures are very difficult due to view delay in Live View.  Not certain why over-exposed.

Been using ML now for about 9 months.  Have it on T1i, T2i, T3i and 60D.  Love the features, love the innovation, love the idea, love the community!

dave