Messages

Hi, I'm using a 5D Mark III with an Ikan VK7i via HDMI and shooting H.264 for this tests.

I used to trust the Magic Lantern histogram when using an external monitor until I realized the histogram was not real: it underexposes the histogram by 2-3 stops, again, the histogram is underexposed, not the image, which then is overexposed by 2-3 stops.
Is that normal? What is causing the problem? For this specific test I was not using the RAW histogram since I'm shooting H.264.

Here's a quick test. The image is actually not showing in the screenshot, but the scene was even except for a white cloth, which size was about 20% of the scene.
- Screen capture when using the monitor. Pretty good exposure, huh? Looking at the image (which is not showing in the screenshot), the white cloth looked overexposed, but the histogram didn't say that. I trusted the histogram to set the exposure.


- Screen capture when using only the camera: I simply turned off the monitor, I didn't changed any exposure values, as you can see. This is the actual image that would be recorded (the image is not showing in the screenshot, just look at the histogram). It's clearly overexposed by 2-3 stops, and the white cloth is clearly blown (I tell you that).


Then I guess I have to set the exposure using the camera and then turn on the monitor and don't look at that false histogram again.

Any tips?

I'm confused. The 5DMIII as standard (without ML) can output 60fps H264 on a 720p resolution. Isn't this what is being talked about? I need some clarity to settle my mind on this one.

I meant H264 1080p 50 or 60fps, I don't know what he referred to. Sorry about that. H264 720p at 60fps is possible even without ML as you say 

Double checking - I currently use ML 1.1.3 for serious video use as in work for clients. In this case, should I hold off from upgrade from my current firmware "1.1.13-ml-v2.3.NEXT" for now or should I really jump on this firmware 1.2.3 without hesitation? Love to have more input on this..

This is what I meant. I'll be waiting a few days.

60fps H264? Couldn't this be done anyway? Maybe elaboration is needed.

That's not possible as far as I know.

albertgarciarue: did you get pink frames on 1.1.3 with latest builds? I don't see your voice here: www.magiclantern.fm/forum/index.php?topic=10443

No, I didn't although I don't know any about builds or nightly builds as I only have installed ML once and as all I needed was working perfectly I didn't touch it (5D3 mainly using H264 and raw video). So I don't know what build I have installed. I'd like to know more about this but I'm a bit lost.

Thank you for your exellent work. Then I'll be trying 1.2.3 really soon.

[for serious video use, please consider staying on 1.1.3]

- watch out for corrupted frames (from my limited testing, I'm not fully convinced the issue is fully resolved on 1.2.3 => for serious video use, please consider staying on 1.1.3)

So, if we're mainly using the Mark III for H264 and RAW video, you recommend to stay on 1.1.3 because of the corrupted frames, or it shoudn't happen? Will it be the same as 1.1.3 or worse?