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Topics - DigitalVeil

#1
I'm curious if it's at all possible to write raw video files out through a camera's USB port directly onto something like a USB flash drive, something like having the EDMAC copy the sensor readout to the USB controller instead of the SD controller.  Of course, all current ML-supported cameras have USB 2.0 or slower, which in real-world situations tops out around 20MB/s, so this feature would only be practical if it were possible to dual-write to both the SD/CF and USB port at the same time (same way the 5D3 can dual-write to both CF+SD at the same time).

I know this idea has been kicked around here from time to time (like here: http://www.magiclantern.fm/forum/index.php?topic=6128.msg57345#msg57345) but it's never really been seriously pursued.

If this could be done, it could provide a pretty significant boost to all cameras (at least 2.0 models) in terms of raw recording capabilities.  Cameras like the 650D, 700D, 70D, and EOS-M could theoretically write up to ~60MB/s.
#2
Feature Requests / Video crop mode: adjust crop factor?
January 05, 2015, 07:03:42 PM
Currently, crop mode is just limited to "on" and "off" and the only option is 3x crop.  Would it be at all possible to set custom crop factors, like 1.5x, 2.5x, etc?  If possible, I feel this would be a useful feature.
#3
Feature Requests / Request: h264 GOP control in ML
January 05, 2015, 06:30:00 PM
Before bit rate control was merged from TL back into the unified ML branch, it was possible to adjust more individual parameters like slice and GOP.  Slice is now part of 'Qscale' but unfortunately the ability to change GOP has been removed.  It would be really nice if GOP control could be brought back in ML for at least the TL-supported cameras that originally had it, and possibly others as well.
#4
Share Your Videos / First video made with ML (700D)
January 03, 2015, 10:28:03 PM
Last week I finally got around to putting ML on my 700D, and I shot a simple, quick promo video for a friend who just started his own recording studio and produces beats.  I mostly made this video to both test out the new 24mm f/2.8 prime lens, to experiment with slow motion and Twixtor, and to familiarize myself with ML and see what I could do with some of its features.  It was also just made for a bit of fun.

This was shot on Canon's recently-released 24mm f/2.8 STM pancake prime lens (STM AF left off, I only have it on when using it with my 70D).  Slow motion clips were shot at 720p 60fps with bit rate set to 3.0x CBR (~130Mbps), stretched by 250% from 60fps to 24fps, then stretched another 200% to interpolated 12fps using Twixtor to ultimately achieve 5x slow down.  Unfortunately the Twixtor effect had to be removed from certain frames due to some awful warping, and there are other areas where I chose to keep smaller warping artifacts for the sake of preserving smooth motion.  I ignored the 180d rule and left shutter speed at 1/60 as I wanted more motion blur.  The last clip was shot raw at 1280x720 24fps, mostly just to learn the raw workflow.  Noise was cleaned up with Neat Video, with slight sharpening applied on top of that.  All post work, including basic color grading, was done between After Effects and Premiere Pro.

Ultimately I learned that Twixtor should only be used for very short segments and it can't really be relied on for applying to whole clips.  I thought about overcranking to 70fps and stretching to 30fps, but setting 65fps and 70fps still resulted in 59.94fps, and I don't know enough about FPS override to mess around with the advanced parameters.  I also could not get exact 60fps like I wanted, and 59.94 doesn't go into 23.976 as neatly as 60 into 24, which may have cause some slight judder.  In addition, the 700D is limited to IPB compression, and I think the difference between IPB and All-I is magnified with slow motion.

Anyway, here it is, hope you enjoy!

#5
General Help Q&A / Questions about Bit Rate Control
December 31, 2014, 09:16:18 PM
I've got a few questions about using and understanding bit rate control in ML.

1. What exactly does Qscale do? Is it the same thing as "slice control" from Tragic Lantern? Does it change any other parameters?
2. Does BR control in ML adjust the GOP value at all? Is it even possible to record All-I on cameras that are normally limited to IPB?
3. Regarding the bit rate info overlay, there are 4 boxes.  Obviously A and B are pretty easy to understand, but I don't understand the green box (has a variable percentage) or the red box (always says Q+-1).  Could someone explain to me what these 2 boxes refer to?
4. Just out of curiosity - why is CBR limited to 3.0? Is there a limitation with the hardware or the encoder? Or is this just for user-friendliness? I'd love to see what 300Mbps would look like on these cameras.