Raw Video on Canon EOS-M using Magic Lantern

Dec. 16, 2013, 5:41 a.m.

After getting an EOS-M, my first step was to put the latest Magic Lantern alpha on it to get the audio meters and exposure tools (zebras, rec picture style) that I'm used to on other Canon DSLRs with ML.  A cool feature of the EOS-M though, is a faster SD card write (up to 40 MB/s) so that raw video is possible up to 1280x720. A pretty good guide to raw on the eos-m already exists (http://www.magiclantern.fm/forum/index.php?topic=8825.0), but I'd just like to put my workflow and experiences here. Camera settings: I use video mode, with crop mode turned on.  This gives about a 3x zoom, but gets rid of moire and aliasing.

Shooting 720 further crops the image, so I recommend using a tripod and wide lens (the built in 22mm turns into 100mm or so).  Make sure to turn on global draw for RAW so that ML will draw a box showing you the framing for your raw crop. Post Workflow: I start by running all the files through the focus pixel fixer from the guide above since eos-m and t4i have focus pixels that need to be interpolated around.

Then I run the new focus pixel corrected raw files through raw2cdng (http://www.phreekz.de/wordpress/2013/06/magiclantern-raw2cdng-cinema-dng/) with partymode on and set to around 1.1 gamma. This will generate Cinema DNG sequences that you can then import into Premiere Pro CC directly by choosing import and selecting the first DNG in the sequence.  The new direct link to speedgrade lets you create your edit in Premiere with native DNG sequences and finish your grade in SG with no transcoding.  The raw files do seem to have more dynamic range and highlight recovery compared to h264, but I'm not sure if Adobe is completely handling the cDNGs properly.

Caveats: 100% clipped highlights show as magenta in premiere, but not in adobe camera raw.  The only workaround I have found is not to clip anything.  More things should be automated by scripts, the focus pixel fixer and importing cDNGs in premiere is all one at a time and a pain.  File sizes are huge (8GB for a couple minutes of footage around the house).  Files occasionally have a frame or two out of order (this may just be due to not having a fast enough card).

  • ML for the EOS M is back in the nightlies: http://www.magiclantern.fm/forum/index.php?topic=9741.msg93694
    jordancolburn - Dec. 30, 2013, 5:11 p.m.
  • I haven't done much other than move the code needed for it to work with the 2.02 firmware update, but all the basic ML functions work for me. I'm working with a1ex to get it into the nightly builds. He seems worried that nobody will use it compared to TL so it will be a waste of time, but without feedback from it being in the nightlies, I'm not sure how I will know what features/bug fixes are most important to people. I'll comment here and in the forums once a nightly build is available again.
    jordancolburn - Dec. 30, 2013, 4:10 a.m.
  • hi, i've seen in magic lantern forum that you are going to port the tragic lantern into the official magic lantern on eos-M. Is there any nightly build for magic lantern on eos-m? coz i couldn't find it in the official website.
    Aizan Abd - Dec. 29, 2013, 11:52 p.m.
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