Author Topic: Updated MLVFS supporting Canon HW compressed MLVs  (Read 12306 times)

The_bald_guy

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Re: Updated MLVFS supporting Canon HW compressed MLVs
« Reply #75 on: November 18, 2017, 09:22:35 PM »
I used the latest 2017-10-16magiclantern-crop_rec_4k firmware in 14bit lossless at 23.976fps 50th/sec on Komputerbay 128gig cards. I would get some crash on audio recording from the canon UI every once in a while, but we made it thought the shoot.

bouncyball

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Re: Updated MLVFS supporting Canon HW compressed MLVs
« Reply #76 on: November 19, 2017, 09:27:06 AM »
Well, a1ex's comprehensive answer is a top notch as usual :)

a1ex

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Re: Updated MLVFS supporting Canon HW compressed MLVs
« Reply #77 on: November 19, 2017, 03:42:39 PM »
Got some half-decent results with this: https://github.com/pathak22/pyflow

For each frame:
- selected a few nearby frames (choice not critical, e.g. i-3 ... i+3 is fine, but some difficult frames will need more)
- computed a warped version from the nearby frames, using their demo script (only changed the file names)
- averaged the current frame and its warped versions => a temporally denoised frame
- from the difference image (denoised - original), kept only the vertical pattern (column medians) and discarded the rest

Seems to work as long as the camera is moved horizontally (otherwise it's hard to tell the difference between pattern noise and vertical objects in the image). When the camera motion stops, the pattern reappears (need to pick different frames).

Can you upload a few frames before and after your test image, graded in the same way? 15 JPEGs before and 15 after should be fine, just to run a quick test and have something to compare with. I've got this, but it's hard to judge when they don't have the same grading.

All in

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Re: Updated MLVFS supporting Canon HW compressed MLVs
« Reply #78 on: December 14, 2017, 12:43:54 AM »
Hello!  This is my first post, although i'm not really that new to ML. In the first place,  I wanna' thank you all for what you are doing for me,  for Canon,  for everyone :). On the second place,  I bumped into a problem. I recorded some compressed mlvs, about 150 with my 700d, spread on 3 sd cards,  in 600d's crop mode. The problem is that i know how to work with mlvfs,  the old one,  but this one gives me dngs for just one or two mlvs, and the rest of the folders from the virtual drive are empty. The webgui sees their names, but with no info,  no preview. The resolution used is 1600x900. The Mlvs are not corrupt,  because i can work with them in mlvp, but for such number of files I would prefeer the mlvfs workflow.  I could use your help  :). Thanks!

bouncyball

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Re: Updated MLVFS supporting Canon HW compressed MLVs
« Reply #79 on: December 14, 2017, 09:26:52 AM »
Coud you upload somewhere smaller file which is not showing in preview of webgui?

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Re: Updated MLVFS supporting Canon HW compressed MLVs
« Reply #80 on: December 14, 2017, 11:49:48 AM »
Thank you and sorry for wasting your time,  I eventually found out what was causing the problem. It was the file "fseventsd" which was on the card. It took me several hours to become smarter than a rock, but I did it  :D . Now it works just like before,  maybe a tad slower. Thank you again.  Have a great day!

bouncyball

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Re: Updated MLVFS supporting Canon HW compressed MLVs
« Reply #81 on: December 14, 2017, 06:40:46 PM »
Hm... what is that file?

Walter Schulz

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Re: Updated MLVFS supporting Canon HW compressed MLVs
« Reply #82 on: December 14, 2017, 06:46:49 PM »
Directory. A gift from macOS/OS X.

bouncyball

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Re: Updated MLVFS supporting Canon HW compressed MLVs
« Reply #83 on: December 15, 2017, 12:14:16 PM »
Ah :) understood.