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Messages - reziarfg

#1
Just in: Cameramemoryspeed.com has their numbers on the 80D

It's just slightly faster than the 7d mark II which is great news.
http://www.cameramemoryspeed.com/canon-80d/sd-card-comparison/

Since they report "avg write speeds" we'll just call that sustained. Making some liberal assumptions, this puts theoretical RAW video performance at around the original 7D (which is quite good!)
Here is the comparison chart from elsewhere on this forum for drawing conclusions:
https://docs.google.com/spreadsheets/d/16cgnRivbUv7nA9PUlCLmLdir3gXdIN3pqzCNAAybepc/edit#gid=5
Relevant thread:
http://www.magiclantern.fm/forum/index.php?topic=6215.0
#2
Quote from: Malakai on May 16, 2016, 05:55:18 PM
Just checked the video files from my 80D and it looks like the video bitrate peaks at about 92mbps, the 70D is about 42mbps. Would we have to take into account the buffer too?
Canon recommend using a UHS3 card for video to cope with the higher bitrates.
Based on this, I would hazard a guess that the 80D is twice (if not a bit more) as fast as the 70D in terms of writing to the card.
92mbps? That's only 11.5MB/s so I don't know if it's relevant in terms of max write speeds. Since video recording is often measured in mbps and not MBps it's an important distinction.


Quote from: Greg on May 16, 2016, 07:52:59 PM
http://www.cameramemoryspeed.com/canon-t6s-t6i/sd-card-comparison/

760D write speed - 75MB/s
80D RAM - 1024MB ?
(20 x 24MPx = 800MB)

This is really cool. The t6s wasn't there when I did my test and since the 80D falls between T6s and 7D MK II in terms of placement in Canon's lineup it stands to reason it's also capable of the same speeds. Unless for some reason they put a faster SD card controller in the T6s. But that seems unlikely. Looks like good news all around!
#3
I followed the instructions below to create a "$14 steadicam"
It's basically a bunch of metal pipes but it's solid and works well. I actually adapted an old tripod screwmount to the top to make it a little easier to work with.

You can get the parts at any home improvement store.

http://14dollarstabilizer.org/
#4
Thanks, I'm still pretty new to posting. Sorry for putting this in the wrong spot.

I just ran a test with a similar methodology as the one I linked in my above post (http://www.cameramemoryspeed.com/canon-7d-mark-ii/fastest-sd-cf-card-comparison/)
I ran a burst of RAW files(RAW only, no JPEG) in high speed mode with the lens cap on and manual focus engaged. I measured the time from when the red "activity" light was on until it turned off after the burst completed. Note that I stopped capturing images before the buffer filled each time so the capture rate doesn't slow down.

I ran a few tests with somewhat mixed results. If anyone can make any recommendations on improving my process, I'm open for suggestions.
RAW file size is consistent at 22.0MB per image It looks like the RAW file gets bigger and results get worse as ISO goes up. I guess this makes sense? For the sake of this test I manually set ISO to 100, F2.8, 1/200 shutter speed.

Test 1:

  • 17 images
  • 6.28 seconds from start to activity light off
  • 374MB total captured
  • 59.55MB/s avg write speed

Test 2:

  • 17 images
  • 6.06 seconds from start to activity light off
  • 374MB total captured
  • 61.7MB/s avg write speed

Test 3:

  • 25 images
  • 8.33 seconds from start to activity light off
  • 550MB total captured
  • 66MB/s avg write speed

Test 4:

  • 30 images
  • 9.81 seconds from start to activity light off
  • 660MB total captured
  • 67.28MB/s avg write speed

I feel like it's already been pretty well established, but If anyone's got a 70D and a sufficiently fast card and wants to try out the same test I'd be interested to see the results.
It looks like these results are slower than the ones published for the 7D MK II in my linked benchmark. But I can't say for sure if that ~10MB/s difference is a result of my testing process being flawed or a hardware difference.
#5
Hi all,
As it stands I know the 80D may be a long way from ML support, and I hope this post doesn't breach any rules, but I thought we could do some basic theory-crafting on its hardware capabilities.
Here's what my research has uncovered so far based on internet benchmarks and existing ML implementations for other cameras:


I do have an 80D and Sandisk Extreme Pro 95MB/s UHS-I SD card. If anyone knows how I can run an effective benchmark I'll give it a try. I plan on attempting to simply time how many RAW files I can write in a certain burst duration and do some math on how many MB/s it's writing. Not sure how well this will turn out.
#6
So I did try the Canon pixel remapping around the same time I was troubleshooting this issue. It came up when I was looking online for solutions. It had no effect on raw video. My guess is that ML's raw video doesn't get processed by Canon in any way. Since it's "raw" the mapping doesn't take effect.
This would also explain why it doesn't show up in Canon video and stills.

Thanks for the suggestion though.
#7
FYI guys and to anyone else who might be experiencing a particularly stubborn dead pixel. I found a somewhat acceptable solution. It's not perfect, but you can use AE's CC Simple Wire Removal tool to "mask" out the dot.
I'll have to do some more testing, but it seems at least somewhat effective.
Here's a video demonstrating the fix:




And here is the result of my attempt on the same dark grainy video. Probably a poor example but I'll play with it a bit more in the future.


I don't know why my youtube videos upload terribly when I'm saving in H.264 in HD at a high bitrate...Should still give you an idea.
#8
Hmmm. I think I know what you're talking about. It actually automatically processes in ACR giving me options for WB, etc. But it doesn't remove that dot. I think it's the perfect storm of exactly the dead pixels that ACR can't remove. I tried Photoshop as well and it appears there when opening the DNGs.

My guess is it doesn't appear in my Non-ML stills because of Canon's own pixel remapping which doesn't happen when doing raw capture.
It is there in live-view silent capture ML as well. Probably because it's a raw read of the sensor too?
#9
I did try MLRawViewer. It plays the video and shows the same very hot pixel in the center area. It's just so blatantly there! Agh!
I took a look in http://rawtherapee.com/ at the stills and zoomed in in non-demosaic view. It looks like I've got two stuck green pixels and maybe one stuck red pixel all clustered together. I'm not sure there's a resolution. None of the stuck/dead pixel fixers I've tried can fix it. It's just too big. Doesn't show up in non-ML stills and video though so I guess Canon's baked-in pixel remapping has a bit more gumption.

Thanks for the suggestion though.
#10
I'm using MLV Converter 1.9.2 although I did try with latest version of raw2cdng (1.6.5?) and see the same issue. :(

I did try to convert it without Chroma smoothing and will say that it looks much more like some sort of pixel. Still not sure why it's white though. I've never seen a stuck white pixel.
Below is a youtube video of what it looks like converted without chroma smoothing(recommend viewing in HD):



EDIT: I don't know why, but Youtube's conversion made the video kind of mucky. Anyway, you can still see the white dot. It's there 100% of the time.
#11
Thanks for all your help/suggestions.
I was originally using a Canon 10-22 lens zoomed all the way out to play around with my widest FOV in crop mode. It was most apparent here.
When I'm not using crop mode it's less apparent. Unfortunately, I'm at work now so I can't give you too many settings details except I was in 1280x720 resolution in crop mode.

It does look like I can actually see it in the preview as well. Below is another Youtube video demonstrating this. It looks like it's red or sometimes blue looking in the preview but always white in the final output. So maybe it is a stuck pixel after all and somewhere in the process it's being made white. I wonder if it's the chroma smoothing from MLV converter. When I get home I'll try again without that setting and see if it's still white or if it's a colorful dot.

#12
When taking a normal video using a card without ML I don't see it at all. Then again, the video is pretty mushy comparatively and who knows what Canon's software is doing to it as it's encoded. So I'm not terribly surprised.

The fact that I don't see it in RAW stills might just be a result of ACR removing something. I bet I could find something if I could see the raw bayer array data. I'm guessing it is in fact something on the sensor.
#13
I've never known dead pixels to come up white. Aren't they usually RGB or black? It looks like it's doing the same thing with other cards as well.
I tried again without crop mode and it's less apparent, probably because it's not at a 1:1 pixel ratio(I think that's how it works, right?)

Regardless, it's really distracting and makes the footage useless. I've looked through the forums on stuck pixel removal and it doesn't seem like there's an easy way to handle it. But that's mostly because the pixels jump around. I wonder if there's a way to remove it when it's always in the same spot. Seems like it might be easier.
#14
I hope this is the right place for this. I searched the forum but couldn't find this exact issue.
I am seeing a strange artifact near the center of the frame which manifests as a bright white area of about 2 pixels. I don't see this in RAW stills or Canon video. Only RAW video.
Here is a video of what I'm talking about:

Happens in crop or regular recording mode.

Please disregard the noise as it's pretty dark in my room and I expect that. I'm talking about the specific and very obvious white artifact in the center area.
Below is the information for my setup:

Camera: 7D running 2.0.3
ML version: Nightly.2015Jan15.7D203 (although it's happened with previous versions)
Card: Lexar x1066 benched at around 90MB/s
Video resoluation doesn't seem to matter, but example is at 1280x720 I believe
Appears regardless of whether I use MLV Converter 1.9.2 or raw2cdng 1.6.5 to process the MLV file

If this is a case of dead/stuck pixel(s) it's the most obvious I've ever seen. Additionally, I took a look at the sensor and don't see anything obvious like dust/scratches.

Thanks for reading. It's my first post, really hope I'm doing it right. :)