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Messages - adrjork

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1
Shoot preparation / Re: Reduce Motion Blur in car-side-window shooting?
« on: September 17, 2019, 04:26:53 PM »
Hi Luther, thanks for your reply.

I shoot at 25 fps with Canon menu at 25 fps, and "also" FPS Override at 25 fps "Exact FPS" (I don't know if that gives any benefit...) And then I conform 25 fps to 24 fps in post (so the result is just a little-little bit slower).

1/48 shutter speed (in my case 1/50) seems too blurred to me (for this specific kind of shot). As I wrote, it seems to me that the best out-of-the-camera compromise is 1/64... But some doubt remains...

2
Shoot preparation / Reduce Motion Blur in car-side-window shooting?
« on: September 17, 2019, 05:02:05 AM »
Hi everyone,

I need to make some shots of trees, houses, etc. with a 4-axis gimbal, through the side window of a car running at 30-35 Km/h.
I made some test and I noticed that at T/50 the motion blur is really disturbing. I also tried T/84 and even T/100 and obviously this reduced the motion blur, but added the typical jerkiness of rapid shutter times.
Then I tried T/64 and I must say that to me this is the best compromise out of the camera.

Anyway, I also tried to handle the T/100 footage in Davinci: slowing it down a bit (20 fps), adding optical flow and just a little bit of motion blur. And the result seemed good to me.

My question: which one in your opinion gives the best result? Shooting at T/64 without touching it in post, or shooting at T/100 and then re-touching it in post?

Thanks a lot.

3
General Help Q&A / Changing ISO or aperture during a shot
« on: August 26, 2019, 11:45:42 PM »
Hi everyone,

I tried to change both aperture and ISO during a single shot. Changing aperture with the Quick Control Dial seems to be accepted: MagicLantern continues recording. Changing ISO with ISO button and Main Dial seems to give some little problem to MagicLantern.

Question: is it "safe" (for the file) changing aperture or ISO during the shot?

Thanks a lot.

4
Shoot preparation / Re: Night shot with 5D3 + ML, how to avoid noise?
« on: August 11, 2019, 12:33:13 AM »
Thanks a lot Danne.

5
Shoot preparation / Re: Night shot with 5D3 + ML, how to avoid noise?
« on: August 10, 2019, 10:29:55 AM »
About different exposure between MLV 2.0 and Lite 1.1, after several tests it never happened again. The first (and only) bad/strange result is really too heavy to upload it. My impression is that for some strange reason a gradual exposure transition function was activated (but I actually did nothing). Anyway, luckly all seems working normal now.

About white level discussions... I've found 151 topics (that I read...) here in the forum in which there is something about White/Black levels. Infos are too scattered. What would surely be useful (for me, but also for many newbies like me) will be a topic that sums up the discussion, or better a simple guide/tutorial/explanation about White/Black level. Perhaps this topic yet exist and I simply didn't find it, if so please someone link it here! (Thanks really a lot.)

What I've learnt is that 14-bit means 16384 values from black 0 to white 16383, in linear world. "Usable" range differs from camera to camera, and for 5D3 should be 2048-15000, where 2048 prevents color casting, and 15000 prevents purple fringing artifacts (and works well with highlight recovery in Davinci RAW tab).
Dmilligan says these values are not "adjustable"
but you could have to correct them when they are wrong (ExifTool, Switch, other ML tools) because "there is a correct (mathematically speaking) value for both of these". But this is math, because g3gg0 says you could try other values (1024, 1700, 1650 for black) "depending on what looks better".

The fact remains that my shots are not in 2048-15000 range: MLV App Info says 2046-16200 for 50% of my last tests and 2047-16200 for the other 50%. But I saw these values also HERE.
So here my questions:
1. Is 2047-16200 a correct range for 5D3 (or it's better to correct values to 2048-15000)? And if not, where does it come from?
2. Does it matter that some shots have 2046 instead?
3. In MLV 2.0 Rec module there si also the Fix Black Level to 2048 option. This makes me think that anything under 2048 is a wrong number. So, should I correct any shot of mine to 2048? (Via MLV App?)
4. Since black/white values are mathematically correct/incorrect, which is the method to calculate them for 5D3?
5. Switch let me change white to 15000/16383 only "if the tag is either 15000 or 16383 to begin with otherwise nothing will be changed to prevent other cameras to get these tags" (HERE), so does it mean that my 16200 is wrong? Perhaps because I'm using MLV Lite 1.1 instead of MLV 2.0?

(Guys, surely these questions are old stuff for you, but believe me it is not easy for me to navigate these waters.)

Thanks

6
Shoot preparation / Re: Night shot with 5D3 + ML, how to avoid noise?
« on: August 09, 2019, 01:43:42 PM »
Hi Danne, thanks for your reply.
What's wrong with posting the actual mlv_files? Much more effective.
Well, before annoying you too much it's better I repeat the test... Just to be sure.
Anyway, could you tell me that strange range 2047-16200? Is it an arbitrary assignment of the camera? Can I freely change it to 0-16838? Or 2047-16200 helps avoiding noise?

7
Shoot preparation / Re: Night shot with 5D3 + ML, how to avoid noise?
« on: August 09, 2019, 01:07:49 PM »
Thanks for your reply, Levas.
Could it be that you shoot in 12 bit lossless raw option ? Instead of standard 14 bit ?
No, MLV App Info says 14-bit for both, and exactly same ISO/Aperture/etc. for both, Levels for both are 2047 black, 16200 white.
Perhaps stupid question: why does black is not 0 and white is not 16383? (Should I set it manually? Or there is a meaning in those numbers?)

8
Shoot preparation / Re: Night shot with 5D3 + ML, how to avoid noise?
« on: August 08, 2019, 05:58:58 PM »
Sorry but... I've always used MLV Lite 1.1 instead of MLV 2.0, and today I tested MLV 2.0 for the first time. Now, same shutter speed, same aperture, same everything, then MLVFS and then Davinci... is it normal that MLV Lite file is brighter (minimum 1 stop) than MLV 2.0 file? ??? Possible?
Is it an "interpretation" of MLVFS? Or really is the file?

9
When working with them I use uncompressed MLV clips because of speed reasons
You use uncompressed MLV: in the sense that you use MLVFS to "virtualize" DNG on-the-fly, or in the sense that you don't convert to DNG at all?

10
Sorry for my basic-user questions:

1. I saw that in MLVFS workflow White level can be set at 15000 or 16383. In Davinci RAW tab there is an Highlight Recovery option. Is it the same thing as setting 15000/16383 in Switch, or the two things works together?

2. Switch give me both the options of rendering regular DNG, compressed DNG and on-the-fly DNG (via MLVFS). Is it possible that for playback speed in Davinci, the fastest option is regular rendered DNG over compressed DNG over MLVFS? And if so, is it possible that grading could be slightly different if applied to compressed DNG instead of regular DNG?

3. Believe me, I don't want make a SW-vs-SW challenge: I'm just curious to know which are the differences between compressing DNG with Switch and with SlimRAW (both are in this forum and both are loved by users, and both have a similar function, so I suppose both have great PROs and perhaps are useful in different situations).

Thanks a lot.

11
...sorry masc... I repeated the same question 2 times... I need some sleep...
2. If no error (e.g. by a bug) happens on transcoding, yes.
And it should be directly visible? (MlRawViewer can see compressed MLV, right?)

Anyway, which MLV workflow do you personally recommend?

12
Thanks a lot masc!
For a MLV you can easily do RAW Corrections (with some ML tools), for DNG you can't (yet, because of the lack of tools).
This is a very good reason to keep the MLV files. One doubt gone forever :)
Now, just few doubts remain to me:

1. LJ92 does "visually lossless" or "actually data lossless" compression of MLV and DNG? (Forgive me for inaccurate terms.)

2. Is safe storaging compress MLVs and deleting original MLV? (Can I always recover the original MLV from a compressed one?)

3. Is it better doing 14-bit DNG lossless compression with SlimRAW or with Switch-LJ92?

4. Lossless compressed 14-bit DNGs can somehow slowdown Davinci (in comparison with regular 14-bit DNG)?

5. Is it possible that MLVFS' on-the-fly DNGs slowdown Davinci (in comparison with rendered DNGs)?

Thanks really a lot.

13
Sorry if this question isn't new (I confess I've read 69 pages VERY rapidly, and all seems in progress still now):
Does MLVFS' on-the-fly DNGs slowdown a bit Davinci? Currently, do you actually recommend a deep color grading stable workflow with on-the-fly DNGs? Or is it still better (for quality of the grading and speed) working with rendered DNGs?

Thanks a lot.

14
Raw Video Postprocessing / Re: SlimRaw – CDNG compression tool
« on: August 07, 2019, 08:48:43 AM »
Hi, sorry if I re-open this old topic...
I've seen that also Swicth has an option for compressing DNGs (with LJ92) from MLVs, so which is the difference between compressing DNGs in Switch versus doing it with MLVFS+SlimRAW? (Believe me, as I wrote in another topic, I really don't want make a SW-vs-SW challenge: I'm just curious to know which are the differences between compressing DNG with Switch and with SlimRAW since both are in this forum and both are loved by users, and both have a similar function, so I suppose both have great PROs and perhaps are useful in different situations.)

And I confess I don't clearly understand if SlimRAW lossless compression methods is "visually lossless" or "data lossless", and if someone noticed any slowdown in Davinci playback with compressed DNGs (in comparison with regular DNGs).

Thanks a lot.

15
Shoot preparation / Re: Night shot with 5D3 + ML, how to avoid noise?
« on: August 07, 2019, 07:26:36 AM »
Thanks Walter, and sorry for my last dumb question  :-\
Long exposure noise reduction is applied to RAW, too but only if exposure time is 1 sec or longer.
And if my exposure is 1 sec or longer, is it advisable in-camera NR or better doing it in post?

16
Thanks Walter for your reply.
Lossless means lossless.
Well, sometimes lossless could mean "perceived quality lossless" that's not exactly reversible. This is one of my doubts.
Moreover, in the SlimRAW dedicated thread, yobarry asked "I read in this thread many users advising to keep the original MLV files, is this because later advances/improvements to programs such as MLVFS will increase the quality of the original CDNGs?"... And I share this doubt too.

Anyway, for compressing DNG files there is SlimRAW but also Switch has an option to compress DNG files with LJ92. Which is the difference between these two type of compression?
And the same Switch has a MLV compression option too! So the question is: in which case you recommend MLV compression over DNG compression with Switch over DNG compression with SlimRAW? Which one you prefer and why?

So, there are many similar workflows to obtain the same result: saving space in the RAID. I'd strongly like to know which are PROs and CONs of each one.

Thanks for your help.

17
Hi everyone, newbie here.
I'm facing the common problem of storage limits for MLV and cDNG files.
I read some topics in this forum about different methods/softwares, but there are a lot of informations all together and I can't understand which one matches my workflow better (that is strictly based on Davinci for color grading).
Up to now I converted all my 14-bit MLVs to 16-bit cDNGs with Switch, and then Davinci. I storaged MLVs for safety reason, and also cDNG for Davinci projects, and this means a LOT of storage... Too much for me.

Now, I've seen at least 3 different solutions for my storage problem:

1. MLVs to compressed MLVs via Switch (LJ92 option), then deleting original MLVs, then compressed MLVs to Davinci via MLVFS.
  • Q1: What do I actually lose compressing MLVs? Grading quality in Davinci somehow? Speed performance in Davinci?
  • Q2: Is it "safe" keeping only compressed MLVs? Could it happen that Switch introduces some error or similar?
2. MLVs to compressed DNGs via SlimRAW, then deleting original MLV, then Davinci.
  • Q3: What do I lose with "lossless compressed" DNGs against "full" DNGs? Again, grading quality or speed performance in Davinci?
  • Q4: Nobody in this forum recommend keeping only DNGs and deleting original MLVs, why?
3. Simply keeping original MLVs, then on-the-fly to Davinci via MLVFS.
  • Q5: MLVFS is on-the-fly, does it mean a slowdown in Davinci? And the grading is really as accurate as with rendered DNGs?
  • Q6: Is there some feature in MLVFS that is unaccurate in comparison with Switch?
Which is in your opinion the most "safe" and "high quality" solution? (Because – as someone else wrote in this forum – I have OCD for quality loss ;D and the word "lossless" is not reassuring to me...)

Thanks a lot for your help.

18
Shoot preparation / Re: Night shot with 5D3 + ML, how to avoid noise?
« on: August 07, 2019, 02:32:16 AM »
A detail: in Canon menu I deactivated all the Noise Reductions. I did so in order to apply Denoise only in post (to control it "manually").
Q: Do you think it's better to let the camera doing this automatically? And if so, which values?

Thanks

19
Shoot preparation / Re: Night shot with 5D3 + ML, how to avoid noise?
« on: August 07, 2019, 12:36:14 AM »
Thank you all for your very good advices!

Sounds like a lot of work, especially when there is lots of out of focus stuff in the foreground.
Well, perhaps, instead of masking only the lady (a lot of work indeed) I could mask the entire "corridor" of her walk (...perhaps...) and in this way avoiding all the transparency issues of the out-of-focus grass and stuff in front of me... We will see...

What software are you using for post process, or what is your workflow ?
Switch (for MLV to cDNG) + Davinci. That's it.

Another thing or 'trick' to consider, cut and lift the shadows, so all noisy dark parts of the frame become a noise free grey color.
Damn good!!! Thanks a lot for this trick!

i say buy a pair of cheap LED construction lights, add diffuse filters and gain +2 stops of light for your scene. Also buy some tiny LED flashlights and place them behind objects in the scene with some diffuse on and you can “fake” more light in the scene.
Eh... Not bad indeed! I'll try surely!

i believe that 3x3 readout has a cleaner output because of the interpolation, but slightly unsharper.
Then... I'm an idiot (damn me): all my shots are 5:3 (1920 X 1150) ONLY to have some reframing room in post... So, if I correctly understand, 1920X1080 gives me less noise thanks to the interpolation? (Honestly I tried this evening to shoot a semi-dark room both in 16:9 and 5:3, and the result was actually pretty similar...)

And stick to fps override and shutter fine tuning, always.
My English is very poor... "Stick to" means "don't touch"? (Again, I must be an idiot...) I've always keep FPS override activated, for all my shots... But always keeping the same fps ("exact") value of the Canon menu (25). Is it possible that I've made my shots worse somehow?

Edit: also look in to mlv app’s Darkframe subtraction, it does wonders when you go >1600 iso
Never used MLV App and I don't know what is darkframe subtraction... But Inoticed "darkframe average automation" in Switch.
Q: Is it the same thing? How does it work?

The color profile tells the raw what the range of color values to use and the noise is colors that are out of gamut
So, if I correctly understand, I could anyway take my shots in RAW and then converting them in Prores only when I find  some out-of-gamut artifacts (like too much noise). Or this operation must be done in-camera?

Again, thank you all a lot!

20
Shoot preparation / Re: Night shot with 5D3 + ML, how to avoid noise?
« on: August 06, 2019, 08:26:42 PM »
Thanks a lot for your reply Levas.

Also wondering, what noise are we talking about, is it mostly the grainy noise, or do you have vertical lines/banding noise, or do you have static, bright coloured pixels across the frame ?
Mainly grainy noise, but I noticed also vertical lines!

So I would definitely recommend your own suggestion of faking the shot, start shooting as soon the street lamps are on.
Yes, that was my first solution. But what about the second? (Compositing of sidewalk-timelapse + woman-normally-walking?) In this way only woman will be noisy. But what worries me is the fact that camera position is near ground and I see woman "through" a lot of out-of-focus grass and stuff, so I don't know if I will be able to make a realistic comp in post...

P.S. What about Override in your opinion? Any advantage in keeping it active at the same exact FPS (25) of Canon menu?

There is no difference in noise between shooting 16x9 or 3x2. You are shooting raw, the ratio only determines how much of the sensor raw data you want.
Is this true also between "normal" 16:9 and crop-zoom 5X? I mean, I can suppose that in 5X crop mode the amount of light is reduced, then I should have more noise... or not?

21
Shoot preparation / Benefit in using Override at same FPS as Canon?
« on: August 06, 2019, 06:41:48 PM »
Hi everyone,

is there any benefit (or disadvantage) in keeping FPS Override activated even when it's set at the same frame rate of the Canon menu?

For example: in Canon menu I have 25 FPS, and also FPS Override is at 25 FPS (exact). In this case, is there any benefit/disadvantage in keeping FPS Override activated?

Thanks

22
Shoot preparation / Re: Night shot with 5D3 + ML, how to avoid noise?
« on: August 06, 2019, 04:58:21 PM »
[...] but I am of the unpopular opinion that noise is inherit in the cDNG workflow.
Possible? Is there a technical reason?

23
Shoot preparation / Re: Night shot with 5D3 + ML, how to avoid noise?
« on: August 06, 2019, 04:20:18 PM »
The above numbers apply to 5D3 in 1080p mode (3x3 binning). Things will be different in 1:1 crop mode (ISO 6400 no longer providing a noticeable benefit, but that's not applicable here), or on other cameras (where the DR figures may be slightly different).
This could be the point! I'll surely test 6400 ISO in 16:9 1080p (perhaps the problem was the 5:3 ratio I used mainly to have room of re-framing in post).
[...] with FPS override [...]
Very-newbie question: even if I shoot always in 25fps, in ML menu I usually keep FPS override always activated (both Canon menu and ML override are set on 25fps). Is that a mistake? Should I deactivate ML override when shooting at 25fps?

24
Shoot preparation / Re: Night shot with 5D3 + ML, how to avoid noise?
« on: August 06, 2019, 03:38:14 PM »
Thank you all for your replies.
feel free to use ISO 6400.
Very interesting topic! I didn't know it. You are the wizard here, Alex. Anyway – please forgive my skepticism – even just at 3200 ISO I see a lot of noise (noticeable worsening than 1600), so I'm afraid of using directly 6400 ISO...
Perhaps my issue could be related to the ratio I use? I usually shoot at 5:3 (1920x1152). Do you think that shooting with 16:9 ratio could improve S/Noise performance?

25
Shoot preparation / Re: Night shot with 5D3 + ML, how to avoid noise?
« on: August 06, 2019, 04:07:57 AM »
Photo or video? Are you shooting raw? What's your post processing workflow?
Thanks for your reply Kirby.

Video: more precisely, my first solution is thought as video only, while the second is a combination of video (walking lady) over the timelapse (photos).

Uncompressed RAW 14bit.

My workflow is MLV-to-cDNG through Switch, then directly into Davinci. Nothing more.

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