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Messages - Skinny

#76
right, if you ETTR for iso 100, then you will gain dynamic range. but if you ETTR for 800, then.. I don't see a point  (in using dual 100/800 and not just single iso 800)
#77
Quote from: gabriielangel on March 10, 2023, 02:43:08 AM
Example, if you are using ISO 100/800, Use Single ISO 800 to expose the highlights without clipping, then switch to Dual ISO 100/800 to record.
And what will be the point of using dual iso, if you expose so the highlights are not clipping with iso 800?

The shadows of the iso 800 will be cleaner than the shadows of 100 pushed +3 stops up.. you will probably get more noisy image by using dual iso in this scenario, because lines with 100 iso will be very underexposed
#78
Quote from: phillipmpls on February 16, 2023, 07:01:33 AM
Problem is that my system doesn't seem to play very nice with the ProRes
Hi, I know it is off-topic but have you tried exporting to DNxHR? Maybe it will play faster on your system.

And I don't know but have you tried using simple soft-clip function in resolve to create highlight roll-off?
It is explained here, maybe not the best video in the world but anyway.. it is just one parameter.

https://www.youtube.com/watch?v=s5Onm_SrUNY
#79
General Chat / Re: Canon Eos 550d warning
March 07, 2023, 03:23:17 PM
Maybe 7.4 is on the low side.. when batteries are fresh they are at about 8.4 volts actually. two cells of 4.2v when fully charged. Maybe 8.3 under load..

But this camera will probably show overheat sign after some time anyway, I did timelapses with it and after about two hours this sign usually appeared. I used internal battery and it was enough for ~2,5 hours at 1fps raw video. I also used power saving like turning off the display after 15 seconds or so.

It should be cooler with external adapter though..
And as I can guess, this overheat is mainly the sensor itself
#80
Share Your Videos / Re: macro video 5d3 raw
March 07, 2023, 05:07:35 AM
if there is a wind then tripod won't help.. all those branches are moving anyway.

Quote from: 70MM13 on March 06, 2023, 01:29:24 PM
focal length was 12 inches.
I mean what mm lens have you used? 12 inches = 300mm?
#81
General Chat / Re: Canon Eos 550d warning
March 07, 2023, 04:46:07 AM
In theory, 9v is converted to other voltages in camera by DC-DC converters, and usually voltage doesn't matter that much because when there is more voltage, you will just draw less current. So the power consumption (watts) is still the same, and heat should be about the same....
But in reality it can be totally different.

For example sometimes it is quite the opposite. Low voltage means more current draw, and power mosfets in dc-dc converters can even overheat because of the low voltage, in some systems.

So I believe there should be some optimal voltage with least amount of heat produced.

9v could be reduced to 8,2-8,4 by adding any silicon diode in series. Diode should be powerful enough to handle at least 2A or so (current camera consumes). Cheap 1A diodes in parallel could be used, like 4-6 of them. For example 1n4004 that can be found everywhere. And diode(s) will become hot so they should be located somewhere, not in the dummy battery.
#82
Share Your Videos / Re: macro video 5d3 raw
March 06, 2023, 10:51:02 AM
Hi! What focal length it was? And why didn't you use software stabilization on top? I think it can provide almost steady picture with this high-resolution footage.
#83
General Chat / Re: AI and magic lantern
February 20, 2023, 06:11:12 PM
I think maybe in near future AI could help in making ML better.
Your conversation made me look at what ChatGPT is capable of, and I remembered one thing.. I have files from glitchy SD card, the files are repaired by windows but after that they have no extensions. I know it should be .mp3 or .wav because it was a card from my recorder. So I could check them all manually or search for a software that can do it for me (and I am sure such software exist), but I always was too lazy :)

So I decided to ask ChatGPT if it can write a windows batch script file, that will check every file in a folder, read the header inside the file and if it corresponds to .mp3 or .wav rename them to correct extension.
And it did just that, not from the first try but really quick anyway... So I placed .bat file in the folder and repaired thousands of files instantly.

It was actually cool, maybe for you it sounds like a trivial thing, but for me it was an example of really helpful AI that can solve some actual problem.

Of course things like batch script and file headers are well documented, but AI field develops so fast right now, who knows what technology could offer in a year or two.


By the way, it is really bad at ASCII art :D It can create a decent art but the picture is absolutely not what you asked for :D I think it is like a blind person who can paint for some reason and have skills, but can't see what he is doing
#84
Reverse Engineering / Re: LiveView Investigation
February 20, 2023, 05:55:51 PM
Congratulations! This is huge, it can take this cameras to a whole new level! You have really badass skills in reverse-engineering :)
#85
I see.. yeah, maybe Cubic Zirconia is a little bit cheaper :)
It is really cool that in the end you made this lens useable even though it is not perfect...
By the way I think it doesn't look that bad when you zoom in at 1.4. In the night scene it should look interesting, maybe it can be used as an like artistic effect.

QuoteFor a description of such a prism, see: https://en.wikipedia.org/wiki/Dichroic_prism
I like how the light is perfectly split in this photo:



It is a prism from a very old and unique soviet camera :)
#86
Interesting... I don't really know anything about optics, but is there any glass types (or maybe crystal) that can achieve the same effect with less thickness so it can fit?
#87
cool, show us how it looks at 1.4! I think some rainbow effects are nice in certain situations :)
#88
Hi everyone, here is a small review of Helios 44M and some footage that was shot in september :)



By the way, is it too saturated? Unfortunately we only have a laptop with a *very* poor screen and no way to check on any decent monitor for now..
#89
I always use 12 bits (with 5D2) and the only difference is *slightly* more noise in shadows, but there is almost no difference really. For example, 10 bits are 10 times worse. But 12 are fine for me... saves some card space.
#90
Maybe.. good point. Then it is better to just hide everything if possible.

I am not that experienced with this whole.. thing. For example in my case, they just took me to the special room like the ones you usually see in the movies.. with fences everywhere and locking doors. Asked a lot of questions for ~30 minutes. I knew it was only for psychological pressure because I heard other guys stories. But the whole bus was waiting for me, and I was afraid that it will leave.. but luckily, the driver understood the situation and other people were also supportive :)
#91
I think an option to turn the display 90 and 180 degrees as well as mirroring it could be useful in some situations.. What about RAW recording while using your app?
#92
Actually I thought about this feature :)
I crossed the border recently, and was interrogated. Nothing serious and luckily they didn't check my camera. There were some videos where I say things against our fascist government :) So if you could for example encrypt video in camera, after filming.. even if it is slow. It could be useful.

Maybe even the option to hide videos from camera (like change file extension) so they won't play - can already help in many cases.
Or a password for the camera, with "wrong" password which will trigger a card format, hehe
#93
Camera-specific Development / Re: Canon 40D
December 13, 2022, 12:26:29 PM
congrats! it is very interesting to watch your progress even if I don't have 40D :)
#94
Share Your Videos / Re: Theory on Life - Canon EOS M
December 13, 2022, 12:17:21 PM
Quote from: ML700D on December 12, 2022, 02:40:37 PM
when activate it the clip will darken, sometimes underexposure. In this case I just increase the light strength Lighten to around 70.
If you want to have the exact look as it was before checking "creative adjustments", just reduce dark strength to zero. It will look exactly the same  :o :P

I even think dark strength should be set to zero by default with log C, so people can do adjustments easily if they want to.. But it is just my opinion :)
#95
Share Your Videos / Re: Theory on Life - Canon EOS M
December 11, 2022, 04:26:42 PM
I found that if you use CA desaturation in mlv app - sometimes the footage may begin to look like it was denoised or compressed to some very crappy quality... so I almost never use it, except when it is really necessary.

In this example in your NLE you can easily use color replacement tool or something like that, select for example this dark green color (use color picker), and desaturate it or change it to the color of paper. Use mask to select problematic area (for example, this book) so you won't change colors in other areas of your image.. it is relatively easy.


By the way, I like the look of your video, how you color grade it?
#96
I often use 30 fps and export at 24 to create just a little slowmotion.

The problems are almost unnoticeable, sometimes I see frame tearing or slight stutter. You can barely notice it.
It is not only on my devices, for example https://www.avsforum.com/threads/fixed-apple-tv-4k-lacks-support-for-24-000-video.2961262/

So as far as I know, most consumer devices were made for 23,976 and not for true 24. Of course they can play 24 but it is not their native framerate. They usually have only one clock generator and it can't support both, so manufacturers choose 23,976 because it is more common. As well as 29,97 and 59,94 instead of 30 and 60...

Some info explained here https://github.com/mpv-player/mpv/wiki/Display-synchronization
They have to invent a lot of stuff to deal with this small difference between framerates..

And from what I see, it is just better to stick with 23,976 for the internet. But for now MLV App can only export at 23,976000 and not at 23,976024.
I don't really know if it should be exactly 23,976024. Or should it actually be 24 * 1000 / 1001 ?
I hope someone can clarify all this stuff..
#97
Probably noob question, but.. what framerate should I set on export?
I read somewhere that most consumer devices can't play exactly 24 fps smoothly, they are made for 23,976.. and for example my monitor has 59.9hz instead of 60. It seems like clips with 23,976 fps (from camera standard .mov) play better, no tearing artefacts or stuck frames. While 24 fps exported from MLV App have such problems sometimes (on my computer at least).

Should I export to 23,976 to maximize compatibility?
And there is a problem, with standard .mov files from camera I can see framerate: 23.976024
If I export with MLV App I can only set 23,976 and it will be 23.976000

Is it not standard? will services like youtube transcode the file and change framerate to 23.976024? Maybe we need a preset for exporting 23.976024?
#98
@theBilalFakhouri congrats with new achievements, cool stuff guys! Do 300mhz, why stop at 280 :D
@GianlucaM83 nice virus ti :) I can see a lot of musicians here on ML forum for some reason :o
#99
I think it is a great idea. :) If you can make DSLR controller compatible with ML - it can replace hdmi monitors and remote control.

For extra features...

  • An option to see clearly if something is connected to the USB and if DSLR is detected, etc. so - detailed status information. Because with existing android apps it is really hard to tell if everything is connected and why it doesn't work sometimes.. Especially if I'm trying to use long cables and so on.
  • And if connection with the camera is lost, reconnect everything automatically..
  • Probably at least some compatibility with ML raw..
  • It could be very cool if the app can trick the phone to think that the DSLR is one of built-in android cameras, if it is possible at all. With this option it will be very fast and easy to take a picture with DSLR and immediately upload it on social media such an instagram for example, without saving and transfering the file. Like it is native phone camera.
#100
thank you for trying :) there was an old thread somewhere on the forum, someone had working sd to cf adapter but as far as I remember - no information about what adapter exactly and what write speed it can reach.

p.s. it is not "mine" version, I just put a link :)