[Levan Katsadze]

Wow, Finally! I did it! I fixed this problem.

After soooooooo much Googling and testing and Googling and testing and testing, here is what I did finally:

At first, I’ll say that this is the information of the source file:

Downloaded from: Youtube
Resolution: 3200×1800 (almost 4K)
Framerate: 30fps
Bit depth: 8 bits
Color space: YUV
Duration: 3 hours and 41 minutes
Size: 19 GB

And, well, the Project Properties in Sony Vegas:

Pixel format: 32-bit floating point (video levels)

–> NOTE: the colors in Sony Vegas Preview window was absolutely the same as source colors. I mean, there was no problem about studio RGB vs Computer RGB.

And, this is what I did:

I just typed this text in the command line tool in x264wfv window:

–range pc –colormatrix bt709

That’s it. It just rendered fine. Absolutely the same color output as source.

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Video editing is cool 😀 Big headache, but cool 😀

[Levan Katsadze]

And, I have just one more question. It is actually technical, and maybe not important, but please tell me, why most of the TVs and many display monitors doesn’t support 0-15 and 235-255 video playback? Why they support only 16-235 ??? Why? what is the point of it?
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What is the point of any technical limitation?

I understand, that if technology is not advanced enough to make something, then it is not made, but I know that technology is already advanced and manufacturers can make displays, that support full video levels, so I don’t understand, why they don’t make it? Why they limit it? What’s the point if it?

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[Levan Katsadze]

[Norman Black] “Sophisticated compositing, of certain things, is an application for 32-bit. Is that what you are going to do in Vegas?”

Well, why not? maybe not now, but actually I want to learn things deeply, because I love video editing and generally I love digital industry. Well, maybe it’s better to go to special school of video production, but in my country, there is no such thing. My country, Georgia, actually has just started making steps into digital industry. So, internet is my best friend when I sit on the computer.

[Levan Katsadze]

[Norman Black] “If you watch your final rendered video on TV or computer or basically anywhere, it will be in an 8-bit video format. Your PC video card and monitor are probably incapable of 10+ bit display.”

Yes, maybe the final render will be in 8-bit format, but this video shows that even if the final is in 8-bit codec, the 32-bit editing gives us much more precise and much better results.

https://www.lynda.com/home/Player.aspx?lpk4=30903

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[Levan Katsadze]

Thanks, well, if I want to use 32-bit pixel format and also want to watch the final rendered video on my computer, not on my TV, then what options should be best for this situation?

Are these the best options?

Pixel format: 32-bit floating point (full range)
Compositing gamma: 1,000 (Linear)
View transform: Off

Well, but as I see, if the “View transform” option is set to “Off”, then compositing gamma 1,000 and 2,2222 just looks the same. Actually, in video preview window, the change is not visible for my eyes, but very small change is visible in RGB Parade. So, I am confused, which option (1,000 or 2,222) should be better for my situation?

And also, please tell me, why “View transform” options are needed? I saw this help page, but I still don’t understand, why I should not set it to “Off”?

And, also, if the video is darken and clipped by these options, then it’s not a problem, right? I can use Video levels FX or brightness or any other FX and correct the playbck.

[Levan Katsadze]

[John Rofrano] “The color depth is controlled by the source video”

[John Rofrano] “The pixel format has nothing to do with the color depth of the video”

[John Rofrano] “The pixel format has to do with the precision of the math used to calculate color values.”

[John Rofrano] “32-bit pixel format gives you greater precision to represent the color in your video”

[John Rofrano] “It does not use more color depth than the original video already has.”

Thank you so much, now I really understand what does 32-bit pixel format mean. And also, recently I saw these links and they also helped me so much:

Understanding 32-bit format
https://blogs.adobe.com/VideoRoad/2010/06/understanding_color_processing.html

from Lynda.com
https://www.lynda.com/home/Player.aspx?lpk4=30903
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These articles also helped me so much:
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https://www.glennchan.info/articles/vegas/colorspaces/colorspaces.html
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https://www.glennchan.info/articles/vegas/v8color/vegas-9-levels.htm
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And, well, about “video levels vs full range”, well as I understand, “full range” has range advantage (0-255 vs 16-235) than “video levels”, so full range is better, right? because, as I know, “video levels” is old standard (Studio RGB) for TVs, and “full range” is new standard for computers (Computer RGB).
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[Levan Katsadze]

Thank you for the reply, well now, as I understand:
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8-bit pixel format uses 32-bit color depth (24bit RGB + 8bit Alpha = 32bit color depth)
…………………. so, it is 16,777,216 colors + Alpha
…………………. and the range is 16-235

32-bit (video levels) pixel format uses more than 32bit color depth (and please tell my how many?)
………………… and the range is also 16-235

32-bit (full range) pixel format uses the same color depth as 32-bit (video levels) pixel format.
………………… and the range is 0-255
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Please correct me if I am wrong in anything. Sorry, maybe I am a total ignorant about understanding these things.