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spunge
spunge

, England
Joined: 27. Oct 2006
Posts: 962

Full black rendering 16,16,16

#1 - 20. Jul 2016 16:49
I render out of Vegas as an uncompressed AVI, then compress with Legion. 

Here's how a fully black screen looks: http://imgur.com/nBArQtS

As you can see, the youtube "black" is much darker than the video. I checked with photoshop and the colour is 16,16,16 instead of 0,0,0.

Any ideas what could be causing this and how to fix it? 

Edit, it seems the file is coming out looking fine until it's uploaded to youtube. I've seen some posts about the "safe" colour range but I'm not sure if that applies to this.

Last changed: 20. July 2016 17:08
Dec
HLAE

Karlstad, Sweden
Joined: 7. Oct 2006
Posts: 2730
#2 - 20. Jul 2016 17:18
Can you link the clip or is it secret business? :P
juggaknot
Airwalk Media

LOLville, Romania
Joined: 2. Oct 2007
Posts: 2766
#3 - 21. Jul 2016 07:03
looks good till youtube ?
spunge
spunge

, England
Joined: 27. Oct 2006
Posts: 962
#4 - 25. Jul 2016 14:17
Yeah that seems to be the case. I'll do a short test render.

Any ideas?
psh
HLAE

Sofia, Bulgaria
Joined: 9. Nov 2008
Posts: 357
#5 - 25. Jul 2016 16:34
Maybe this will help?
spunge
spunge

, England
Joined: 27. Oct 2006
Posts: 962
#6 - 26. Jul 2016 00:56
I just gave that a try and it didn't seem to help. I tried both Computer to Studio, and Studio to Computer.

It seems like all of the info (such as that page) is the reverse of the issue which is why I tried the reverse filter. 

The problem is everything appears LOW contrast (blacks aren't full black, presumably whites aren't full white), whereas that appears to be a guide to correct higher contrast.


Here's the examples with each version of the filter, the very start of the clip should be pure black:

Computer RGB -> Studio RGB:

https://www.youtube.com/watch?v=j0rzutsnJok&feature=youtu.be

and Studio RGB -> Computer RGB

https://www.youtube.com/watch?v=nNpMm889Eqk&feature=youtu.be

The black colour (after checking in photoshop) of the uploads are 29,29,29 and 16,16,16. So the fix in the guide made it worse, and the reverse fix did nothing. 

I'm getting the impression that YouTube is converting a 0-255 into a 16-235, so it's losing contrast. But info on the problem seems to imply the opposite so I'm a bit confused.

Edit: Ok so, it appears to be from an nvidia setting. The default (under the 'video' tab) is to use the player defaults. I think HTML5 videos are choosing to use the 16-235 range. Overriding it to use the custom nvidia settings and changing it to 0-255 seems to have fixed it. 

I'm not sure how other videos avoid the issue though, presumably from different formatting (maybe videos that don't support HTML5?)

Last changed: 26. July 2016 05:30
ripieces
HLAE

, Germany
Joined: 13. Apr 2007
Posts: 1816
#7 - 28. Jul 2016 11:09
The videos that are fully black use a different codec (VP9), yours uses avc1.4d401e.

You can right click the HTML5 player and select stats for nerds to see that.

Most likely your video is still in Studio RGB, adding a conversion filter in the project will not change the final output!

http://mmdv.com/vegastips/index.php?title=Codecs#What.27s_the_difference_from_Studio_RGB_and_Computer_RGB

Edit: Have a look at the Table of Codecs here, this should make your problem very clear and also offer a solution:
http://www.glennchan.info/articles/vegas/v8color/vegas-9-levels.htm

PS: Don't forget to deactivate the range forcing in NVIDIA settings.

Last changed: 28. July 2016 11:22
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