FORUMS: list search recent posts

CBR for ProResHQ

COW Forums : DaVinci Resolve

<< PREVIOUS   •   VIEW ALL   •   PRINT   •   NEXT >>
Sascha Engel
CBR for ProResHQ
on Jan 2, 2018 at 3:23:14 pm

Dear Fellwo DaVinci's,

I am a bit confused: Originally learned, that by nature ProRes is a VBR based codec.
Now, in DaVinci you do have the option of a CBR checkbox in ProRes.
So you can have CBR in ProRes?
If yes, does it upres the quality?


Thanx.



Sascha

Sascha Engel
KINO KITCHEN Studio
http://www.kinokitchen.co.il
http://www.youtube.com/taikang


Return to posts index

Jeff Sargeant
Re: CBR for ProResHQ
on Jan 2, 2018 at 7:42:32 pm

https://www.facebook.com/Cinedeck/posts/1285605154825889

Apparently you now can create CBR ProRes files in Resolve 14.

Jeff Sargeant
Videographer @
Flowmaster/Hurst/B&M
Hayden, ID


Return to posts index

Tero Ahlfors
Re: CBR for ProResHQ
on Jan 3, 2018 at 3:44:06 am

By its specification (if it hasn't changed) Prores is a VBR codec so while you can export it with different settings you might run into trouble if you're sending it to some sort of quality control check.

I don't believe the quality will change at all. The file size might be a bit bigger.


Return to posts index


Joseph Owens
Re: CBR for ProResHQ
on Jan 3, 2018 at 6:34:44 pm

While I was reviewing CineX-Tools, I started running into the VBR/CBR nature of ProRes a bit more often. Yes, ProRes is native VBR, unlike Dnx, and of course a CBR ProRes file is bigger because there is no packet-reducing efficiency.

I suspect it is also why some applications baulk at third-party-originated exports, since there are likely some departures in how the VBR-packing is accomplished. I expect anyone reading this has encountered the FCP warning "This media is not optimized for use," &c., &c.) and its usually because the media has been cross-coded in a different way.

CBR does have the advantage of a consistent bit-word correspondence -- for sure, an application for splicing within a Quicktime mov (like CineXTools) absolutely has to have that one-to-one in order to do the content insert.

jPo, CSI

"I always pass on free advice -- its never of any use to me" Oscar Wilde.


Return to posts index

Sascha Engel
Re: CBR for ProResHQ
on Jan 5, 2018 at 8:34:57 am

Hi,

Thank you everybody for the detailed and informative response!
I did a test, and yes, the files in CBR are slightly bigger.
Not much though.
So, all in all in it's right to say, that the CBR version,
has to have a slightly - even though I guess, not visible -
better image quality?


Best,



Sascha

Sascha Engel
KINO KITCHEN Studio
http://www.kinokitchen.co.il
http://www.youtube.com/taikang


Return to posts index

Tero Ahlfors
Re: CBR for ProResHQ
on Jan 5, 2018 at 9:00:08 am

[Sascha Engel] "So, all in all in it's right to say, that the CBR version,
has to have a slightly - even though I guess, not visible -
better image quality?"


Bigger file doesn't automatically mean better. VBR is great because it will use the bit rate that the current footage needs. If you have a bunch of dark or bright scenes (or you have crop bars) they will use less data instead of writing everything in the file.


Return to posts index


Shane Ross
Re: CBR for ProResHQ
on Jan 8, 2018 at 6:35:31 pm

Image quality is exactly the same. CBR allows for INSERT EDITING with apps like CIneXInstert and others, so is better.

Shane
Little Frog Post
Read my blog, Little Frog in High Def


Return to posts index

Sascha Engel
Re: CBR for ProResHQ
on Jan 8, 2018 at 10:00:45 pm

Thanx Guys for the clarification!


Greetz.

Sascha Engel
KINO KITCHEN Studio
http://www.kinokitchen.co.il
http://www.youtube.com/taikang


Return to posts index

<< PREVIOUS   •   VIEW ALL   •   PRINT   •   NEXT >>
© 2018 CreativeCOW.net All Rights Reserved
[TOP]