This IS the Avid L2: Re: [Avid-L2] Beating the Dead QT Gamma Shift Horse

Monday, January 4, 2016

Re: [Avid-L2] Beating the Dead QT Gamma Shift Horse

Sounds like you need to make some test exports using color bars. I have found that when I export QT ref to Adobe Media Encoder I have to check the RGB box if I'm going to make ProRes and XDCam 50 files from a DNX QT Ref. If I'm just making DNX the 601/709 works.

Rather then speculate export color bars and make a file. Link back to the file in ama and see what the level is. At least then you have a reference point. I find often times with Avid's QT Ref even though the essence of the video is 16-235 601/709 level the outboard applications seem to treat the files as RGB and wash them out etc... Then sometimes the opposite happens.

Since you are using SAS then export bars and ama link to the file. Are the bars coming back in at the correct level? Move on from there and rinse and repeat.

I do realize that test reference signals are just BS that old farts like me believe in and with networks wanting files without bars it must mean that I'm full of crap to suggest using bars but I guarantee that with a test signal you can find out where the shift is happening.

I have found in my Avid centric world the best assessment tool for me is an ama link back to the file. If you have aja or kona cards you could also use some of the tools to look at the raw file video essence and feed the cards output to a scope but I'm betting you are going to have to use the Avid's internal scopes. While Avid scopes aren't fun to work with if you are just checking color bars they should give you a reasonable idea of where the levels are going south.

---In avid-l2@yahoogroups.com, <davaldod@...> wrote :

Hi, Job, Yeah, I see it in everything i open it in. VLC. MPEG Streamclip. Even when I open the SAS export (whether it comes from a Mixdown to ProRes or Mixdown to DNxHD 175) in Encore, it's just shifted way dark. It's truly like it's coming out of the SAS export that way. I'm completely at a loss here.

David Dodson

davaldod@...

On Jan 4, 2016, at 12:23 PM, Job ter Burg (L2B) <Job_L2@...> wrote:

David, where are you seeing that gamma shift? I mean, what player are you using to watch the SaS export? Did you try and watch it in VLC player? That's the most transparent one, IMHO.

On 4 jan. 2016, at 16:44, David Dodson davaldod@... [Avid-L2] <Avid-L2@yahoogroups.com> wrote:

for me, it's coming out of the Avid, on SAS export as already gamma shifted dark.