I found a very interesting thread on Avid L2 on FaceBook. The problem was Avid was rendering different levels on a sequence on different Avid computers. Terry and Eric were discussing this. I learned that Adobe requires a rerender if you move to a new computer to avoid this issue.
According to the thread and programmers that Terry talked to different GPUs will render differing levels so it is known that rendering on a different computer can shift levels. I personally have never seen this on Avid other than when I ran into the LUT scaling bug when I bounced from an 8.4.X Avid with proper LUT scaling to an 8.5.3 Avid that had the LUT bug. That I understand but how do different GPUs render things a slightly different levels?
I thought it was all about numbers under the hood. If I had black at 16,16,16 or any solid color if I put a submaster on it and render I wouldn't expect the level to shift at all. I would think if I took color bars and rendered a submaster that I should see a level shift if the GPU is effecting the resulting level would this be obvious. It's kind of hard to test multiple systems or switch gpus on a given system to test this. I don't doubt the problem is real it just escapes me what is happening under the hood.
Does rendering involve some kind of voodoo math compression schemes that could result in varying levels after rendering with different gpus? I am truly perplexed about this and wonder why I have never noticed this in Avid other than the aforementioned issue that had nothing to do with the gpu but with Avid LUT scaling.
Can anyone explain the broad strokes of how different gpus would render a sequence resulting in slightly different video levels?
John Moore Barking Trout Productions Studio City, CA bigfish@pacbell.net
__._,_.___
Posted by: John Moore <bigfish@pacbell.net>
| Reply via web post | • | Reply to sender | • | Reply to group | • | Start a New Topic | • | Messages in this topic (1) |
Have you tried the highest rated email app?
With 4.5 stars in iTunes, the Yahoo Mail app is the highest rated email app on the market. What are you waiting for? Now you can access all your inboxes (Gmail, Outlook, AOL and more) in one place. Never delete an email again with 1000GB of free cloud storage.
this is the Avid-L2
.
__,_._,___
No comments:
Post a Comment