Thread: VirtualDub2
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Old 17th October 2018, 21:06   #692  |  Link
WorBry
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Join Date: Jan 2004
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Originally Posted by WorBry View Post
Anything useful to add yourself ?
I was responding to richardpl there.

Quote:
Originally Posted by poisondeathray View Post
If richardpl's comment "Avid encodes behaves in similar way" means avid encode and re-import behaves the same way, that pretty much means that's how it is - since it's avid's own official encoder and decoder.
I wasn't sure what he meant there. Anyway I went ahead and re-installed Media Composer to clear that one up. Still can't figure if/how it's possible to export DNxHR_444 from a 1080p project, but the re-imported DNxHD_444 export of the Checkers-444 clip shows the same 'degraded' pattern on the Media Composer scopes.

Do I need to post some scope images or would that be "pointless" ?

Quote:
Originally Posted by poisondeathray View Post
Rant: Historically, it's the worst (near lossless) intermediate ever. Enormous issues and inconsistencies with levels across applications - all over the place. You almost needed to use Avid MC to ensure consistency . Performance isn't even that great decoding wise (FPS), and quality wise it's almost always lower in all tests , PSNR, SSIM or eyeball. This noise on the pattern test doesn't help either
I'd read (same reference that mentioned the intentional 'blur') that DNxHR_444 was designed to be 'visually' (assumed psychovisually) lossless, whereas ProRes_444 tries to get closer to 'mathematically' lossless. But I've seen a number of anecdotal reports complaining about block artifacts especially.

Pity as its really the only 444 export option in Resolve on Windows. Cineform RGB 12bit exports at Filmscan 1/2 quality are too large for my purposes.
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Last edited by WorBry; 17th October 2018 at 23:43.
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