Not sure about Squeeze, but a problem with Cleaner used to be that
anybody could overwrite the presets without necessarily knowing it, so
check that you're not using altered settings.
Otherwise, and unless it's a bug, can you add a video filter inside
Squeeze and get good levels out that way? Only other thing that occurs
just now is, are you sure it's the black levels and not a gamma/gray
levels issue?
--
Jeff Cook
jeff@cookstudios.com
703-980-1104 (cell)
CookStudios.com
Freelance Video Editing
Washington DC & Portable
Quoting blafarm <blafarm@yahoo.com>:
> Every H.264 file we create in Sorenson Squeeze 7 (PC) has elevated
> black levels and reduced contrast. If I didn't know better I would
> have thought it was a RGB vs. 709 issue -- but I think we've
> disproved that.
>
> We have exported test files from Avid (PC) using three different
> types of uncompressed QuickTime RGB (0-255) files -- Same as Source,
> Avid Codecs and Avid 1:1x.
>
> And to check them for "unity" -- we re-imported them back into Avid
> as RGB -- and they match perfectly with the timeline.
>
> Then we imported those uncompressed QuickTime files into Squeeze and
> compressed them using three different types of H.264 codecs --
> MainConcept, Apple and Sorenson.
>
> We have viewed all of these compressed files in QuickTime, Windows
> Media Player, VLC, Firefox, Chrome and Internet Explorer -- and they
> all have the same black and contrast problem.
>
> The we imported all of the H.264 files back into Avid as RGB -- and
> they exhibit the exact same problem -- and do not match the timeline.
>
> Finally, we exported an H.264 file directly out of Avid -- which I
> believe uses QuickTime codecs -- and the video levels are fine. And
> then we re-imported that Avid H.264 file back into Avid as RGB --
> and the levels match the timeline perfectly.
>
> I realize H.264 colorspace is different -- but the black level and
> contrast differences we are seeing are significant. More confusing
> -- is that the Avid H.264 export matches the timeline perfectly.
>
> And, lastly, the "Black Normalization to 16" checkbox in Squeeze 7
> -- has had absolutely no affect in any of our tests.
>
> Anyone else see this problem -- or have a solution?
>
> Thanks in advance.
>
>
>
> ------------------------------------
>
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