If you installed it with Squeeze, try uninstalling the FFDShow codecs.
On 10/7/2011 7:03 PM, blafarm wrote:
> Just tested a slew of Gamma adjustments (in both directions) in Squeeze 7 -- and it definitely doesn't seem like it's Gamma.
>
> Also tested exporting 709 QT and using that as a source for compressions -- again -- and still no joy.
>
> Can't figure out why Avid can export an H.264 that is in "unity" with the timeline -- but Squeeze cannot.
>
> And I'd use Avid, but the quality level is terrible.
>
>
>
>
> --- In Avid-L2@yahoogroups.com, "blafarm"<blafarm@...> wrote:
>> Thanks for your response.
>>
>> The source files are Cannon 5D imported as RGB.
>> The Avid project is YCbCR 709.
>> And I exported all of the QT's as RGB.
>>
>> At first I thought it might be gamma.
>> Then I thought it might 0-255 vs. 16-235 mapping.
>>
>> My Squeeze presets are "known quantities".
>> And I realize I could get into the filter thing...
>> But I was hoping to find the [possible] error of my ways.
>> And just nail this problem without a lot of trial and error.
>>
>>
>>
>> --- In Avid-L2@yahoogroups.com, Jeff Cook<jeff@> wrote:
>>> 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@
>>> 703-980-1104 (cell)
>>>
>>> CookStudios.com
>>> Freelance Video Editing
>>> Washington DC& Portable
>>>
>>>
>>> Quoting blafarm<blafarm@>:
>>>
>>>> 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.
>>>>
>>>>
>>>>
>>>> ------------------------------------
>>>>
>>>> Search the official Complete Avid-L archives at:
>>>> http://archives.bengrosser.com/avid/
>>>> Yahoo! Groups Links
>>>>
>>>>
>>>>
>>>>
>
>
>
> ------------------------------------
>
> Search the official Complete Avid-L archives at: http://archives.bengrosser.com/avid/
> Yahoo! Groups Links
>
>
>
>
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