Re: [Avid-L2] H.264 Gamma Shift Adjustment Standards?

Squeeze and most of the other full featured compressors have filters that can be applied to compensate for these shifts and to improve the quality of the encoded and the efficiency of the encoding. Many of them have presets that you can just drag and drop. Some compensate for gamma or black and white point. Others do a little softening. Some help with field transposition. I think there are a few audio filters as well.

If you're getting a good export from Avid, then that's not the problem. Vimeo has the capability to deliver beautiful video, so that's not the problem.

The problem is in your compression settings. Look for some filters or input settings that could be affecting the export. Are you exporting as RGB instead of 709? If you're going to a computer delivery (internet) then 709 isn't the best choice. If you went RGB, you'd end up with a more "spread" export and that export may not wash out when going through compressor. Is Compressor expecting an RGB file? Maybe. And if you're feeding it 709, that would wash it out You have to make sure that the export settings of the Avid (as far as color space) are the same as the import settings of the compression program.

Steve

On Jun 3, 2013, at 10:13 AM, Martin <martin@MartinNelson.com> wrote:

> I appreciate I am likely beating a dead horse here, but I'm hoping
> someone can't point me to a definitive link to my issue. I have searched
> long and hard and all roads lead me to, well, other roads.
> I am trying to compress a copy of my show for Vimeo. Vimeo requires the
> H.264 codec. I export a copy of my show from MC 5.5.3 Same as Source. At
> this stage I get, as you would expect, a QT that perfectly matches my
> Avid cut for luma and chroma. I then have a choice on my system of
> Compressor, MPEG Streamclip or QuickTime Pro to compress to H.264. All
> three of these tools give me a sequence that is washed out: blacks,
> whites and colors are all dull.
> I've found and installed the X264 codec and tried it and I get a QT to
> the other extreme: blacks crushed, whites blown out and colors
> exaggerated.
> Am I having this problem because none of these compressors are good
> enough? Is there a successful workaround? As inelegant as it is, I would
> be prepared to adjust the levels on my show before export, but how much?
> Honestly, I'm not trying to get folks to repeat a conversation that's
> been talked to death, but X264 was my last lead.
> (Due diligence forced me to do one more search before hitting Send and I
> came up with this
> <http://byteful.com/blog/2010/07/how-to-fix-the-h264-gamma-brightness-bu\
> g-in-quicktime/> from July of 2010 regarding a Japanese version of
> X264. Has anyone tried this? I will be.)
> Any direction would be hugely appreciated,
> Martin
>
> [Non-text portions of this message have been removed]
>
>



[Non-text portions of this message have been removed]



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