This IS the Avid L2: Re: [Avid-L2] Initial Transcode: Dark, Re-transcode: Fine, Reimport: Dark

Tuesday, November 27, 2012

Re: [Avid-L2] Initial Transcode: Dark, Re-transcode: Fine, Reimport: Dark

When you're done you should be able to relink your cut to your original
AMA files and transcode the final sequence again to DNxHD115. You could
test it now to make sure it will work for you. Since your transcodes are
now working fine, it shouldn't matter that the levels in the original
transcodes are stretched.

Cheers,
--Michael

On 12-11-27 10:55 AM, Martin wrote:
>
> I am fully confident the answer to my problem has been covered
> somewhere. But I have searched Avid's documentation and the forums (I've
> posted <http://community.avid.com/forums/t/114529.aspx> , as I always
> do, on Avid's MC forum first, hoping not to disturb this lofty realm
> with my trivial concerns) with no success. I will offer first an
> executive summary and then a more detailed description of my issue and
> what I've already tried. I will happily and humbly take any advice or
> links to advice.
> The Short of it:I started this project by linking to a lot of AMA files,
> captured, I believe, on a Canon 5D and a Canon 7D (I don't have easy
> access to this information, but if it's useful, I could get it). I then
> transcoded to DNxHD 115, autosynced every clip to two audio files,
> multiclipped A and B cameras for about a quarter of the footage and then
> started editing. But I belatedly noticed (yes, I should have spotted
> this earlier) everything looks crushed and blown out - pushed at both
> ends. I've checked the original files within and without Avid and they
> look fine. When I transcode some of these files again, they look fine.
> If I decompose a portion of the sequence and then reimport, I get
> something better than the original transcode, but still not true to the
> original files or subsequent transcodes.
> Eventually, I'm going to want to color correct. I would like to do it
> either on a sequence built from untranscoded files or, preferably, on a
> DNxHD 115 sequence that looks like the original file. Every attempt
> I've made to produce one of these sequences has so far failed. So, my
> questions are:
> 1. What did I do wrong and how do I prevent doing it in the future?
> 2. Can I somehow re-transcode everything and get it to all fall back
> in place for the rest of the edit?
> 3. Or can I take a final sequence and reimport, re-transcode or
> relink in some fashion to get what I'm out for?
> OK, the short version wasn't short at all. Maybe I'll stop here and see
> if I get any responses or specific questions. Here is a link
> <http://www.martinnelson.com/Transcode%20Issue> to example still
> exports of an original h.264 clip, the original transcode, the decompose
> and frame grabs of their respective waveforms.
> And since someone is bound to ask, I can't be absolutely certain Perian
> wasn't installed on the initial transcode, but it has definitely been
> uninstalled for all subsequent tests except when I tried to force a bad
> transcode with it installed. Even that transcode came through fine.
> Any help anyone can provide will be greatly appreciated.
> Martin
>
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