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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