Hi Martin:
My impression is that Compressor does not properly handle DNxHD
codecs (deliberate indifference, perhaps?)
I find the following gives pretty decent results:
- transcode to ProRes inside Avid - will look identical
- export ProRes quicktime as RGB Same-as-source - will look more
'spread'
- run ProRes export through compressor to generate H.264
It won't be a perfect match to what you started with, but will look
a lot better than the washed out stuff you're seeing now.
Cheers,
--Michael
On 13-06-03 10:31 AM, Martin wrote:
>
> Thanks Steve. I got a little lost in your last paragraph.
>
> --- In Avid-L2@yahoogroups.com <mailto:Avid-L2%40yahoogroups.com>,
> Steve Hullfish <steve4lists@...> wrote:
>
> > The problem is in your compression settings. Look for some filters
> or input settings that could be affecting the export.
>
> For the sake of this conversation I'm using Compressor. There are no
> filters set.
>
> >Are you exporting as RGB instead of 709?
>
> I"ve been exporting 709. The project was 709, roundtripped to DaVinci.
> (Footage was shot 601 on Canon 5D & 7D, brought in AMA and then
> transcoded to DNxHD 175 709) A Same-as-Source 709 export yields a QT
> that matches what I see in Avid (and matches upon AMA reimport). An
> RGB Same as Source export gives me something darker, brighter and more
> saturated (but, oddly, still matches upon AMA reimport).
>
> >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.
>
> OK, this is where you lost me. Are you saying I should export RGB
> (even though the project is 709) so the 'more "spread"' QT will
> compress in H.264 to something close to the original? I just ran a
> test. I exported :02 from Media Composer, same as source, but with RGB
> selected. The QT does look darker, brighter and more saturated ---what
> I'm guessing you mean by more spread. But if I then send it to
> Compressor and compress to H.264 I get something exactly the same
> (washed out) as if I had exported 709.
>
> >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.
>
> I don't know if Apple Compressor or QTPro or MPEG Streamclip have a
> setting to switch between 709 and RGB. I can't find them.
>
> My brain hurts,
>
> Martin
>
> >
> > Steve
> >
> > On Jun 3, 2013, at 10:13 AM, Martin <martin@...> 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\
> <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]
> >
>
>
[Non-text portions of this message have been removed]
| Reply via web post | Reply to sender | Reply to group | Start a New Topic | Messages in this topic (8) |
No comments:
Post a Comment