I got a chance to talk to the DIT on the show I'm working on and he confirmed my suspicion that the CODEX_NEG files are in fact a "Packed" codec with wavelit compression and require a license to unpack and use. Apparently they can be processed on a mac using terminal commands so it's not a program like Red Cine X but somehow uses the mac OS/tool box to take the raw files and convert to DNX 220X and DNX45. In the field they shot to an external CODEX recorder and from those wavelit compressed files they generated the Avid media. They also recorded ProRes Proxy during the shoot. According to the DIT he likes ProRes over DNX when using the Alexa. He said it had less artifacts but I don't think he had any real technical data to back it up, just his experience with it. So I guess I won't be able to access the .dpx files and just because they say .dpx doesn't mean they are a generic DPX format. Gotta love standards or the lack there of.
--- In Avid-L2@yahoogroups.com, John Moore <bigfish@...> wrote:
>
>
> I'm currently working on a multicamera Arri Alexa shot program. I received DNX 220X Avid media which works but it's log C and washed out as
> expected. I took the footage into Resolve 9 and applied a 3D LUT the
> DIT supplied and things look much better but still the setup is high in
> the 100 millivolt range and the peaks are in the 600 millivolt range on
> my Tek scope when I look at the Resolve lut baked in Avid DNX 220X
> media. I'm curious is it common with Alexa and other high end cameras
> to shoot with conservatively high blacks and low peaks. I tried
> applying the Resolve stand Arri to 709 Lut and it's about the same in
> levels. I even tried applying the same lut as an input and an output
> Lut simultaneously but that crushes the blacks and clips the whites.
> I'm fine with what I've got but just trying to learn more about why the
> Lut doesn't give me close to 0 millivolt blacks and 700 millivolt
> whites.
>
> I also have the "Raw" Camera data in a folder named "CODEX_NEG" I assume this means they recorded to CODEX recorders and the files in the folder are .dpx 1.9MB in size. I tried opening a few in Photoshop CS3 and I
> get a black frame with the upper portion of the frame with Rainbow like
> Snow and most of the frame black. I read that Photoshop should open
> .dpx files. Could these be some sort of proprietary CODEX .dpx format? When I try to open them in Resolve 9 Resolve crashes when I click to
> view the file which Resolve seems to view as a clip and not individual
> stills. That part seems right but one click on the file icon and poof
> no more Resolve. Is there some Resolve support lacking in my Version 9
> Resolve Lite that might be better in Ver 10 Lite. I can't seem to find
> the current legacy version of Resolve 9 on the black magic site even
> though I checked the show legacy box. Hmmm
>
> I do have the Avid media so I can press on but I am trying to play like
> the big boys and access the Arri Raw/DPX files to see if the supplied
> Lut would translate better on that. Any suggestions are appreciated
>
> John Moore
> Barking Trout Productions
> Studio City, CA
> bigfish@...
>
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