[FFmpeg-user] Alexa input dpx

Dave Rice dave at dericed.com
Thu May 21 01:35:04 CEST 2015

> On May 20, 2015, at 9:34 AM, lorenzo angeli <lorenzo.angeli at efestolab.uk> wrote:
> Cheers Carl,
> here is the complete command with output debug* :
> http://pastebin.com/wn7j6Bsv
> The problem is that the input sequence of dpx has an AlexaV3LogC color
> space, and I'm applying a lut which expect to have that type of color space
> as input.

AFAIK ffmpeg only supports linear sampling in dpx. I think support for logarithmic dpx would be very helpful. For now there's various workarounds with filters such as haldclut, see: http://trac.ffmpeg.org/ticket/3751.
Dave Rice

> In Nuke (which is the tool I'm using to check the output) on the read node
> I can define what color space is the input. It does assume is cineon (as
> it's dpx), but I can change it to alexa.
> Just wondering if there's any way to do the same with ffmpeg, or if not ,
> what's the alternative way.
> Thanks a bunch.
> L.
> * note there's another input for a first image before the clip, you can
> ignore that.
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