[FFmpeg-user] FFMPEG and OCIO

DEV - VFXBOAT dev at vfxboat.com
Fri Jan 20 17:26:34 EET 2017

Our intended workflow goes like this:

Files fron shooting arrives at the lab in log files (could be slog3,
alexalogc, etc)

We create custom luts for the shooting, and keep using those luts in vfx an

Every artist works with the log files using the lut, and render dpx log

Those dpx are then transcoded to dnxhd or prores or h264 with the lut
burned in with ffmpeg.

But, the exr rendered by maya are in linear, so, in our existing pipeline i
have to transform the exr to png using the ocioconvert api, and then
trancode those png to mov with the ffmpeg.

It would be useful, not just for me i think, to leave the color space
transformations to OCIO where we can set the rules for the transformations.


El vie., 20 de ene. de 2017 09:40, Reto Kromer <lists at reto.ch> escribió:

> Kevin Wheatley wrote:
> >On Fri, Jan 20, 2017 at 10:54 AM, Carl Eugen Hoyos
> ><ceffmpeg at gmail.com> wrote:
> >> What is OCIO?
> >
> >OpenColorIO http://opencolorio.org/
> >
> >
> >I'll say that adding OCIO to FFmpeg is not simple in the
> >general sense. The two packages are not in the same space,
> >OCIO is mostly focused on high end VFX tools and as such is
> >heavily in the floating point processing domain, FFmpeg is
> >not. It may make sense to add an extension to the OpenEXR
> >codec to extend the capabilities of the float-> integer
> >conversions triggered by the apply_trc option but that is
> >only from a conceptual point of view I did not look at the
> >code impact or even if it really fits well with FFmpeg.
> I guess that at some point we'll indeed need an integration
> of OCIO into FFmpeg, because in the cinema world the OpenEXR
> codec is slowly replacing the DPX codec - which BTW is good
> news, because DPX is a very confusing construct.
> Best regards, Reto
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