[FFmpeg-user] Encode mov from exr [linear>logC>rec709]

ggarra13 ggarra13 at gmail.com
Sat Feb 23 00:45:44 EET 2019

On 2/22/19, Clement Poulain <clpo at dupevfx.com> wrote:> Hey guys,>> I am working with an exr image sequence (colorspace: linear)> I have a lut file to go from AlexaV3LogC to rec709.Could use lut1d filter, ihf you have .cube 1D LUT file.> Obviously to do the encoding i need to change the colorspace first.> I can't use apply_trc flag as AlexaV3LogC is different from ffmpeg logC> colorspace.>> To counter that in Nuke i used a Expression node with this value in every> channels (channel r example):> *r>0.0106232?(log10((r + 0.00937677) / 0.18)*0.2471896) +> 0.385537:(((r+0.00937677) / 0.18) + 0.04378604) * 0.9661776*>> Which is the same than using a OCIOColorSpace node with in=linear and> out=AlexaV3LogC>You should not use ffmpeg for this.  Use oiiotool which is part of the openimageio project.  My viewer ships with a precompiled version of it and also supports OCIO. You can find my viewer at:http://www.sourceforge.net/projects/mrviewer _______________________________________________> ffmpeg-user mailing list> ffmpeg-user at ffmpeg.org> https://ffmpeg.org/mailman/listinfo/ffmpeg-user>> To unsubscribe, visit link above, or email> ffmpeg-user-request at ffmpeg.org with subject "unsubscribe"._______________________________________________ffmpeg-user mailing listffmpeg-user at ffmpeg.orghttps://ffmpeg.org/mailman/listinfo/ffmpeg-userTo unsubscribe, visit link above, or emailffmpeg-user-request at ffmpeg.org with subject "unsubscribe".

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