[FFmpeg-user] vf_lut3d supports type 3 ?

[Paul B Mahol]

On Mon, May 9, 2022 at 8:00 PM Mahesh Pittala <mahesh at multicorewareinc.com>
wrote:

> Hello Paul B Mohal,
>
> BBC has released different types of LUT's, attached the paper. Do you have
> any plans to add support ?
>

I will repeat one last time. CUBE specification have not types of lut.

There is only input/output range specification for CUBE files which to my
knowledge is properly supported.
Also lut3d filter operates and produce rgb only colorspace output.

So have you actually tried those luts with recent ffmpeg (not old one) and
reported your findings?



>
> Thanks,
> Mahesh
>
> On Mon, May 9, 2022 at 1:15 AM Paul B Mahol <onemda at gmail.com> wrote:
>
> > On Sun, May 8, 2022 at 9:28 PM Mahesh Pittala <
> mahesh at multicorewareinc.com
> > >
> > wrote:
> >
> > > Hello,
> > >
> > > I am trying to convert HLG to SDR using 3D LUT cubes freely distributed
> > by
> > > NBCUniversal. (3-NBCU_HLG2SDR_DL_v1.1.cube
> > > <
> > >
> >
> https://github.com/digitaltvguy/NBCU-HDR-SDR-Single-Stream_Workflow_Recommendation/blob/main/LUTS_for_Hardware_Devices/3-NBCU_HLG2SDR_DL_v1.1.cube
> > > >
> > > )
> > >
> > >
> >
> https://github.com/digitaltvguy/NBCU-HDR-SDR-Single-Stream_Workflow_Recommendation/tree/main/LUTS_for_Hardware_Devices
> > >
> > > It seems the LUT conversion appears to be a modified “Type 1” which is
> > > mapping absolute signal peak to narrow range (10bit code value 940).
> > This
> > > value should allow code values all the way up to 1019
> > >
> > > Does ffmpeg's lut3d implementation support type 3 ?
> > >
> >
> > cube lut3d specification says nothing about type 3, whatever type and 3
> > means in this context.
> >
> >
> > >
> > > My CLI:
> > > ./ffmpeg  -i Input_hlg_422_10bit.mov -vcodec v210  -vf
> > > "lut3d=interp=tetrahedral:file= 3-NBCU_HLG2SDR_DL_v1.1.cube
> > > <
> > >
> >
> https://github.com/digitaltvguy/NBCU-HDR-SDR-Single-Stream_Workflow_Recommendation/blob/main/LUTS_for_Hardware_Devices/3-NBCU_HLG2SDR_DL_v1.1.cube
> > > >
> > > " -an  output_SDR_422.mov
> > >
> > > Thanks,
> > > Mahesh
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