[FFmpeg-user] vf_lut3d supports type 3 ?

[Mahesh Pittala]

Hello Paul B Mohal,

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

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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