[FFmpeg-user] vf_lut3d supports type 3 ?

[Mahesh Pittala]

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 ?

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