Re: [FFmpeg-user] vf_lut3d supports type 3 ?

2022-05-09 Thread Dennis Mungai 
On Sun, 8 May 2022 at 22:28, Mahesh Pittala 
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 ?
>
> 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
>
>
Hello Mahesh,

Have you tried out the libplacebo filter in ffmpeg? It's documented to have
custom 3D LUT support and loading shaders too.
This should work on any Vulkan-capable GPU. Grab a Windows build with
Vulkan and filters enabled from https://www.gyan.dev/ffmpeg/builds/ and
test.
See the docs
https://git.ffmpeg.org/gitweb/ffmpeg.git/blobdiff/23c92e14f5fdb0c2928b44bb94d4c0711439e1c7..234c824820d4c17612c9745e74ef6c934679d138:/doc/filters.texi
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Re: [FFmpeg-user] vf_lut3d supports type 3 ?

2022-05-09 Thread Paul B Mahol 
On Mon, May 9, 2022 at 8:00 PM Mahesh Pittala 
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  wrote:
>
> > On Sun, May 8, 2022 at 9:28 PM Mahesh Pittala <
> mah...@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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Re: [FFmpeg-user] vf_lut3d supports type 3 ?

2022-05-08 Thread Paul B Mahol 
On Sun, May 8, 2022 at 9:28 PM Mahesh Pittala 
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
> ___
> ffmpeg-user mailing list
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> ffmpeg-user-requ...@ffmpeg.org with subject "unsubscribe".
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[FFmpeg-user] vf_lut3d supports type 3 ?

2022-05-08 Thread 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/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

" -an  output_SDR_422.mov

Thanks,
Mahesh
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