[FFmpeg-devel] [PATCH v4 1/2] lavfi: add opencl tonemap filter.

[Moritz Barsnick]

On Tue, Jun 19, 2018 at 09:57:31 +0800, Ruiling Song wrote:
> As I didn't receive any other comment on v3, this version only fix the comment from Michael.
> And also include some little change to leverage CL_SET_KERNEL_ARG() macro.

Could you kindly add some documentation to doc/filters.texi, at least
describing the filter's options?

> This filter does HDR(HDR10/HLG) to SDR conversion with tone-mapping.
> 
> An example command to use this filter with vaapi codecs:
> FFMPEG -init_hw_device vaapi=va:/dev/dri/renderD128 -init_hw_device \
> opencl=ocl at va -hwaccel vaapi -hwaccel_device va -hwaccel_output_format \
> vaapi -i INPUT -filter_hw_device ocl -filter_complex \
> '[0:v]hwmap,tonemap_opencl=t=bt2020:tonemap=linear:format=p010[x1]; \
> [x1]hwmap=derive_device=vaapi:reverse=1' -c:v hevc_vaapi -profile 2 OUTPUT

This could also go into the documentation.

Thanks,
Moritz