[FFmpeg-user] A query on using the OpenCL tonemap filter from derived OpenCL device contexts from VAAPI.

Paul B Mahol onemda at gmail.com
Tue Nov 6 10:08:00 EET 2018

On 11/6/18, Dennis Mungai <dmngaie at gmail.com> wrote:
> Hello there,
> From this patchwork:
> https://git.ffmpeg.org/gitweb/ffmpeg.git/commit/8b8b0e2cd26cf1f522c630859fcbcc62b6493fb9
> It should be possible to utilize an OpenCL tonemap filter which does
> HDR(HDR10/HLG) to SDR conversion with tone-mapping, as shown in the example
> below:
> 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
> However, doing this results in a failure, shown below:
> Device creation failed: -38.
> Failed to set value 'opencl=ocl at va' for option 'init_hw_device': Function
> not implemented
> Platform details:
> I'm using the Intel Media driver built with the
> cl_intel_va_api_media_sharing OpenCL extension enabled. The OpenCL platform
> on the system is based on Neo:
> fmpeg -hide_banner -v verbose -init_hw_device opencl
> [AVHWDeviceContext @ 0x560d50e77140] 0.0: Intel(R) OpenCL HD Graphics /
> Intel(R) Gen9 HD Graphics NEO
> The Intel Media SDK is also installed, and can use both  QSV and
> VAAPI-based encoders in FFmpeg using the media-driver.
> How can I fix that issue above?

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