[FFmpeg-devel] [PATCH 00/15] OpenCL infrastructure, filters

[hydra3333 at gmail.com]

Most systems have a "clinfo" program which will list all the queryable 
properties of the available devices.

>From docs:

-init_hw_device type[=name][:device[,key=value...]]
    Initialise a new hardware device of type type called name, using the 
given device parameters. If no name is specified it will receive a default 
name of the form "type%d".

-filter_hw_device name
    Pass the hardware device called name to all filters in any filter graph.

So, either give it a name explicitly or deduce what the name will be:

-init_hw_device opencl=arbitrary_name:1.0 -filter_hw_device arbitrary_name

or

-init_hw_device opencl:1.0 -filter_hw_device opencl0

(There is some thought of adding an option -opencl_device working 
like -vaapi_device to avoid the two steps for simple upload.  The most 
useful cases all use device derivation/mapping to keep things on the GPU 
side, though, so I'm not entirely sure whether it's actually wanted.)

- Mark

----------------------------------------------

OK and Thank you, Mark.

One last question if I may,

> Most systems have a "clinfo" program which will list all the queryable 
> properties of the available devices.

In both of these cases
-init_hw_device opencl=arbitrary_name:1.0
-init_hw_device opencl:1.0

the device is seen to be "1.0" ... how does one determine that device "id" 
in Windows 10 in order to use it ?
(I have a another PC with intel graphics plus a 1050Ti and need to specify 
the 1050Ti)

I tried to use a clinfo command in DOS under Win10 ... but no go.
Display Adaptor properties didn't show anything obvious to an end-user.
GPU Caps Viewer didn't show anything useful.
ffmpeg -init_hw_device list showed
Supported hardware device types:
cuda
dxva2
qsv
d3d11va
opencl

Thank you.