[Cin] add Vulkan hwaccel

[Andrew Randrianasulu]

пт, 9 мая 2025 г., 16:02 Андрей Спицын via Cin <cin at lists.cinelerra-gg.org>:

> >I believe that filters are not
> accelerated even with standalone ffmpeg
>
> Some filters of standalone ffmpeg are hardware accelerated without vulkan.
>

but for using them programmatically in cingg we need pass around hw device
handle, and do manual format/hwupload/filter/hwdownload/format dance,
because otherwise libavcodec does not know where we want to filter, and
negotiation between different hw formats does not exist yet (?)

As you saw Paul said his lavfi-preview does not support this, may be OBS
does support?

I enabled opencl/vulkan filters in my build especially for testing this,
but so far no working solution found, with my weak understanding of both
C++ and ffmpeg functions.

Yes, hw acceleration currently for playback-only, and on render you can
select hw encoder, but data will roundtrip via system memory (and pcie bus
for discrete GPUs)


> Best regards,
> Andrey
>
> пт, 9 мая 2025 г., 15:59 Andrea paz via Cin <cin at lists.cinelerra-gg.org>:
>
>> > We have problem on input side, where hw decoding does not cooperate
>> with filters ....
>>
>> Maybe I didn't understand the problem: I thought that Hw acceleration
>> in timeline is only about playback. I believe that filters are not
>> accelerated even with standalone ffmpeg. In fact, there are few
>> filters built specifically for vulkan; are these the ones that don't
>> work for you?
>> During my tests I had managed to compile CinGG with the filters for
>> vulkan (it seems to me with a simple: “export FFMPEG_EXTRA_CFG=
>> --enable-vulkan”), but these did not work due to the classic errors
>> ("input/Output error", "invalid argument", etc).
>>
>> PS: among other tests, I failed to compile opencv (system) and opencl.
>> I have yet to try frei0r, lensfun and lcms2...
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>>
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