[FFmpeg-user] Is libplacebo only for GPUs?

[Andrew Randrianasulu]

пт, 16 мая 2025 г., 09:16 Ferdi Scholten <ferdi at sttc-nlp.nl>:

>
>
> On 16-05-2025 01:33, Mark Filipak wrote:
> > On 15/05/2025 18.48, Ferdi Scholten wrote:
> >>> пт, 16 мая 2025 г., 00:12 Mark Filipak<markfilipak.imdb at gmail.com>:
> >>>
> >>>> On 15/05/2025 16.44, Carl Zwanzig wrote:
> >>>>> On 5/15/2025 1:33 PM, Mark Filipak wrote:
> >>>>>> What if I don't have a GPU?
> >>>>> Then you have a 25+ year old video card?
> >>>> Laptop
> >>>>
> >>>>> AFAIK all video chips for the last few decades have had
> >>>>> some form of GPU, although it may not be that useful or not
> >>>>> accessible
> >>>> for offload processing.
> >>>>
> >>>> FFmpeg says, "using cpu capabilities: MMX2 SSE2Fast SSSE3 SSE4.2 AVX"
> >>>> I guess "AVX" is a GPU? I have no idea.
> >>>>
> >>> no, just another cpu SIMD extension ....
> >>>
> >>> but llvmpipe/lavapipe (software Vulkan rasterizer) probably can use it.
> >>>
> >>>
> >>>
> >>>>> A better question might be "What if I don't have a supported GPU?"
> >>>> It's not a _better_ question, Carl, it's the _next_ question.
> >>>>
> >>>>
> >> Does anyone ever care to read documentation?
> >
> > Sure. Here: https://ffmpeg.org/ffmpeg-filters.html#libplacebo
> >
> >>
> >> libplacebo currently supports Vulkan (including MoltenVK), OpenGL,
> >> and Direct3D 11. It currently has the following minimum hardware
> >> requirements:
> >>
> >>   * *Vulkan*: Core version 1.2
> >>   * *OpenGL*: GLSL version >= 130 (GL >= 3.0, GL ES >= 3.0)
> >>   * *Direct3D*: Feature level >= 9_1
> >
> > Where did you find that text? Should I be looking somewhere else for
> > documentation?
> >
> >> Otherwise, if you have a laptop that was produced after 2010 its
> >> hardware almost certainly supports libplacebo in some way as the
> >> oldest of the hardware requirements being OpenGL 3.0 was supported by
> >> almost all video devices (either dedicated or built in the processor)
> >> of the time. OpenGL 3.0 was released in 2008.
> >
> > I run FFmpeg in Windows.
> >
> >> The same if you are on Windows, Direct3D Feature level 9_1 was
> >> released in 2008
> >
> > Intel Graphic and Media Control Panel makes no mention of Direct3D. I
> > believe that Direct3D is from Microsoft.
> >
> >> Vulkan is much more recent, version 1.2 is from 2020
> >>
> >> In other words for Intel based laptops, everything going back to
> >> Sandy Bridge has hardware support for libplacebo and for AMD based
> >> this goes back to the K10 series processors.
> >>
> >>  From the documentation:
> >> "
> >> In principle, libplacebo has no mandatory dependencies - only
> >> optional ones. However, to get a useful version of libplacebo. you
> >> most likely want to build with ...
> >
> > Build? Come down to Earth, friend. And again, where are you finding
> > your documentation?
> Libplacebo has it's own documentation that is where this info comes
> from, find it here: https://code.videolan.org/videolan/libplacebo (You
> find this exact link in the first line of the Libplacebo documentation
> of FFmpeg as well)
>
> Yes I build Libplacebo myself and use that build in FFmpeg (which I also
> build myself) and in other software such as Avidemux, VLC etc. and yes
> it does support OpenGL and Vulkan.



Can you share ffmpeg command where you use libplacebo over opengl?


I don't use Windows so I don 't build
> Libplacebo with DirectX support.
>
> Simply put, Libplacebo was created to be a hardware agnostic tool that
> uses whatever acceleration is available on the system it's running on to
> reach it's goal.
>
> That being said it still isn't a good idea to use it for HDR content on
> ancient hardware, it will be sluggishly slow.
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