пт, 16 мая 2025 г., 19:26 Ferdi Scholten <fe...@sttc-nlp.nl>: > > Can you share ffmpeg command where you use libplacebo over opengl? > > > > > > > No, there is no such command because that is not how libplacebo is meant > to work. Libplacebo uses the hardware abstractions that are available, > it is not possible to specify which backend to use. It takes the best > one available for the job depending on the hardware capabilities. > Ultimately resorting to the dummy (cpu/software encoding) backend if > there is no gpu capable of doing the job with OpenGL, Vulkan or DirectX. > > Again from the libplacebo documentation: > > "Every attempt was made to provide these features at a *high level of > abstraction*, taking away all the messy details of GPU programming, > color spaces, obscure subsampling modes, image metadata manipulation, > and so on." >
Well, to be honest I only imagined there *might* be way to use libplacebo on non-vulkan capable hardware by playing video with mpv (that can use libplacebo via opengl/directx for stuff like tonemapping and scaling) and capture mpv's output by screen capture program. But as you can imagine this brings question about dropped frames. I looked into mpv on Windows 7 and there seems to be build or two still capable of running on suc OS, see https://github.com/mpv-player/mpv/issues/13093 more specifically build from https://github.com/eko5624/mpv-win64/releases/tag/2024-04-29 and project I never heard before: https://github.com/i486/VxKex sort of compat layer for running *some* win10 software on Win7SP1 And there is also Jellyfin-ffmpeg and its SIMD Accelerated tonemapX ffmpeg filter: https://github.com/jellyfin/jellyfin-ffmpeg see patches in debian folder. I tried few vulkan/vaapi related but they not fixed lack of interoperability between Vulkan filtering and vaapi *encoding* on my RX550. I looked at why and it seems GFX8 gpus like my Polaris12 can't do drm modifiers, required for inter-API surface/buffer sharing. Hw might be capable, but whole topic is complex and no support appeared since 2018 (when this card was new) so today's chances of this code materializing seem to be low? No Vulkan encoding either. May be this will materialize at some time in future. So I have all hardware blocks to do full gpu transcode *with tonemaping*, yet graphical APIs in connection with specific Linux drivers for this specific card simply does not allow me to utilize full power of hardware. May be on Windows situation is (or was) different. _______________________________________________ > ffmpeg-user mailing list > ffmpeg-user@ffmpeg.org > https://ffmpeg.org/mailman/listinfo/ffmpeg-user > > To unsubscribe, visit link above, or email > ffmpeg-user-requ...@ffmpeg.org with subject "unsubscribe". > _______________________________________________ ffmpeg-user mailing list ffmpeg-user@ffmpeg.org https://ffmpeg.org/mailman/listinfo/ffmpeg-user To unsubscribe, visit link above, or email ffmpeg-user-requ...@ffmpeg.org with subject "unsubscribe".
