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Fix excessive latency with Vulkan video decoding on Nvidia

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For yet unknown reasons, high frame queue delay leads to massive decode latency.
This commit is contained in:
Cameron Gutman 2024-09-16 21:59:17 -05:00
parent 1caee721e8
commit f786e94c7b
1 changed files with 11 additions and 0 deletions
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11
app/streaming/video/ffmpeg-renderers/plvk.cpp
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@ -661,11 +661,16 @@ void PlVkRenderer::waitToRender()
return; return;
} }
#ifndef Q_OS_WIN32
// With libplacebo's Vulkan backend, all swap_buffers does is wait for queued // With libplacebo's Vulkan backend, all swap_buffers does is wait for queued
// presents to finish. This happens to be exactly what we want to do here, since // presents to finish. This happens to be exactly what we want to do here, since
// it lets us wait to select a queued frame for rendering until we know that we // it lets us wait to select a queued frame for rendering until we know that we
// can present without blocking in renderFrame(). // can present without blocking in renderFrame().
//
// NB: This seems to cause performance problems with the Windows display stack
// (particularly on Nvidia) so we will only do this for non-Windows platforms.
pl_swapchain_swap_buffers(m_Swapchain); pl_swapchain_swap_buffers(m_Swapchain);
#endif
// Handle the swapchain being resized // Handle the swapchain being resized
int vkDrawableW, vkDrawableH; int vkDrawableW, vkDrawableH;
@ -818,6 +823,12 @@ void PlVkRenderer::renderFrame(AVFrame *frame)
goto UnmapExit; goto UnmapExit;
} }
#ifdef Q_OS_WIN32
// On Windows, we swap buffers here instead of waitToRender()
// to avoid some performance problems on Nvidia GPUs.
pl_swapchain_swap_buffers(m_Swapchain);
#endif
UnmapExit: UnmapExit:
// Delete any textures that need to be destroyed // Delete any textures that need to be destroyed
for (pl_tex texture : texturesToDestroy) { for (pl_tex texture : texturesToDestroy) {