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docs(docker): explain why GPU Vulkan tonemap can't init in-container

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The libplacebo HDR->SDR tonemap needs a Vulkan device, but the nvidia
Vulkan ICD (libGLX_nvidia.so.0) pulls in libnvidia-glcore, which
references glibc malloc hooks removed in glibc 2.34 (__malloc_hook etc.)
and the Xorg symbol ErrorF. On any headless modern-glibc container these
go unresolved so vkCreateInstance returns VK_ERROR_INCOMPATIBLE_DRIVER
and the agent correctly falls back to the CPU zscale tonemap chain.
Document why we deliberately do NOT chase it (graphics cap + X11 libs +
1.4 loader + desktop glibc/Xorg, fragile + distro/driver coupled).
nvenc/nvdec (CUDA, not Vulkan) work regardless.
This commit is contained in:
Deivid Soto 2026-06-05 16:52:48 +02:00
parent 3a8c6ddd30
commit 3a8c466067
1 changed files with 13 additions and 0 deletions
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@ -41,6 +41,19 @@ FROM debian:bookworm-slim
# its ICD. ~150 KB. The agent only USES libplacebo after a functional
# probe (FFmpegSupportsLibplacebo) succeeds AND a real HW encoder is
# present, so this is inert on hosts without a working Vulkan GPU.
#
# NOTE: in this container libplacebo's Vulkan probe ALWAYS fails and the
# agent falls back to the CPU zscale tonemap chain — by design, not a
# bug. The nvidia Vulkan ICD is libGLX_nvidia.so.0, whose GL backend
# (libnvidia-glcore) references glibc malloc hooks removed in glibc 2.34
# (__malloc_hook/__free_hook/...) and the Xorg symbol ErrorF; on a
# headless modern-glibc base (debian or ubuntu) those go unresolved so
# vkCreateInstance returns VK_ERROR_INCOMPATIBLE_DRIVER. We deliberately
# do NOT chase it (would need `graphics` cap + X11 libs + a 1.4 loader
# AND a desktop-class glibc/Xorg — fragile, distro+driver coupled). The
# loader stays so that on the RARE host where Vulkan does come up the
# probe can use it. nvenc/nvdec (CUDA, not Vulkan) work regardless.
# GPU HDR tonemap is a bare-metal-binary feature, not a container one.
RUN apt-get update && \
apt-get install -y --no-install-recommends \
ca-certificates tzdata wget xz-utils par2 p7zip-full libvulkan1 && \