Sunshine segfaults (exit 139, crash loop) probing the Vulkan H.264 encoder on the BC-250 — the GPU has no VCN/video-encode hardware and the failed probe crashes instead of falling through. Software x264 is the only viable encoder on this chip anyway. Seeded only if no config exists, so user edits are never overwritten. Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>