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4grayandClaude Opus 5.5
893c9d62a6
mpv's LUT scalers (the default lanczos/spline family) build their weight texture from an uninitialized talloc_array: mp_compute_lut fills only kernel->size of every stride floats, so each row's padding is heap garbage (reinit_scaler in video/out/gpu/video.c, mpv 0.41 and master). The LUT is an rgba16f texture sampled with linear filtering. When the padding holds NaN, or a value large enough to become Inf as half-float, Mesa's llvmpipe carries it through the zero-weight neighbour texel, the weights become NaN and the frame clamps to pure black. Whether it happens depends on heap contents, so the packaged smoke's paused frame was black in most attempts on the CI runner. Evidence from CI (8 repeats each, no retries): baseline 2/8 passed; LUT-free bilinear scalers 8/8; gpu-dumb-mode 8/8; LP_NUM_THREADS=1 6/8. A synchronous glReadPixels right after mpv_render_context_render() showed the black frame already in the helper's FBO. The readback, the shared-memory ring and the preload pump were correct. On a CPU rasterizer the helper now selects mpv's LUT-free bilinear scalers and disables sigmoid upscaling. Software GL cannot afford the LUT scalers anyway. A session option for the same key still wins. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>