Intial somewhat working version

README.md

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+# video-shader
+
+Milestone 1 is a Windows x64 native service that captures DeckLink video, processes frames as `RGBA16f` through a D3D11 HLSL shader, and outputs the processed image on the same DeckLink device.
+
+## Build
+
+```powershell
+cmake --preset windows-debug
+cmake --build --preset windows-debug
+```
+
+Run:
+
+```powershell
+.\build\windows-debug\Debug\video-shader.exe
+```
+
+Open `http://127.0.0.1:8080`.
+
+## Notes
+
+- The DeckLink SDK must remain at `3rdParty/Blackmagic DeckLink SDK 16.0`.
+- Milestone 1 captures video only. Audio is intentionally not routed yet.
+- The processing boundary is D3D11 `DXGI_FORMAT_R16G16B16A16_FLOAT`.
+- The current implementation uses an isolated CPU DeckLink bridge around the D3D11 processing core. The GPU Direct/D3D11 interop point is kept behind the frame bridge boundary for a later allocator-backed implementation.