vault backup: 2024-10-16 12:45:55

02-Note/DAWA/ASoul/流程笔记/VJ播放.md

@@ -146,4 +146,44 @@ UNDIMediaReceiver::CaptureConnectedVideo
 =>
 DisplayFrame    NDIlib_frame_format_type_progressive    NDIlib_FourCC_video_type_UYVY
 =>
-DrawProgressiveVideoFrame
+DrawProgressiveVideoFrame
+
+## 解决方案
+[NDI plugin质量问题](https://forums.unrealengine.com/t/ndi-plugin-quality-trouble/1970097)
+
+I changed only shader “NDIIO/Shaders/Private/NDIIOShaders.usf”.
+For example function **void NDIIOUYVYtoBGRAPS (// Shader from 8 bits UYVY to 8 bits RGBA (alpha set to 1)):**
+
+_WAS:_
+
+```c++
+float4 UYVYB = NDIIOShaderUB.InputTarget.Sample(NDIIOShaderUB.SamplerB, InUV);
+float4 UYVYT = NDIIOShaderUB.InputTarget.Sample(NDIIOShaderUB.SamplerT, InUV);
+float PosX = 2.0f * InUV.x * NDIIOShaderUB.InputWidth;
+float4 YUVA;
+float FracX = PosX % 2.0f;
+YUVA.x = (1 - FracX) * UYVYT.y + FracX * UYVYT.w;
+YUVA.yz = UYVYB.zx;
+YUVA.w = 1;
+```
+
+_I DID:_
+
+```c++
+float4 UYVYB = NDIIOShaderUB.InputTarget.Sample(NDIIOShaderUB.SamplerB, InUV);
+float4 UYVYT0 = NDIIOShaderUB.InputTarget.Sample(NDIIOShaderUB.SamplerT, InUV + float2(-0.25f / NDIIOShaderUB.InputWidth, 0));
+float4 UYVYT1 = NDIIOShaderUB.InputTarget.Sample(NDIIOShaderUB.SamplerT, InUV + float2(0.25f / NDIIOShaderUB.InputWidth, 0));
+float PosX = 2.0f * InUV.x * NDIIOShaderUB.InputWidth;
+float4 YUVA;
+float FracX = (PosX % 2.0f) * 0.5f;
+YUVA.x = (1 - FracX) * UYVYT1.y + FracX * UYVYT0.w;
+YUVA.yz = UYVYB.zx;
+YUVA.w = 1;
+```
+
+Small changes but result is seems much more better.
+Of course, I added a bit of sharpness to the material after I changed the shader, but even without that, the result looks better than in the original version.
+## UYVY（YUV422）
+- https://zhuanlan.zhihu.com/p/695302926
+- https://blog.csdn.net/gsp1004/article/details/103037312
+![](https://i-blog.csdnimg.cn/blog_migrate/24b41fd36ff7902670e11a8005afb370.jpeg)