问题：

     Unity中实现播放透明的MP4视频时出现黑点

解决办法：

   使用Unity自带的shader去除黑点

1：shader代码如下所示

 

Shader "Unlit/NewUnlitShader"{	Properties	{		_Color("Color", Color) = (1,1,1,1)		//_MainTex ("Albedo (RGB)", 2D) = "white" {}  		_AlphaVideo("Alpha Video(R)", 2D) = "white" {}		_Glossiness("Smoothness", Range(0,1)) = 0.5		_Metallic("Metallic", Range(0,1)) = 0.0	}		SubShader		{		Tags { "Queue" = "Transparent" "RenderType" = "Transparent" }			LOD 200			CGPROGRAM			// Physically based Standard lighting model, and enable shadows on all light types  			#pragma surface surf Standard alpha  			// Use shader model 3.0 target, to get nicer looking lighting  			#pragma target 3.0  			sampler2D _MainTex;			sampler2D _AlphaVideo;			struct Input {				float2 uv_MainTex;				float2 uv_AlphaVideo;			};			half _Glossiness;			half _Metallic;			fixed4 _Color;			void surf(Input IN, inout SurfaceOutputStandard o) {				// Albedo comes from a texture tinted by color  				fixed4 c = tex2D(_MainTex, IN.uv_MainTex) * _Color;				fixed4 _alpha = tex2D(_AlphaVideo, IN.uv_AlphaVideo);				o.Albedo = c.rgb;				// Metallic and smoothness come from slider variables  				o.Metallic = _Metallic;				o.Smoothness = _Glossiness;				o.Alpha = _alpha.r;			}			ENDCG		}			FallBack "Diffuse"}

　　2：准备好格式为mp4的视频文件，并且提前下载安装好QuickTime，导入Unity当中，将视频文件由Videoclip改为MovieTexture

 

3：建立新的Material材质，将编写好的shader使用到材质中去，并将处理好的视频拖入当中

4：建立plane模型，X旋转90度,将建立好的材质拖到plane模型当中去，用代码控制视频的播放

5：控制代码如下所示：

using System.Collections;using System.Collections.Generic;using UnityEngine.UI;using UnityEngine;public class Juasd : MonoBehaviour {    public MovieTexture moveTex;    	// Use this for initialization	void Start () {        GetComponent
     
      ().material.mainTexture = moveTex;        moveTex.loop = true;        moveTex.Play();            }		// Update is called once per frame	void Update () {			}}