Unity帧序列实时渲染脚本

基于当前主相机的RenderTexture，好处是可以自定义分辨率等参数，脚本会输出品质为100的jpg序列，基本无损。

而用Application.CaptureScreenshot虽然可以录制包括OnGUI在内全部内容，但有是会png文件头损坏而无法输出视频，且分辨率不可设置

需要注意，unity不会按照渲染帧率来运行，如果是录制用来渲染需要另外写一个时间，用这个每帧间隔相等的时间驱动动画。

用管理员权限运行Unity，脚本挂在任意节点上，运行自动录制。

第二次运行自动删除之前录制的内容，重新录制

using UnityEngine;
using System.IO;

public class RealtimeScreenRecorder : MonoBehaviour
{
    public TextureFormat textureFormat = TextureFormat.RGB24;
    public int width = 1280;
    public int height = 720;

    [Header("Example D:/Test/Images/{0:0000}[{1}]")]
    public string savePath;

    Texture2D mTmpTexture2D;
    RenderTexture mRenderTexture;

    RenderTexture RenderTexture
    {
        get
        {
            if (mRenderTexture == null)
            {
                mRenderTexture = new RenderTexture(width, height, 24);
            }

            return mRenderTexture;
        }
    }

    Texture2D TmpTexture2D
    {
        get
        {
            if (mTmpTexture2D == null)
                mTmpTexture2D = new Texture2D(width, height, textureFormat, false);

            return mTmpTexture2D;
        }
    }

    public string FileSavePath
    {
        get
        {
            return string.Format(savePath + ".jpg", Time.frameCount, Time.time);
        }
    }

    void Start()
    {
        var outputPath = Path.GetDirectoryName(string.Format(savePath, 0, 0));
        if (!Directory.Exists(outputPath))
        {
            Directory.CreateDirectory(outputPath);
        }
        else
        {
            Directory.Delete(outputPath, true);
            Directory.CreateDirectory(outputPath);
            //clear old images.
        }
    }

    void Update()
    {
        if (Camera.main == null) return;

        RenderTexture.active = RenderTexture;
        Camera.main.targetTexture = RenderTexture;
        Camera.main.Render();

        TmpTexture2D.ReadPixels(new Rect(0, 0, width, height), 0, 0);
        TmpTexture2D.Apply();

        File.WriteAllBytes(FileSavePath, TmpTexture2D.EncodeToJPG(100));

        Camera.main.targetTexture = null;
        RenderTexture.active = null;
    }

    void OnDestroy()
    {
        RenderTexture.Release();
        DestroyObject(RenderTexture);
        DestroyObject(mTmpTexture2D);

        System.GC.Collect();
    }
}

RealtimeScreenRecorder.cs

录制效果，支持相机滤镜：