Unity截屏调ffmpeg生成视频

Download FFmpeg for Windows

Unity 代码

using System.Diagnostics;using System.IO;using UnityEngine;public class Test : MonoBehaviour{    private int width = 1280;    private int height = 720;    private Texture2D frame;    private float fireRate = 0.04F;    private float nextFire = 0.0F;    RenderTexture rt;    Rect rect;    byte[] bytes;    bool isReady = false;    int index = 0;    private string imagePath;    private string ffmpegPath;    private string videoPath;    // Use this for initialization    void Start()    {        Loom.Initialize();        imagePath = @Application.streamingAssetsPath + "/Images/";        ffmpegPath = @Application.streamingAssetsPath + "/ffmpeg/ffmpeg.exe";        videoPath = @Application.streamingAssetsPath + "/test.mp4";        if (!Directory.Exists(imagePath.TrimEnd('/')))         {            Directory.CreateDirectory(imagePath.TrimEnd('/'));        }         rect = new Rect(0, 0, width, height);        // 创建一个RenderTexture对象          rt = new RenderTexture(width, height, 0);        frame = new Texture2D(width, height, TextureFormat.RGBA32, false);        isReady = true;        //CreatVideo();    }    // Update is called once per frame    void Update()    {    }    private void FixedUpdate()    {        if (isReady && Time.time > nextFire)        {            nextFire = Time.time + fireRate;            CaptureCamera(Camera.main, index);            index++;        }    }    /// <summary>      /// 对相机截图。       /// </summary>      /// <returns>The screenshot2.</returns>      /// <param name="camera">Camera.要被截屏的相机</param>      /// <param name="rect">Rect.截屏的区域</param>      void CaptureCamera(Camera camera, int index)    {        // 临时设置相关相机的targetTexture为rt, 并手动渲染相关相机          camera.targetTexture = rt;        camera.Render();        //ps: --- 如果这样加上第二个相机，可以实现只截图某几个指定的相机一起看到的图像。          //ps: camera2.targetTexture = rt;          //ps: camera2.Render();          //ps: -------------------------------------------------------------------          // 激活这个rt, 并从中中读取像素。          RenderTexture.active = rt;        frame.ReadPixels(rect, 0, 0);// 注：这个时候，它是从RenderTexture.active中读取像素          frame.Apply();        // 重置相关参数，以使用camera继续在屏幕上显示          camera.targetTexture = null;        //ps: camera2.targetTexture = null;          RenderTexture.active = null; // JC: added to avoid errors          //// 最后将这些纹理数据，成一个png图片文件          bytes = frame.EncodeToJPG();        Loom.RunAsync(() =>        {            //string filename = Application.dataPath + "/Screenshot.png";            System.IO.File.WriteAllBytes(imagePath + index + ".jpg", bytes);            //Debug.Log(string.Format("截屏了一张照片: {0}", filename));          });    }    private void OnApplicationQuit()    {        CreatVideo();    }    void CreatVideo()    {        Loom.RunAsync(() =>        {            //建立外部调用进程            Process p = new Process();            p.StartInfo.FileName = ffmpegPath;            string args = "-f image2 -i " + imagePath + "%d.jpg -vcodec libx264 -r 25 " + videoPath;            p.StartInfo.Arguments = args;            p.StartInfo.UseShellExecute = false;//不使用操作系统外壳程序启动线程(一定为FALSE,详细的请看MSDN)            p.StartInfo.RedirectStandardError = true;//把外部程序错误输出写到StandardError流中(这个一定要注意,FFMPEG的所有输出信息,都为错误输出流,用StandardOutput是捕获不到任何消息的...)            p.StartInfo.CreateNoWindow = true;//不创建进程窗口            p.ErrorDataReceived += new DataReceivedEventHandler(Output);//外部程序(这里是FFMPEG)输出流时候产生的事件,这里是把流的处理过程转移到下面的方法中,详细请查阅MSDN            p.Start();//启动线程            p.BeginErrorReadLine();//开始异步读取            p.WaitForExit();//阻塞等待进程结束            p.Close();//关闭进程            p.Dispose();//释放资源            DirectoryInfo dir = new DirectoryInfo(imagePath);            dir.Delete(true);            Directory.CreateDirectory(imagePath.TrimEnd('/'));        });    }    private void Output(object sendProcess, DataReceivedEventArgs output)    {        if (!string.IsNullOrEmpty(output.Data))        {            //处理方法...            UnityEngine.Debug.Log(output.Data);        }    }}

Win10x64,Unity5.6.2f1x64 点击这里下载工程

参考文章

http://www.cnblogs.com/tianma3798/p/6285602.html

http://www.cnblogs.com/DHUtoBUAA/p/5551085.html