EmguCV学习——视频与图片互转

其实视频转图片在上篇文章中已经有些眉目了，其实就是按帧读取视频，然后把帧保存就ok。然后自己再加个进度条美化一下。。。这代码简单易懂，还是直接上代码吧。

视频转图片

         /// <summary>
         /// 视频转换为图片
         /// </summary>
         /// <param name="path"></param>
         public void Video2Image(object path)
         {
             try
             {
                 //判断文件夹是否存在
                 if (!Directory.Exists(filepath + filename + "\\"))
                 {
                     try
                     {
                         //不存在 创建文件夹
                         Directory.CreateDirectory(filepath + filename + "\\");
                     }
                     catch { }
                 }

                 IntPtr CatchFrame = CvInvoke.cvCreateFileCapture(path.ToString());
                 // 得到总帧数
                 var count = CvInvoke.cvGetCaptureProperty(CatchFrame, Emgu.CV.CvEnum.CAP_PROP.CV_CAP_PROP_FRAME_COUNT);
                 // 视频宽度
                 int wd = (int)CvInvoke.cvGetCaptureProperty(CatchFrame, Emgu.CV.CvEnum.CAP_PROP.CV_CAP_PROP_FRAME_WIDTH);
                 // 视频高度
                 int hg = (int)CvInvoke.cvGetCaptureProperty(CatchFrame, Emgu.CV.CvEnum.CAP_PROP.CV_CAP_PROP_FRAME_HEIGHT);
                 //// 当前帧位置
                 //CvInvoke.cvGetCaptureProperty(CatchFrame, Emgu.CV.CvEnum.CAP_PROP.CV_CAP_PROP_POS_FRAMES);
                 //// 帧频
                 //CvInvoke.cvGetCaptureProperty(CatchFrame, Emgu.CV.CvEnum.CAP_PROP.CV_CAP_PROP_FPS);

                 IntPtr FrameImg;
                 int i = ;

                 IntPtr grayImg = CvInvoke.cvCreateImage(new Size(wd, hg), Emgu.CV.CvEnum.IPL_DEPTH.IPL_DEPTH_8U, );
                 while ((FrameImg = CvInvoke.cvQueryFrame(CatchFrame)) != IntPtr.Zero)
                 {
                     //此处我是转为灰度图，保存灰度图，小伙伴可以直接保存FrameImg
                     CvInvoke.cvCvtColor(FrameImg, grayImg, Emgu.CV.CvEnum.COLOR_CONVERSION.BGR2GRAY);

                     string picname = filepath + filename + "\\image" + (++i) + ".jpg";

                     CvInvoke.cvSaveImage(picname, grayImg, IntPtr.Zero);

                 }

             }
             catch (Exception ex)
             {
                 MessageBox.Show(ex.ToString());
             }

         }    

好吧，重要的是图片转视频，这里涉及到解码器。我需要转换的是mp4格式的视频，所以我选择的解码器为Xvid。

         /// <summary>
         /// 图片转换为视频
         /// </summary>
         public void Image2Video()
         {
             try
             {
                 var files = Directory.GetFiles(filepath, "*.jpg");
                 int count = files.Count();
                 int isColor = ;
                 //帧频
                 int fps = ;
                 int i = ;
                 string picname = files[];
                 Bitmap map = new Bitmap(picname);
                 int frameW = map.Width;
                 int frameH = map.Height;
                 string videoname = filepath + "\\out.mp4";
                 var writer = CvInvoke.cvCreateVideoWriter(videoname, CvInvoke.CV_FOURCC('X', 'V', 'I', 'D'), fps, new System.Drawing.Size(frameW, frameH), isColor);
                 map.Dispose();
                 CvInvoke.cvNamedWindow("mainWin");
                 while (i < count)
                 {
                     picname = files[i];
                     var img = CvInvoke.cvLoadImage(picname, Emgu.CV.CvEnum.LOAD_IMAGE_TYPE.CV_LOAD_IMAGE_ANYCOLOR);
                     if (img == null)
                     {
                         CvInvoke.cvReleaseImage(ref img);
                         continue;
                     }
                     CvInvoke.cvShowImage("mainWin", img);
                     bool flag = CvInvoke.cvWriteFrame(writer, img);
                     if (!flag)
                     {
                         CvInvoke.cvReleaseImage(ref img);
                         continue;
                     }
                     CvInvoke.cvWaitKey();
                     CvInvoke.cvReleaseImage(ref img);
                     i++;
                 }
                 CvInvoke.cvReleaseVideoWriter(ref writer);
                 CvInvoke.cvDestroyWindow("mainWin");
             }
             catch (Exception e)
             {
                 MessageBox.Show(e.ToString());
             }
         }            

That's all!

种一棵树最好的时间是十年前，其次是现在。