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
代码语言：javascript复制 1 /// <summary>
2 /// 视频转换为图片
3 /// </summary>
4 /// <param name="path"></param>
5 public void Video2Image(object path)
6 {
7 try
8 {
9 //判断文件夹是否存在
10 if (!Directory.Exists(filepath filename "\"))
11 {
12 try
13 {
14 //不存在 创建文件夹
15 Directory.CreateDirectory(filepath filename "\");
16 }
17 catch { }
18 }
19
20 IntPtr CatchFrame = CvInvoke.cvCreateFileCapture(path.ToString());
21 // 得到总帧数
22 var count = CvInvoke.cvGetCaptureProperty(CatchFrame, Emgu.CV.CvEnum.CAP_PROP.CV_CAP_PROP_FRAME_COUNT);
23 // 视频宽度
24 int wd = (int)CvInvoke.cvGetCaptureProperty(CatchFrame, Emgu.CV.CvEnum.CAP_PROP.CV_CAP_PROP_FRAME_WIDTH);
25 // 视频高度
26 int hg = (int)CvInvoke.cvGetCaptureProperty(CatchFrame, Emgu.CV.CvEnum.CAP_PROP.CV_CAP_PROP_FRAME_HEIGHT);
27 //// 当前帧位置
28 //CvInvoke.cvGetCaptureProperty(CatchFrame, Emgu.CV.CvEnum.CAP_PROP.CV_CAP_PROP_POS_FRAMES);
29 //// 帧频
30 //CvInvoke.cvGetCaptureProperty(CatchFrame, Emgu.CV.CvEnum.CAP_PROP.CV_CAP_PROP_FPS);
31
32 IntPtr FrameImg;
33 int i = 0;
34
35 IntPtr grayImg = CvInvoke.cvCreateImage(new Size(wd, hg), Emgu.CV.CvEnum.IPL_DEPTH.IPL_DEPTH_8U, 1);
36 while ((FrameImg = CvInvoke.cvQueryFrame(CatchFrame)) != IntPtr.Zero)
37 {
38 //此处我是转为灰度图，保存灰度图，小伙伴可以直接保存FrameImg
39 CvInvoke.cvCvtColor(FrameImg, grayImg, Emgu.CV.CvEnum.COLOR_CONVERSION.BGR2GRAY);
40
41 string picname = filepath filename "\image" ( i) ".jpg";
42
43 CvInvoke.cvSaveImage(picname, grayImg, IntPtr.Zero);
44
45 }
46
47 }
48 catch (Exception ex)
49 {
50 MessageBox.Show(ex.ToString());
51 }
52
53 } 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。
代码语言：javascript复制 1 /// <summary>
2 /// 图片转换为视频
3 /// </summary>
4 public void Image2Video()
5 {
6 try
7 {
8 var files = Directory.GetFiles(filepath, "*.jpg");
9 int count = files.Count();
10 int isColor = 1;
11 //帧频
12 int fps = 5;
13 int i = 0;
14 string picname = files[0];
15 Bitmap map = new Bitmap(picname);
16 int frameW = map.Width;
17 int frameH = map.Height;
18 string videoname = filepath "\out.mp4";
19 var writer = CvInvoke.cvCreateVideoWriter(videoname, CvInvoke.CV_FOURCC('X', 'V', 'I', 'D'), fps, new System.Drawing.Size(frameW, frameH), isColor);
20 map.Dispose();
21 CvInvoke.cvNamedWindow("mainWin");
22 while (i < count)
23 {
24 picname = files[i];
25 var img = CvInvoke.cvLoadImage(picname, Emgu.CV.CvEnum.LOAD_IMAGE_TYPE.CV_LOAD_IMAGE_ANYCOLOR);
26 if (img == null)
27 {
28 CvInvoke.cvReleaseImage(ref img);
29 continue;
30 }
31 CvInvoke.cvShowImage("mainWin", img);
32 bool flag = CvInvoke.cvWriteFrame(writer, img);
33 if (!flag)
34 {
35 CvInvoke.cvReleaseImage(ref img);
36 continue;
37 }
38 CvInvoke.cvWaitKey(20);
39 CvInvoke.cvReleaseImage(ref img);
40 i ;
41 }
42 CvInvoke.cvReleaseVideoWriter(ref writer);
43 CvInvoke.cvDestroyWindow("mainWin");
44 }
45 catch (Exception e)
46 {
47 MessageBox.Show(e.ToString());
48 }
49 } That's all!
种一棵树最好的时间是十年前，其次是现在。
