C＃从MP4流中提取位图

Question

最近，我在互联网上搜索了很多不错的C＃库以从MP4视频中提取位图，但发现与该代码相似但与MP4类似的东西：

        VideoStream stream = aviManager.GetVideoStream(@"C:\Users\User\Desktop\video.mp4");
        //the video.mp4 is usually .avi or .mpeg
        for (int n = 0; n < stream.CountFrames; n++)
        {
            Bitmap bmp = new Bitmap(stream.GetBitmap(Position));
            bmp.Save(@"C:\Users\Nehoray\Desktop\Something.png");
            bmp.Dispose;
        }

谁能给我一个像这样的简单代码的库，仅用于MP4？:)

Answer 1

对于 avi 我曾经写过这样的东西：

string filename = "file.avi";
string storagepath = @"temp\";
static int counter = 0;
MediaDetClass memde;

private void button1_Click(object sender, EventArgs e)
{
    if (openFileDialog1.ShowDialog() == System.Windows.Forms.DialogResult.OK)
    {
        // Create the subfolder
        System.IO.Directory.CreateDirectory("temp");

    // Some properities
        counter = 0;
        memde = new MediaDetClass();
        Image img;
        memde.Filename = openFileDialog1.FileName;
        memde.CurrentStream = 0;
        int len = (int)memde.StreamLength;
        float percent = 0.002f;//how far do u want for a single step

        for (float i = 0.0f; i < len; i = i + (float)(percent * len))
        {

            counter++;
            string fbitname = storagepath + counter.ToString();
            memde.WriteBitmapBits(i, 850, 480, fbitname + ".bmp");
            //img = Image.FromFile(fbitname + ".bmp");
            //img.Save(fbitname + ".bmp", ImageFormat.Bmp);
            //img.Dispose();
            //System.IO.File.Delete(i + fbitname + ".bmp");
        }
}

使用的库是：Interop.DexterLib.dll，我现在不确定您是否可以在 C# 资源中找到它。如果您愿意，我可以分享链接。

GitHub Repo只需下载 RAW 文件（位于 C# 文件夹中）。