将FFMPEG封装至C#开发的程序

 

唉 难搞哦，哪个FFMPEG.AutoGen资料实在是太少了,完全没法下手,不是不敢试 而是根本不知道哪里开始。

 

没办法 只好将官网编译好的EXE程序使用命令行的方式封装进去。

 

开始动手。

 

1.新建一个Winform项目.2.获取麦克风名称: 需要引用 NAudio

MMDeviceEnumerator enumberator = new MMDeviceEnumerator();
            MMDeviceCollection deviceCollection = enumberator.EnumerateAudioEndPoints(DataFlow.Capture, DeviceState.All);
            for (int waveInDevice = 0; waveInDevice < WaveIn.DeviceCount; waveInDevice++)
            {
                WaveInCapabilities deviceInfo = WaveIn.GetCapabilities(waveInDevice);
                foreach (MMDevice device in deviceCollection)
                {
                    if (device.FriendlyName.StartsWith(deviceInfo.ProductName))
                    {
                        comboBox2.Items.Add(device.FriendlyName);
                        break;
                    }
                }
            }

3.添加引用: System.Management

获取摄像头名称：

var searcher = new ManagementObjectSearcher("SELECT * FROM Win32_PnPEntity WHERE (PNPClass = 'Image' OR PNPClass = 'Camera')");
            foreach (var device in searcher.Get())            
                comboBox1.Items.Add(device["Caption"]);
            comboBox1.Items.Add("--桌面--");

将FFMPEG通过DOS执行 不显示DOS窗口,

/// <summary>
        /// 执行Cmd命令
        /// </summary>
        /// <param name="dosCommand">dosCmd</param>
        /// <returns></returns>
        public string Execute(string dosCommand)
        {
            Console.WriteLine(dosCommand);
            return Execute(dosCommand, 10);
        }
        /// <summary>
        /// 执行DOS命令，返回DOS命令的输出
        /// </summary>
        /// <param name="dosCommand">dos命令</param>
        /// <param name="milliseconds">等待命令执行的时间（单位：毫秒），
        /// 如果设定为0，则无限等待</param>
        /// <returns>返回DOS命令的输出</returns>
        string Execute(string command, int seconds)
        {
            string output = ""; //输出字符串
            if (command != null && !command.Equals(""))
            {
                Process process = new Process();                
                ProcessStartInfo startInfo = new ProcessStartInfo
                {
                    FileName = "cmd.exe",//设定需要执行的命令
                    //Arguments = command,//“/C”表示执行完命令后马上退出
                    UseShellExecute = false,//不使用系统外壳程序启动
                    RedirectStandardInput = true,//不重定向输入
                    RedirectStandardOutput = true, //重定向输出              
                    CreateNoWindow = true//不创建窗口
                };
                startInfo.WorkingDirectory=$@"{Application.StartupPath}\";
                process.StartInfo = startInfo;
                try
                {
                    if (process.Start())//开始进程
                    {
                        pid = process.Id;
                        process.StandardInput.WriteLine(command);
                    }
                }
                catch
                {
                    Process[] pro = Process.GetProcessesByName("ffmpeg");
                    foreach (Process p in pro) p.Kill();
                    if (pid > -1)
                        Process.GetProcessById(pid).Kill();
                }
                finally
                {
                    if (process != null)
                        process.Close();
                }
            }
            return output;
        }

执行的代码

 if (comboBox1.SelectedItem.ToString() == "--桌面--")
            {
                string cmd = "ffmpeg -f dshow -i audio=\"" + comboBox2.SelectedItem + "\" -f dshow -i audio=\"" + comboBox2.SelectedItem + "\" -filter_complex amix=inputs=2:duration=first:dropout_transition=2 -f gdigrab -i desktop  -vcodec libx264 -r 60.97 -b:v 1500K -codec:a aac -ac 2 -ar 44100  -pix_fmt yuv420p -tune zerolatency -preset ultrafast -f flv \"服务器推流地址";
                Execute(cmd);
            }
            else {
                string cmd = "ffmpeg -f dshow -i video=\""+ comboBox1.SelectedItem + "\":audio=\"" + comboBox2.SelectedItem + "\" -vcodec libx264 -r 25 -preset:v ultrafast -tune:v zerolatency -f flv \"服务器推流地址";
                Execute(cmd);
            }

退出的代码

//关闭FFMEPG进程
 Process[] pro = Process.GetProcessesByName("ffmpeg");
foreach (Process p in pro) p.Kill();
//关闭刚刚启动的dos进程
Process.GetProcessById(pid).Kill();

 

最终是能看到效果,没什么问题 .

bug是肯定有的，不过可以自行处理。