錄制桌面時如何停止ffmpeg將檔案保存到硬碟？

我正在嘗試使用 ffmpeg 錄制桌面并將視頻檔案保存到硬碟。

using System;
using System.Collections.Generic;
using System.Diagnostics;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace Testings
{
    internal class FFmpeg_Capture
    {
        Process process;

        public FFmpeg_Capture()
        {
            process = new Process();
        }

        public void Start(string FileName, int Framerate)
        {
            process.StartInfo.FileName = @"D:\Captured Videos\ffmpeg.exe"; // Change the directory where ffmpeg.exe is.  
            process.EnableRaisingEvents = false;
            process.StartInfo.WorkingDirectory = @"D:\Captured Videos"; // The output directory  
            process.StartInfo.Arguments = @"-f gdigrab -framerate "   Framerate  
                " -i desktop -preset ultrafast - pix_fmt yuv420p "   FileName;
            process.Start();
            process.StartInfo.UseShellExecute = false;
            process.StartInfo.CreateNoWindow = false;
            Stop();
        }

        public void Stop()
        {
            process.Close();
        }
    }
}

并在 form1 中使用它：

private void btnRecord_Click(object sender, EventArgs e)
        {
            recordToggle = !recordToggle;

            if (recordToggle)
            {
                btnRecord.Text = "Stop";
                record.Start("Testing", 60);
            }
            else
            {
                btnRecord.Text = "Record";
                record.Stop();
            }
        }

但檔案測驗從未保存到硬碟上。我的猜測是

process.Close();

不像 ctrl c 和 ctrl c 是停止 ffmpeg 并保存檔案的原因。

這是有效的，但如何洗掉 ffmpeg 的黑色視窗？

using System;
using System.Collections.Generic;
using System.Diagnostics;
using System.Drawing;
using System.IO;
using System.IO.Pipes;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;

namespace Testings
{
    internal class FFmpeg_Capture
    {
        Process process;

        public FFmpeg_Capture()
        {
            process = new Process();
        }

        public void Start(string FileName, int Framerate)
        {
            process.StartInfo.FileName = @"D:\Captured Videos\ffmpeg.exe"; // Change the directory where ffmpeg.exe is.  
            process.EnableRaisingEvents = false;
            process.StartInfo.WorkingDirectory = @"D:\Captured Videos\"; // The output directory  
            process.StartInfo.Arguments = @"-y -f gdigrab -framerate "   Framerate  
                " -i desktop -preset ultrafast -pix_fmt yuv420p "   FileName;
            process.StartInfo.UseShellExecute = false;
            process.StartInfo.CreateNoWindow = false;
            process.StartInfo.RedirectStandardInput = true; //Redirect stdin
            process.Start();
        }

        public void Stop()
        {
            byte[] qKey = Encoding.GetEncoding("gbk").GetBytes("q"); //Get encoding of 'q' key
            process.StandardInput.BaseStream.Write(qKey, 0, 1); //Write 'q' key to stdin of FFmpeg sub-processs
            process.StandardInput.BaseStream.Flush(); //Flush stdin (just in case).
            process.Close();
        }
    }
}

uj5u.com熱心網友回復：

當我們開始錄制時，會出現以下訊息：

按 [q] 停止，按 [?] 尋求幫助。

寫“q”stdin模擬q按鍵，并停止錄音。

• 使用以下命令啟動 FFmpeg 子行程RedirectStandardInput = true：

   process.StartInfo.RedirectStandardInput = true;
   process.Start();
  

• q將密鑰寫入stdinFFmpeg 子行程的管道：

   byte[] qKey = Encoding.GetEncoding("gbk").GetBytes("q");
   process.StandardInput.BaseStream.Write(qKey, 0, 1);
  

完整的代碼示例：

using System.Diagnostics;
using System.Text;

namespace Testings
{
    internal class FFmpeg_Capture
    {
        Process process;

        public FFmpeg_Capture()
        {
            process = new Process();
        }

        public void Start(string FileName, int Framerate)
        {
            process.StartInfo.FileName = @"C:\FFmpeg\bin\ffmpeg.exe"; // Change the directory where ffmpeg.exe is.  
            process.EnableRaisingEvents = false;
            process.StartInfo.WorkingDirectory = @"D:\"; // The output directory  
            process.StartInfo.Arguments = @"-y -f gdigrab -framerate "   Framerate  
                " -i desktop -preset ultrafast -pix_fmt yuv420p "   FileName;            
            process.StartInfo.UseShellExecute = false;
            process.StartInfo.CreateNoWindow = false;
            process.StartInfo.RedirectStandardInput = true; //Redirect stdin
            process.Start();
            System.Threading.Thread.Sleep(3000);  //Wait 3 seconds (for testing).
            Stop();
        }

        public void Stop()
        {
            byte[] qKey = Encoding.GetEncoding("gbk").GetBytes("q"); //Get encoding of 'q' key
            process.StandardInput.BaseStream.Write(qKey, 0, 1); //Write 'q' key to stdin of FFmpeg sub-processs
            process.StandardInput.BaseStream.Flush(); //Flush stdin (just in case).
            process.Close();
        }
    }

    class Program
    {
        static void Main(string[] args)
        {
            FFmpeg_Capture cap = new FFmpeg_Capture();
            cap.Start("vid.mp4", 5);
        }
    }
}

標籤：C＃ 表格 ffmpeg

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