如何停止ffmpeg的视频在c＃记录？ [英] How to stop ffmpeg video recording in c#?

问题描述

我使用的FFmpeg的应用程序，它开始和录制视频完美
，但是当我想阻止它要求按Q，我得到了System.EntryPointNotFoundException的错误消息。

我怎么能发送短信q来处理这是在运行从应用程序的状态

  INT key_q = 81; 
 
函数[DllImport（user32.dll中，入口点=PostMessage的）] 
私人静态的extern BOOL PostMessage的（HWND的IntPtr，UINT味精，诠释WPARAM，LPARAM INT）; 
 
 
 
私人无效button_stop_Click（对象发件人，EventArgs五）
 {
串过程=的ffmpeg; 
 
过程[] =亲Process.GetProcessesByName（FFMPEG）; 
 
亲[0] .REFRESH（）; 
 
 IntPtr的H =亲[0] .MainWindowHandle; 
 
 
 
 PostMessage的（H，为0x100，key_q，0）; 
 
 
} 
  

解决方案

如果您创建的过程中开始，你可以把手保持它的标准输入并发送q（可能还需要发送一个\\\
后）。

如果你没有，那么你可以一些第三方的.exe（或内部等效）向它发送一个CTRL + C / Ctrl + Break其进程ID。

FFmpeg的没有一个窗口句柄，因为它是一个控制台应用程序，所以你不能把它与PostMessage的等按键。只有通过控制台信号（即CTRL + C /休息）

I am using FFmpeg in application and it start and record video perfectly but when I want to stop it ask for press "q", I got a System.EntryPointNotFoundException Error message.

How can I send message "q" to process which is in running state from application

    int key_q = 81; 

    [DllImport("user32.dll", EntryPoint = "postmessage")]       
    private static extern bool postmessage(IntPtr hwnd, uint msg, int wparam, int lparam);



    private void button_stop_Click(object sender, EventArgs e)
    {
          string process = "ffmpeg";

          Process[] pro = Process.GetProcessesByName("ffmpeg");

          pro[0].Refresh();

          IntPtr h = pro[0].MainWindowHandle;



          postmessage(h, 0x100, key_q, 0);


    }

解决方案

If you created the process initially, you can keep a handle to its stdin and send it "q" (possibly need to also send it a "\n" after).

If you didn't, then you could some third party .exe (or an internal equivalent) to send it a ctrl+c/ctrl+break to its process ID.

FFmpeg doesn't have a window handle since it's a console app, so you can't send it keystrokes with PostMessage et al. only through console signals (i.e. ctrl+c/break)

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