如何在C#中从ffmpeg进程获取输出 [英] How to get output from ffmpeg process in c#
问题描述
在WPF中编写的代码中,我在FFmpeg中运行了一些过滤器,如果我在终端中运行命令(PowerShell或cmd提示符),它将逐行为我提供信息.
In the code I written in WPF, I run some filter in FFmpeg, If I run the command in terminal (PowerShell or cmd prompt) It will give me information line by line what's going on.
我正在从C#代码中调用该过程,并且工作正常.我的代码存在的问题实际上是我无法从运行的进程中获取任何输出.
I am calling the process from C# code and it's work fine. The problem I have with my code is actually I am not able to get any output from the process I run.
我从FFmpeg进程的StackOverflow中尝试了一些答案.我在代码中看到了2个机会.我可以通过Timer方法修复它,或者再将事件挂接到OutputDataReceived.
I have tried some answers from StackOverflow for FFmpeg process. I see 2 opportunities in my code. I can either fix it by Timer approach or secondly hook an event to OutputDataReceived.
我尝试了OutputDataReceived事件,但我的代码无法正常工作.我尝试了Timer Approach,但是仍然没有达到我的代码.请检查下面的代码
I tried OutputDataReceived event, My code never got it worked. I tried Timer Approach but still, it's not hitting my code. Please check the code below
_process = new Process
{
StartInfo = new ProcessStartInfo
{
FileName = ffmpeg,
Arguments = arguments,
UseShellExecute = false,
RedirectStandardOutput = true,
RedirectStandardError = true,
CreateNoWindow = true,
},
EnableRaisingEvents = true
};
_process.OutputDataReceived += Proc_OutputDataReceived;
_process.Exited += (a, b) =>
{
System.Threading.Tasks.Task.Run(() =>
{
System.Threading.Tasks.Task.Delay(5000);
System.IO.File.Delete(newName);
});
//System.IO.File.Delete()
};
_process.Start();
_timer = new Timer();
_timer.Interval = 500;
_timer.Start();
_timer.Tick += Timer_Tick;
}
private void Timer_Tick(object sender, EventArgs e)
{
while (_process.StandardOutput.EndOfStream)
{
string line = _process.StandardOutput.ReadLine();
}
// Check the process.
}
推荐答案
ffmpeg似乎在StandardError而不是StandardOutput上输出状态更新.
ffmpeg seems to output status updates on StandardError rather than StandardOutput.
我设法使用以下代码从中获取更新:
I managed to get updates from it using the following code:
process = new Process
{
StartInfo = new ProcessStartInfo
{
FileName = ffmpeg,
Arguments = args,
UseShellExecute = false,
RedirectStandardOutput = true,
CreateNoWindow = false,
RedirectStandardError = true
},
EnableRaisingEvents = true
};
process.Start();
string processOutput = null;
while ((processOutput = process.StandardError.ReadLine()) != null)
{
// do something with processOutput
Debug.WriteLine(processOutput);
}
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