cmd windows not showing output

问题

I'm having an issue where my cmd windows is just blank when executed from code. I've searched here and there for some solutions. And tried a few different things myself.

Running it with a normal .bat file works just fine.. But just not from my C# application.

Note: the ffmpeg is being run perfectly, but just not showing anything in the cmd window when executed from code.

image at the bottom. I'll update this if I find a solution.. Unless you guys do it first ;)

Code:

      private async void RunFfmpeg()
    {
        await Task.Run(() =>
        {
        String destFolder = null;
        String sourceFolder = null;
        int listCount = 0;

        this.Dispatcher.Invoke(() =>
        {
            destFolder = textDest.Text;
            sourceFolder = textSource.Text;
            listCount = listFiles.Items.Count;
        });



        foreach (FileInfo fileC in listFiles.Items)
        {
            //Changing old extension to mp4
            string oldFileName = fileC.ToString();
            string newFileName = null;

            string[] extension = oldFileName.Split('.');

            newFileName = extension[0] + ".mp4";

            string newDir = destFolder + "\\" + extension[0];
            DirectoryInfo createDir = new DirectoryInfo(newDir);

            if (!createDir.Exists)
            {
                createDir.Create();
            }

            //Gathering folders and all I need...
            string output = "\"" + destFolder + "\\" + extension[0] + "\\" + newFileName + "\"";
            string input = "\"" + sourceFolder + "\\" + oldFileName + "\"";

                var startInfo = new System.Diagnostics.ProcessStartInfo
                {
                    FileName = "cmd.exe",
                    //Arguments = $"-i {input} {output}",
                    Arguments = $"/c ffmpeg -i {input}" + " -c:a copy -c:v copy " + $"{output}",
                    UseShellExecute = false,
                    RedirectStandardOutput = true,
                    CreateNoWindow = false,
                    WorkingDirectory = Directory.GetCurrentDirectory()
                };
                Process p = new Process();
                p.StartInfo = startInfo;
                p.OutputDataReceived += P_OutputDataReceived;
                p.Start();
                p.WaitForExit();
            }
        });
    }

Here is where I read the output:

        private void P_OutputDataReceived(object sender, DataReceivedEventArgs e)
    {
        this.Dispatcher.Invoke(() =>
        {
            //string cmdBox = cmdOutput.Text;
            //cmdOutput.AppendText(cmdBox);
            //cmdOutput.Clear();
            cmdOutput.AppendText(e.Data);
        });
    }

Images showing blank cmd

来源：https://stackoverflow.com/questions/55245315/cmd-windows-not-showing-output

标签

cmd