c# - 如何在 C# WPF 应用程序中获取 FFMPEG 转换进度到进度条？

Question

所以我使用下面的代码通过运行 ffmpeg 转换指定的文件，并且我需要在进度条中显示进度，所以我需要让它实时显示 cmd 输出到我的文本框让它被进度条显示，有什么帮助吗？

 private void convertbutton_Click(object sender, RoutedEventArgs e)
    {
        string resdir = AppDomain.CurrentDomain.BaseDirectory + "\\res";
        Extract("ADC", AppDomain.CurrentDomain.BaseDirectory + "\\res", "res", "ffmpeg.exe");

        string ffdir = AppDomain.CurrentDomain.BaseDirectory + "\\res\\ffmpeg.exe";
        string arg =  @"-y -activation_bytes ";
        string arg1 = @" -i ";
        string arg2 = @" -ab 80k -vn ";
        string abytes = bytebox.Text;
        string arguments = arg + abytes + arg1 + openFileDialog1.FileName + arg2 + saveFileDialog1.FileName;

        Process ffm = new Process();
        ffm.StartInfo.FileName = ffdir;
        ffm.StartInfo.Arguments = arguments;
        ffm.StartInfo.CreateNoWindow = true;
        ffm.StartInfo.RedirectStandardOutput = true;
        ffm.StartInfo.RedirectStandardError = true;
        ffm.StartInfo.UseShellExecute = false;
        ffm.StartInfo.WorkingDirectory = Directory.GetCurrentDirectory();
        ffm.Start();

        ffm.WaitForExit();
        ffm.Close();

        Directory.Delete(resdir, true);
    }

FFMPEG 输出通常如下所示:

size=    4824kB time=00:08:13.63 bitrate=  80.1kbits/s speed=  33x

Answer 1

您没有显示进度查看器的代码，但这是您获得 ffmpeg.exe 输出的方式和(仅相关部分):

Process ffm = new Process()
{
    RedirectStandardError = true,
    RedirectStandardOutput = true
};

ffm.OutputDataReceived += this.HandleOutputData;
ffm.ErrorDataReceived += this.HandleErrorData;

在这些方法中，您可以处理对 TextBox 的写入和观众:

private void HandleOutputData(object sender, DataReceivedEventArgs e)
{
    // The new data is contained in e.Data
    MyProgressViewer.Update(e.Data);
    this.myTextBox.Text += e.Data;
}

private void HandleErrorData(object sender, DataReceivedEventArgs e)
{
    // The new data is contained in e.Data
    MyProgressViewer.Update(e.Data);
    this.myTextBox.Text += e.Data;

    // Additional error handling here.
}

至于解析:显然，

ffmpeg now has a progress option, which gives output more easily parsed.

见 this answer更多细节。