Converting audio/video tracks to AAC format in C# app.

[Alex1347]

I try convert audio/video tracks to AAC format using qaac lib. In CMD it works and output information about progress of convertation. In my C# app it works too, but I can't get information about progress, i try use these events: OutputDataReceived, ErrorDataReceived. In handler of ErrorDataReceived I don't get needed information, in handler of OutputDataReceived I get received.Data like null value. How can I get conversion progress information during conversion in C# code?

(I use qaac lib because ffmpeg lib convert tracks to AAC incorrect - incorrect duration of result track, resolving not find for this problem, some analog apps have the same bug.)

string arguments = $"\"{engineParameters.InputFile.Filename}\" -no-delay -o \"{engineParameters.OutputFile.Filename}\"";

processStartInfo = new ProcessStartInfo
{
    FileName = QaacFilePath,
    Arguments = arguments,
    RedirectStandardOutput = true,
    UseShellExecute = false,
    CreateNoWindow = true,
    WindowStyle = ProcessWindowStyle.Hidden
};

Also i call these methods for process:

BeginOutputReadLine();
BeginErrorReadLine();
WaitForExit();

Handlers:

this.Process.OutputDataReceived += (sender, received) =>
{
    if (received.Data == null) return;
    //Some code...
}

this.Process.ErrorDataReceived += (sender, received) =>
{
    if (received.Data == null) return;
    //Some code...
}

 

[Skydiver]

If "qaac lib" is truly a library, why don't you just PInvoke the APIs of the library directly? I have a feeling based on a quick scan of the documentation links that "qaac" is actually a "prog" or "cli" and not a "lib".