How can I catch devices using ffmpeg and C#?

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I want to catch devices using ffmpeg.exe. i used Process class and related ffmpeg command but no success

What I have tried:

i used following code but the output is nothing!! i think it happens because the process exited as soon as process.start() executed. how can i do that?

C#

static void Main(string[] args)
    {
        ProcessStartInfo startInfo = new ProcessStartInfo();
        startInfo.CreateNoWindow = false;
        startInfo.UseShellExecute = false;
        startInfo.FileName = "ffmpeg.exe";
        startInfo.Arguments = "-list_devices true -f dshow -i dummy";
        startInfo.RedirectStandardOutput = false;


        try
        {
            using (Process process = Process.Start(startInfo))
            {
                while (!process.StandardOutput.EndOfStream)
                {
                    string line = process.StandardOutput.ReadLine();
                    Console.WriteLine(line);
                }

                process.WaitForExit();
            }
        }
        catch (Exception ex)
        {
            Console.WriteLine(ex.Message);
        }

        Console.ReadKey();
    }
}

Posted 26-Oct-17 2:31am

hsafavi

Updated 26-Oct-17 2:58am

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Graeme_Grant · Answer 1 · 2017-10-26T02:58:00

Solution 1

You want to "capture" the output? This should answer your question: Capturing console output from a .NET application (C#) - Stack Overflow[^]

Posted 26-Oct-17 2:58am

Graeme_Grant

Comments

hsafavi 26-Oct-17 9:09am

no it doesn't work. process.StandardOutput.ReadToEnd() result is a empty string. i think because process exited

Graeme_Grant 26-Oct-17 9:22am

Did you try using it the way they describe? The solution was accepted, so it should work. startInfo.RedirectStandardOutput, according to the linked solution, indicated that it needs to be set to true, not false.

hsafavi 26-Oct-17 9:51am

I did but no success

Graeme_Grant 26-Oct-17 9:56am

There is more than one answer on that link provided... Did you look at the solution beneath it? Solution by ShitalShah[^]

hsafavi 27-Oct-17 9:57am

no success again

El Bunda7 · Answer 2 · 2024-02-01T01:26:00

I had the same issue. I was redirecting the standard output, but FFmpeg outputs text messages to the standard error.

C#

static void Main(string[] args)
    {
        ProcessStartInfo startInfo = new ProcessStartInfo();
        startInfo.CreateNoWindow = false;
        startInfo.UseShellExecute = false;
        startInfo.FileName = "ffmpeg.exe";
        startInfo.Arguments = "-hide_banner -list_devices true -f dshow -i dummy";
        startInfo.RedirectStandardError = true;

        try
        {
            using (Process process = Process.Start(startInfo))
            {
                while (!process.StandardError.EndOfStream)
                {
                    string line = process.StandardError.ReadLine();
                    Console.WriteLine(line);
                }

                process.WaitForExit();
            }
        }
        catch (Exception ex)
        {
            Console.WriteLine(ex.Message);
        }

        Console.ReadKey();
    }
}

Tip: use -hide_banner in ffmpeg argument and your next step will be easier :-)

I hope it helps someone.