Stopping Process

anveshvm

I am using FFMPEG for streaming operations. (https://www.transferbigfiles.com/a3209f95-ffcc-4c82-b722-041a24c26ec1?rid=KsWHbP3Lo/rxGH4YHVVVtA%3D%3D) I started it using the following program

        Process myProcess = new Process();
        myProcess.StartInfo.FileName = @"ffmpeg.exe";
        myProcess.StartInfo.UseShellExecute = false;
        myProcess.StartInfo.RedirectStandardInput = true;

        myProcess.StartInfo.Arguments = "-i input.avi -vcodec copy -acodec copy output.avi";
        myProcess.Start();

        StreamWriter myStreamWriter = myProcess.StandardInput;

        myStreamWriter.Write("113"); //using ascii of q
        myStreamWriter.Flush();

        myStreamWriter.Write('q');
        myStreamWriter.Flush();

        myStreamWriter.Close();


        myProcess.WaitForExit();
        myProcess.Close();

My intention is to close the program when I send "q" from the program (I meant a graceful exit without making any error). But I can't close it by sending 'q' character or its corresponding ascii. When I run the program from the command line and I press q in the keyboard, program immediately gets closed. Can you pls. help me? Thank you regards anvesh

PIEBALDconsult

anveshvm wrote:

Can you pls. help me?

I believe so; see my ProcessCommunicator[^] article.

PIEBALDconsult

Come to think of it, you may only need to add a CARRIAGE-RETURN character.

anveshvm

Thanx for the reply, Its actually a nice article. But I couldn't solve my issue using it. A carriage return is not necessary for this application to close. Pressing a 'q' itself (from keyboard) will give give graceful end to the program. I need not press an additional enter key. And as an additional step of precaution, I made my own console program which requries a 'q' followed by carriage return to close the application, and it worked fine when I use WriteLine from .NET What might be the issue? Its only for ffmpeg that I can't send input stream to. I am anxious to know what might be the issue?

PIEBALDconsult

I don't know, I'm stumped. But maybe the program reads something internal instead of the input stream. What is ffmpeg? Maybe I can try it.

PIEBALDconsult

anveshvm wrote:

WriteLine

Oh, yeah, that may actually send a LINEFEED and a CARRIAGE-RETURN. If so, you would have to set the NewLine property.

anveshvm

ffmpeg produces libraries and programs for handling multimedia. We can convert media files into different formats using ffmpeg. It can also record live streams from a camera in different formats. I am attaching the ffmpeg.exe here. https://www.transferbigfiles.com/a3209f95-ffcc-4c82-b722-041a24c26ec1?rid=KsWHbP3Lo/rxGH4YHVVVtA%3d%3d[^] Here in my code i just copy the audio and video codecs of a file (input.avi) into another file(output.avi). Different parameters can be added in this command, but I just consider the basic operation here.

        Process myProcess = new Process();
        myProcess.StartInfo.FileName = @"ffmpeg.exe";
        myProcess.StartInfo.UseShellExecute = false;
        myProcess.StartInfo.RedirectStandardInput = true;

        myProcess.StartInfo.Arguments = "-i input.avi -vcodec flv -acodec copy output.flv";
        myProcess.Start();

        StreamWriter myStreamWriter = myProcess.StandardInput;

        myStreamWriter.Write("113"); //using ascii of q
        myStreamWriter.Flush();

        myStreamWriter.Write('q');
        myStreamWriter.Flush();

        myStreamWriter.Close();


        myProcess.WaitForExit();
        myProcess.Close()

;

If i run the pgm ( ffmpeg.exe should be placed in same foldr) it starts the conversion from avi to flv. When I press [q] the pgm gets closed gracefully. But I I am not being able to close it by sending 'q' character or its corresponding ascii. :confused: