Ffmpeg output log in text file using C#

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This is a simple code to create ffmpeg log output in a file instead of console.

But this code doesn't create an output log file wherein the same arrangements when used in command prompt it works. Can anybody help in this? what more needs to be done to get the output in the log file?

Regards Arunava

What I have tried:

<pre>string fullPath = "d:";
        string fileName= "wildlife.wmv";
        string pathfile = "D:";
        process.StartInfo.Arguments = "-i \"" + fullPath + "\" + fileName + +\" 2> \"" + pathfile + "\ffmpeglog.log\"";

        process.StartInfo.UseShellExecute = false;
        process.StartInfo.RedirectStandardError = true;
        process.StartInfo.CreateNoWindow = false;
        process.StartInfo.WindowStyle = ProcessWindowStyle.Hidden;
        process.Start();
        string output2 = process.StandardError.ReadToEnd();
        process.WaitForExit();
        process.Close();

Posted 7-Nov-17 22:06pm

arunavachowdhury

Updated 9-Nov-17 1:50am

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Richard MacCutchan · Answer 1 · 2017-11-08T00:53:00

A quick check with your debugger would show you that your parameters are wrong as you have unescaped backslashes in your strings. So the code:

C#

string fullPath = "d:";
        string fileName= "wildlife.wmv";
        string pathfile = "D:";
        process.StartInfo.Arguments = "-i \"" + fullPath + "\" + fileName + +\" 2> \"" + pathfile + "\ffmpeglog.log\"";

results in the string:

process.StartInfo.Arguments =  -i "d:" + fileName + +" 2> "D:fmpeglog.log"

It should be:

C#

process.StartInfo.Arguments = "-i \"" + fullPath + "\\" + fileName + "\" 2> \"" + pathfile + "\\ffmpeglog.log\"";

arunavachowdhury · Answer 2 · 2017-11-09T01:50:00

Tried with the above code but its not working. When we run ffmpeg with the same code we need to remove the final "\" after ffmpeglog.log to generate the log.
When I am using

" -i \"d:\\wildlife.wmv 2> \"D:\\ffmpeglog.log\""

The log is not generating but cannot remove the "\" from the string since its throwing Newline constant error.

How can I use

" -i \"d:\\wildlife.wmv 2> \"D:\\ffmpeglog.log""

instead of the previous code. Or we need to make some changes in the configuration? Current configuration is as follows.

startProcess.CreateNoWindow = true;
           startProcess.ErrorDialog = false;
           startProcess.UseShellExecute = false;
           startProcess.RedirectStandardOutput = true;
           //startProcess.RedirectStandardError = false;
           startProcess.RedirectStandardError = true;
           startProcess.RedirectStandardInput = true;

Please advise.

Ffmpeg output log in text file using C#

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