Ffmpeg not creating file running through .NET like when in CMD

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I am working on a small project that needs to use ffmpeg to pull out some video from the main video. I have called the following within a command prompt and get my 8 second video named correctly in the folder:

ffmpeg -ss 00:47:25 -t 8 -i C:\\Personal\\TestData\\MainVideo.mp4 -vcodec copy -acodec copy C:\\Personal\\TestData\\Portion1.mp4

However, when I try to run this from a Process.Start command it opens what looks like a command prompt, but doesn't save the file out.

var processn = Process.Start("CMD.exe", "/C ffmpeg -ss 00:47:25 -t 8 -i C:\\Personal\\TestData\\MainVideo.mp4 -vcodec copy -acodec copy C:\\Personal\\TestData\\Portion1.mp4");
                          processn.WaitForExit(50000);

I am out of ideas.
Thank you

What I have tried:

I have given full access to everyone on that folder.
I have tried calling the ffmpeg.exe directly and just pass in the parameter with no success.

var processStartInfo = new ProcessStartInfo(@"C:\FFmpeg\bin\ffmpeg.exe");
                        processStartInfo.WindowStyle = System.Diagnostics.ProcessWindowStyle.Hidden;
                        processStartInfo.Arguments = $"/C -ss 00:47:25 -t 8 -i C:\\Personal\\TestData\\MainVideo1.mp4 -vcodec copy -acodec copy C:\\Personal\\TestData\\Portion1.mp4";
                        processStartInfo.UseShellExecute = false;
                        processStartInfo.CreateNoWindow = true;

                        var processn = Process.Start(processStartInfo);
                        processn.EnableRaisingEvents = true;
                        processn.WaitForExit();

Posted 16-Aug-18 10:03am

Member 13948830

Updated 16-Aug-18 10:20am

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Member 13948830 · Answer 1 · 2018-08-16T10:20:00

This is what I did to finally get it to work

var processStartInfo = new ProcessStartInfo(@"C:\FFmpeg\bin\ffmpeg.exe");
processStartInfo.WindowStyle = System.Diagnostics.ProcessWindowStyle.Hidden;
processStartInfo.Arguments = $@"-ss {startTime} -t 8 -i C:\Personal\TestData\MainVideo.mp4 -vcodec copy -acodec copy C:\Personal\TestData\Portion{counter}.mp4";
processStartInfo.UseShellExecute = false;
processStartInfo.CreateNoWindow = true;
var processn = Process.Start(processStartInfo);