Foro de elhacker.net

 ProcessStartInfo startInfo = new ProcessStartInfo("D:\\..\\ffmpeg\\ff-prompt.bat");
            startInfo.WindowStyle = ProcessWindowStyle.Minimized;
            startInfo.UseShellExecute = false;
            startInfo.RedirectStandardInput = true;
 
            startInfo.Arguments = "ffmpeg -i Wildlife.wmv -qscale 4 -vcodec mjpeg -acodec pcm_s16le salida.avi";
 
            Process.Start(startInfo);

@ECHO OFF
REM FF Prompt 1.2
REM Open a command prompt to run ffmpeg/ffplay/ffprobe
REM Copyright (C) 2013-2015  Kyle Schwarz
 
TITLE FF Prompt
 
IF NOT EXIST bin\ffmpeg.exe (
  CLS
  ECHO bin\ffmpeg.exe could not be found.
  GOTO:error
)
 
CD bin || GOTO:error
PROMPT $P$_$G
SET PATH=%CD%;%PATH%
CLS
ffmpeg -version
ECHO.
ECHO For help run: ffmpeg -h
ECHO For formats run: ffmpeg -formats ^| more
ECHO For codecs run: ffmpeg -codecs ^| more
ECHO.
ECHO Current directory is now: "%CD%"
ECHO The bin directory has been added to PATH
ECHO.
 
CMD /Q /K 
GOTO:EOF
 
:error
ECHO.
ECHO Press any key to exit.
PAUSE >nul
GOTO:EOF

var startInfo = new ProcessStartInfo {
				FileName = @"ff-prompt.bat",
				RedirectStandardInput = true,
				UseShellExecute = false,
				CreateNoWindow = false
			};
var proc = new Process { StartInfo = startInfo };
proc.Start ();
proc.StandardInput.WriteLine (@"ffmpeg blablabalablabal");
//proc.StandardInput.WriteLine ("exit");
proc.WaitForExit ();

Process p = new Process();
 
p.StartInfo.FileName = "...\\FFMPEG.exe";
p.StartInfo.Arguments = "-i \"Wildlife.wmv\" -qscale 4 -vcodec mjpeg -acodec pcm_s16le \"salida.avi\"";
 
p.Start();
p.WaitForExit();

FileName = @"C:\path\to\ff-prompt.bat"

IF NOT EXIST C:\path\to\bin\ffmpeg.exe

CD C:\path\to\bin