I am tryign to use Pentaho to generate a file path and params and then pass this to an exe to run, the issue I have is that it calls the shell script but retains the "" marks around the params

2011/06/16 15:50:43 - ffmpeg.exe - Executing command : cmd.exe /C "D:\ETL\Mobile\ffmpeg-git-39dbe9b-win32-static\bin\ffmpeg.exe " -i D:\ETL\Mobile\ffmpeg-git-39dbe9b-win32-static\bin\9351275.flv -mbd rd -flags +mv4+aic -trellis 2 -cmp 2 -subcmp 2 -g 300 -pass 1 -f mp4 D:\ETL\Mobile\ffmpeg-git-39dbe9b-win32-static\bin\9351275.mp4""

if I copy the shell command to a command prompt it still errors unless I manually remove the quotes around the params.
Is there any way I can fix this in the Step or in the setup of the job?