[Tutor] os.system vs subprocess.Popen args problems

[learner404]

Hello,

I can't understand why the command below works with os.system but not with
 subprocess.Popen (on windows, recording video with FFMPEG.exe)

cmd=('ffmpeg -f dshow -i video="%s" -f dshow -i audio="%s" -q 5
"%s"')%(videoinputName, audioinputName, videoFileOutput)
os.system(cmd)
*works*

subprocess.Popen(["ffmpeg","-f","dshow","-i",'video="%s"'%videoinputName,"-f","dshow","-i",'audio="%s"'%audioinputName,"-q","5","%s"%videoFileOutput])
*don't work*
>> [dshow @ 025984a0] Could not find video device.
>> video="QuickCam Orbit/Sphere AF": Input/output error

The reason I'm going with subprocess is to avoid to have the DOS window
coming in the forefront.
Any idea of what I'm doing wrong? Or any other way to hide or minimize the
DOS window?

Thanks.
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