Python using windows command line [duplicate]

Question

I have this python code:

        import os
        os.system('cd C:\yt')
        os.system("ffmpeg.exe -i test.mp4 newfilename.mp3")

The yt folder include the ffmeg.exe and test.mp4 but I write the code apart on cmd everthing is working but thus I get this error message:

       'ffmpeg.exe' is not recognized as an internal or external command,
       operable program or batch file.

if I use C:\yt\ffmpeg.exe -i test.mp4 newfilename.mp3 is not working and if i use only os.system('cd C:\yt') i not get error message. What's wrong with my code?

os.system executes commands in a subshell, which means that the second command is not executed in C:\yt — Patrick Haugh
– Patrick Haugh, Commented Oct 1, 2017 at 14:02
I reoommend: subprocess.call("ffmpeg.exe -i test.mp4 newfilename.mp3",cwd=r"c:\yt") — Jean-François Fabre
– Jean-François Fabre ♦, Commented Oct 1, 2017 at 14:05

Adders · Accepted Answer · 2017-10-01 14:02:59Z

0

You need to move to that directory. Try the following:

import os
os.chdir('C:\yt')
print os.getcwd() # confirm location
os.system("ffmpeg.exe -i test.mp4 newfilename.mp3")

answered Oct 1, 2017 at 14:02

Adders

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3 Comments

Jean-François Fabre Over a year ago

it's really a bad way of running a command in a separate directory.

Adders Over a year ago

I'm following the OPs approach

Jean-François Fabre Over a year ago

I know, but sometimes it's better not to, or explain then provide a better approach.

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