Why can't python find my file?

Question

So someone wrote a joke trapifier script (as in, 'Trap music') and I can't get it to work.

usage: trapifier.py [-h] [--samples [SAMPLES]] inputfile outputfile

Yet, despite the folder looking like this

ls -l
total 14288
-rwxrwxrwx   1 ________  ________  7295612 Mar  2  2008 Chicago.mp3
-rwxr-xr-x@  1 ________  ________     1074 Apr 12 17:00 LICENSE
-rwxr-xr-x@  1 ________  ________     2871 Apr 12 17:00 README.md
-rwxr-xr-x@  1 ________  ________        6 Apr 12 17:00 requirements.txt
drwxr-xr-x@ 48 ________  ________     1632 Apr 12 17:00 samples
-rwxr-xr-x   1 ________  ________     2923 Apr 12 17:00 trapifier.py

This command always results in a [Errno 2] No such file or directory

./trapifier.py Chicago.mp3 Chiraq.mp3

or

python trapifier.py Chicago.mp3 Chiraq.mp3

or even

./trapifier.py /full/path/to/Chicago.mp3 Chiraq.mp3

What gives? I feel like there is a rookie mistake somewhere.

The full error message by request:

    Traceback (most recent call last):
  File "./trapifier.py", line 89, in <module>
    overlay(parse())
  File "./trapifier.py", line 32, in parse
    base_track = pydub.AudioSegment.from_mp3(inputfile)
  File "/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site-packages/pydub/audio_segment.py", line 297, in from_mp3
    return cls.from_file(file, 'mp3')
  File "/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site-packages/pydub/audio_segment.py", line 284, in from_file
    subprocess.call(convertion_command, stderr=open(os.devnull))
  File "/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/subprocess.py", line 493, in call
    return Popen(*popenargs, **kwargs).wait()
  File "/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/subprocess.py", line 679, in     __init__
    errread, errwrite)
  File "/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/subprocess.py", line 1249,     in _execute_child
    raise child_exception
OSError: [Errno 2] No such file or directory

Source of the script is hosted at https://github.com/japesinator/trapifier.py

I have all the required libraries (argparse, pydub, os, random).

First Useful Edit: It appears that pydub.AudioSegment failing to load is the culprit. However, things get stranger. In a python terminal I can do

from pydub import AudioSegment

but I get a no such module error when I do

import pydub.AudioSegment

Answer 1

It's pretty common that pydub cannot find ffmpeg which is used to decode and encode mp3 files (and all other non-wave formats). If you have ffmpeg installed and it is still not working you can explicitly tell pydub where to find it like so:

from pydub import AudioSegment
AudioSegment.ffmpeg = "/path/to/ffmpeg"

You may also find our getting ffmpeg set up docs helpful =D

edit – Last resort option: If you can't get get pydub to find ffmpeg despite your best efforts you could convert everything to wave format before passing the files to pydub. This is a last resort for sure, but it would circumvent the ffmpeg issue since pydub supports wave natively.