Unable to use on Windows because of dependency on grep about scaper HOT 4 CLOSED

It's a sox problem. I changed on line 96 of sox/core.py:
VALID_FORMATS = _get_valid_formats()
to
VALID_FORMATS = ["wav"]
And now I can use Scaper again (with .wav files).

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@mthaak thanks for posting the issue and for figuring out what the problem is. Have you posted the issue on the pysox repo?

A more general solution would be to check for the OS and use the appropriate command:

import platform

def _get_valid_formats():
    ''' Calls SoX help for a lists of audio formats available with the current
    install of SoX.
    Returns:
    --------
    formats : list
        List of audio file extensions that SoX can process.
    '''
    if NO_SOX:
        return []

    pfm = platform.system()
    if pfm == 'Windows':
        shell_output = subprocess.check_output(
            'sox -h | findstr "AUDIO FILE FORMATS"',
            shell=True)
    else:
        shell_output = subprocess.check_output(
            'sox -h | grep "AUDIO FILE FORMATS"',
            shell=True)

    formats = str(shell_output).strip('\n').split(' ')[3:]
    return formats


VALID_FORMATS = _get_valid_formats()

I don't have access to a windows machine right now so I can't verify that this actually works - @mthaak any chance you can give this a spin? I'm sure @rabitt would be happy to receive a PR :)

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@justinsalamon I have just created an issue on the pysox repo (rabitt/pysox#66) with a solution based on yours.

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@mthaak great, let's continue the discussion over there.

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