WMA to MP3 Conversion for Mac OS X

convert.py

#!/usr/bin/python
import os
import re
import subprocess
import sys


# script configuration
if sys.platform == "darwin":
    MPLAYER_PATH = os.path.join(
        "/Applications/Non-Standard/Audio and Video",
        "MPlayer OS X 2.app/Contents/Resources/mplayer.app/Contents/MacOS")
    # lame was manually installed into /usr/bin
    LAME_PATH="/usr/bin"
elif sys.platform == "linux2":
    MPLAYER_PATH = "/usr/bin"
    LAME_PATH="/usr/bin"
MPLAYER = os.path.join(MPLAYER_PATH, "mplayer")
LAME = os.path.join(LAME_PATH, "lame")
DUMP_FILE = "audiodump.wav"
BACKUP_DIR = "wma"
WORKING_DIR = "/tmp"


def make_audio_dump(filename):
    """
    Use mplayer to dump the audio contents of the .wma files as .wav files.
    """
    command = ("\"%s\" -nosound -vo null -vc dummy -af resample=44100 -aid 1 " 
               "-ao pcm:waveheader \"%s\"" % (MPLAYER, filename))
    subprocess.call(command, shell=True)


def convert_wav_to_mp3(input, output):
    """
    Use lame to convert the .wav files to .mp3 files. Remove the raw .wav file
    when done.
    """
    command = "\"%s\" -b 256 -h \"%s\" -o \"%s\"" % (LAME, input, output)
    subprocess.call(command, shell=True)
    os.unlink(input)


def convert_wma_to_mp3(wma_filename):
    """
    Given a .wma filename, get a filename for the new .mp3 file based on this,
    convert the original to a .wav and then that to an .mp3 file.
    """
    mp3_filename = re.sub("\.wma$", ".mp3", wma_filename)
    make_audio_dump(wma_filename)
    convert_wav_to_mp3(DUMP_FILE, mp3_filename)


def has_wma_files(filenames):
    """
    Given a list of filenames, check to see if any of them have the .wma file
    extension. If so, return a true value; otherwise, a false one.
    """
    for filename in filenames:
        if filename.endswith(".wma"):
            return True
    return False


def convert_wma_files(path):
    """
    Walk a given file system directory and all its child directories in order
    to find .wma files. If found, convert them to .mp3 files and backup the
    originals.
    """
    for dir, subdirs, filenames in os.walk(path):
        # we don't want to convert files that have already been converted
        if os.path.basename(dir) == BACKUP_DIR:
            continue
        # if there's nothing to do, move on
        if not has_wma_files(filenames):
            continue
        # define and create the backup dir, if it hasn't been already
        backup_dir = os.path.join(dir, BACKUP_DIR)
        if not os.path.exists(backup_dir):
            os.mkdir(backup_dir)
        for filename in sorted(filenames):
            # on mac os x samba shares, sometimes ._*.wma files are present;
            # skip these
            if filename.startswith("."):
                continue
            if filename.endswith(".wma"):
                print "Dumping audio for %s ..." % (filename)
                wma_filename = os.path.join(dir,  filename)
                wma_backup = os.path.join(backup_dir, filename)
                convert_wma_to_mp3(wma_filename)
                os.rename(wma_filename, wma_backup)


if __name__ == "__main__":
    path = sys.argv[1]
    os.chdir(WORKING_DIR)
    convert_wma_files(path)

There are lots of WMA to MP3 Converter on the market and most of them are compatible with Mac OS X.

I used to use one of them to convert WMA to MP3, WAV, AAC, M4A, etc. Its name is Faasoft WMA to MP3 Converter. Here is the guide to inform you how to use this program to convert WMA to MP3 at: http://www.faasoft.com/articles/wma-to-mp3-mac-and-windows.html

Hope it can help you too.

I use Avdshare Audio Converter to convert WMA to MP3 on my mac computer.
In fact, it also has windows version. It also helps to convert wma to other audio format like flac, m4a, mp3, ogg, aac, wav etc.
It even can convert audio to wma format.
It also helps to extract audio from video files.
Here is the step by step guide https://www.avdshare.com/wma-converter-for-mac-and-windows