def get_ffmpeg(location):
    tar_file = client.file(location).getFile().name
    retcode = subprocess.call(['tar', '-xvf', tar_file, '-C', '/tmp'])
    if retcode == 0:
        ffmpeg_file = '/tmp/ffmpeg-static/ffmpeg'
        os.environ["PATH"] += os.pathsep + ffmpeg_file
        # for testing
        subprocess.call(['ffmpeg'])
    else:
        raise AlgorithmError('tar exited with code %d' % retcode)