def createAudio(cont, pid, conn):

    contlen = len(cont.decode('utf-8'))  # 获取汉字长度

    startindex = 0

    i = 0

    inputs = OrderedDict() # 创建有序的文件字典

    outfile = ''

    while contlen > startindex:

        s = startindex + 300

        endindex = min(s, contlen)

        srctext = cont.decode('utf-8')[startindex:endindex].encode('utf-8') # 截取中文长度

        outfile = getResponse(i, srctext)

        if outfile != '':

            inputs.update({outfile: None}) # 向有序字典中加入item

        startindex = s

        if startindex >= contlen:

            break

        i = i + 1

    if i > 0:

        param = '-filter_complex \''

        for j in range(i+1):

            param += '[' + str(j) + ':0]'

        param += ' concat=n='+ str(i+1) + ':v=0:a=1 [a]\' -map [a]'

        m2 = hashlib.md5()

        m2.update(cont)

        outfile = 'audio/%s.mp3' % m2.hexdigest() # 合并后文件名

        outputs={outfile: param}

        ff = FFmpeg(executable="/usr/local/ffmpeg/bin/ffmpeg",

                inputs=inputs, outputs=outputs)

        #ff.cmd # 查看ffmpeg命令

        ff.run()

ffmpeg -i a.mp3 -i b.mp3 -filter_complex '[0:0] [1:0] concat=n=2:v=0:a=1 [a]' -map [a] out.mp3