Здравствуйте, проблема с телеграм ботом для конвертации видео с ютуба в mp3. пишу на пайтоне. Использую ffmpeg

from __future__ import unicode_literals
import os
import re
import logging
from unicodedata import normalize
import requests
import youtube_dl
from bs4 import BeautifulSoup
from telegram.ext import Updater, CommandHandler, MessageHandler, 
Filters, CallbackContext
#from html.parser import HTMLParser
#from selenium import webdriver


logging.basicConfig(filename='sample.log', 
    format = '%(asctime)s - %(name)s - %(levelname)s - %(message)s',
    level = logging.INFO)

def normalize_special_char(txt):
    return normalize('NFKD', txt).encode('ASCII', 
'ignore').decode('ASCII')

def search_youtube(text):
    url = 'https://www.youtube.com'
    r = requests.get(url + '/results', params={'search_query': text})
    soap = BeautifulSoup(r.content, 'html.parser')
    for tag in soap.find_all('a', {'rel': 'spf-prefetch'}):
        title, video_url = tag.text, url + tag['href']
        if 'googleads' not in video_url:
            return normalize_special_char(title), video_url

def download(title, video_url):
    ydl_opts = {
            'outtmpl': '{}.%(ext)s'.format(title),
            'format': 'bestaudio/best',
            'postprocessors': [{
                'key': 'FFmpegExtractAudio',
                'preferredcodec': 'mp3',
                'preferredquality': '192',
                }],
            }
    with youtube_dl.YoutubeDL(ydl_opts) as ydl:
        ydl.download([video_url])
    return {
        'audio': open(title + '.mp3', 'rb'),
        'title': title,
    }

def start(update, context):
    update.message.reply_text('YouTube Music Downloader')

def  music(bpt, update, context):
     title, video_url = search_youtube(update.message.text)
     update.message.reply_text('Start download ' + title)
     music_dict = download(title, video_url)
     update.message.reply_text('Convert to mp3 ' + title)
     update.message.reply_audio(**music_dict, timeout=9999)
     os.remove(title + '.mp3')

def main():
    u = Updater('my api')
    dp = u.dispatcher
    dp.add_handler(CommandHandler('start', start))
    dp.add_handler(MessageHandler(Filters.text, music))
    u.start_polling()
    u.idle()

if __name__ == '__main__':
    main()