title: Python / Discord FFMPEG playing not a audio
body: <p>I wanted to play an mp3 file in a voice channel, however, it gives me an error... I have already installed FFMPEG correctly on my computer.</p>
  <p>My Code:</p>
  <pre><code>@bot.command()
  async def joinandplay(ctx):
     song = os.path.isfile(&quot;musik.mp3&quot;)
     voice_channel = bot.get_channel(940326390857883648)
     vc = await voice_channel.connect()
     voice = discord.FFmpegPCMAudio(song)
     vc.play(voice)
  </code></pre>
  <p>The error:</p>
  <pre><code>AttributeError: 'FFmpegPCMAudio' object has no attribute '_process'
  </code></pre>