discord.py使机器人在用户开始流媒体时发送消息

import discord
from discord.ext import commands

intents = discord.Intents.default()
intents.typing = False
intents.presences = False

bot = commands.Bot(command_prefix='!', intents=intents)

@bot.event
async def on_ready():
    print(f'Bot is ready. Logged in as {bot.user.name}')

@bot.event
async def on_voice_state_update(member, before, after):
    if before.channel is None and after.channel is not None:
        if after.channel.type == discord.ChannelType.voice:
            await member.send("您开始进行了流媒体！")

bot.run('YOUR_BOT_TOKEN')