Discord Bot调用ffmpeg时遇subprocess.py权限拒绝错误的解决求助

问题描述 #

Discord Bot 在调用 subprocess.py 时抛出 PermissionError: [WinError 5] Access is denied，推测与 ffmpeg 相关。完整报错回溯如下：

Traceback (most recent call last):
  File "C:\Users\myuser\AppData\Local\Packages\PythonSoftwareFoundation.Python.bunch_of_numbers\LocalCache\local-packages\Python310\site-packages\interactions\client\client.py", line 1900, in __dispatch_interaction
    response = await callback
  File "C:\Users\myuser\AppData\Local\Packages\PythonSoftwareFoundation.Python.bunch_of_numbers\LocalCache\local-packages\Python310\site-packages\interactions\client\client.py", line 1771, in _run_slash_command
    return await command(ctx, **ctx.kwargs)
  File "C:\Users\myuser\AppData\Local\Packages\PythonSoftwareFoundation.Python.bunch_of_numbers\LocalCache\local-packages\Python310\site-packages\interactions\models\internal\command.py", line 132, in __call__
    await self.call_callback(self.callback, context)
  File "C:\Users\myuser\AppData\Local\Packages\PythonSoftwareFoundation.Python.bunch_of_numbers\LocalCache\local-packages\Python310\site-packages\interactions\models\internal\application_commands.py", line 802, in call_callback
    return await self.call_with_binding(callback, ctx)
  File "C:\Users\myuser\AppData\Local\Packages\PythonSoftwareFoundation.Python.bunch_of_numbers\LocalCache\local-packages\Python310\site-packages\interactions\models\internal\callback.py", line 43, in call_with_binding
    return await callback(*args, **kwargs)
  File "C:\Users\myuser\OneDrive\Desktop\button.py", line 38, in press
    voice_client.play(discord.FFmpegPCMAudio(executable=r"C:\Users\myuser\OneDrive\Desktop\ffmpeg-6.1-essentials_build\bin", source=audiosource))
  File "C:\Users\myuser\AppData\Local\Packages\PythonSoftwareFoundation.Python.Bunch_of_numbers\LocalCache\local-packages\Python310\site-packages\discord\player.py", line 290, in __init__
    super().__init__(source, executable=executable, args=args, **subprocess_kwargs)
  File "C:\Users\myuser\AppData\Local\Packages\PythonSoftwareFoundation.Python.bunch_of_numbers\LocalCache\local-packages\Python310\site-packages\discord\player.py", line 166, in __init__
    self._process = self._spawn_process(args, **kwargs)
  File "C:\Users\myuser\AppData\Local\Packages\PythonSoftwareFoundation.Python.bunch_of_numbers\LocalCache\local-packages\Python310\site-packages\discord\player.py", line 180, in _spawn_process
    process = subprocess.Popen(args, creationflags=CREATE_NO_WINDOW, **subprocess_kwargs)
  File "C:\Program Files\WindowsApps\PythonSoftwareFoundation.Python.bunch_of_numbers\lib\subprocess.py", line 971, in __init__
    self._execute_child(args, executable, preexec_fn, close_fds,
  File "C:\Program Files\WindowsApps\PythonSoftwareFoundation.Python.bunch_of_numbers\lib\subprocess.py", line 1456, in _execute_child
    hp, ht, pid, tid = _winapi.CreateProcess(executable, args,
PermissionError: [WinError 5] Access is denied

原代码：

import interactions
import discord
from discord import FFmpegPCMAudio
import tracemalloc

ffmpegexec = r"C:\Users\myuser\OneDrive\Desktop\ffmpeg-6.1-essentials_build\bin\ffmpeg.exe"

audiosource = r"C:\Users\myuser\Downloads\seatbelt-online-audio-converter.mp3"

source = discord.FFmpegPCMAudio(audiosource)

token = "my_token"

bot = interactions.Client(token=token)

tracemalloc.start()

@interactions.slash_command(
    name="joinvc",
    description="starts the game"
)

async def joinvc(ctx: interactions.ComponentContext):
    await ctx.send("Joining vc. Please make sure you are currently in a vc!")
    vc = ctx.author.voice.channel
    await vc.connect()

@interactions.slash_command(
    name="press",
    description="Press the button"
)

async def press(ctx: interactions.ComponentContext):
    await ctx.send(f"{ctx.author.mention} has pressed the button")
    vc = ctx.author.voice.channel
    voice_client = await vc.connect()  # Connect to the voice channel

voice_client.play(discord.FFmpegPCMAudio(executable=r"C:\Users\myuser\OneDrive\Desktop\ffmpeg-6.1-essentials_build\bin", source=audiosource))


bot.start(token)

需求：实现 /press 命令触发 Bot 在语音频道播放指定音频。

问题原因与解决步骤 #

1. FFmpeg 路径错误 #

报错核心是给 executable 参数传了 ffmpeg 的文件夹路径，而非 ffmpeg.exe 完整路径。Windows 无法直接执行文件夹，导致权限报错。

• 修正：将 executable 参数替换为已定义的 ffmpegexec 变量（完整的 ffmpeg.exe 路径）。

2. 代码缩进错误 #

voice_client.play() 语句位于 press 函数外部，Bot 启动时会立即执行，此时 voice_client 未定义，必然报错。

• 修正：将该语句缩进，放入 press 函数内部，确保连接语音频道后再调用播放方法。

3. 避免重复连接语音频道 #

若用户已通过 /joinvc 让 Bot 进入频道，/press 中再次调用 await vc.connect() 会触发重复连接错误。

• 优化：先检查 Bot 是否已在目标频道连接，已连接则直接获取现有 voice_client，未连接再执行连接操作。

4. 权限与路径优化 #

• 避免将 ffmpeg 放在 OneDrive 路径下，同步过程可能导致文件访问异常，建议移至本地非同步文件夹（如 C:\ffmpeg\bin\ffmpeg.exe）。
• 确保 Python 和 ffmpeg 以管理员权限运行，规避 Windows 权限限制。

修正后的完整代码 #

import interactions
import discord
from discord import FFmpegPCMAudio
import tracemalloc

# 替换为你的ffmpeg.exe完整路径，建议移到非OneDrive目录
ffmpegexec = r"C:\Users\myuser\OneDrive\Desktop\ffmpeg-6.1-essentials_build\bin\ffmpeg.exe"
audiosource = r"C:\Users\myuser\Downloads\seatbelt-online-audio-converter.mp3"
token = "your_bot_token_here"

bot = interactions.Client(token=token)
tracemalloc.start()

@interactions.slash_command(name="joinvc", description="让Bot加入语音频道")
async def joinvc(ctx: interactions.ComponentContext):
    if not ctx.author.voice:
        await ctx.send("你需要先加入一个语音频道！")
        return
    vc = ctx.author.voice.channel
    # 检查是否已连接
    if ctx.guild.voice_client:
        await ctx.send("Bot已经在语音频道里了！")
        return
    await vc.connect()
    await ctx.send("已加入语音频道！")

@interactions.slash_command(name="press", description="触发播放音频")
async def press(ctx: interactions.ComponentContext):
    if not ctx.author.voice:
        await ctx.send("你需要先加入一个语音频道！")
        return
    
    vc = ctx.author.voice.channel
    voice_client = ctx.guild.voice_client
    
    # 如果未连接则先连接
    if not voice_client or not voice_client.is_connected():
        voice_client = await vc.connect()
    
    # 使用正确的ffmpeg路径播放音频
    audio_player = FFmpegPCMAudio(source=audiosource, executable=ffmpegexec)
    voice_client.play(audio_player)
    await ctx.send(f"{ctx.author.mention} 触发了音频播放！")

bot.start(token)

内容的提问来源于stack exchange，提问作者Kronik71