[Bug]: Crash when start live recording

[emericv]

Prerequisites

• I have searched existing issues and discussions to ensure this bug hasn't been reported before
• I have read the troubleshooting section in the README
• I have tested this issue with yt-dlp directly (not just through MeTube UI) as described in the README
• I have checked that this is not a yt-dlp issue (if it is, please report it to yt-dlp repository instead)

Bug Description

metube  | INFO:main:Listening on 0.0.0.0:8081
metube  | INFO:ytdl:Initializing DownloadQueue
metube  | INFO:main:Client connected: YyJDs1lpLQhxxHElAAAB
metube  | INFO:main:Received request to add download
metube  | INFO:main:Request data: {'url': 'https://www.youtube.com/watch?v=xxxxxxxx', 'quality': 'best', 'format': 'any', 'playlist_strict_mode': False, 'auto_start': True}
metube  | INFO:ytdl:adding https://www.youtube.com/watch?v=xxxxxxxxx: quality='best' format='any' already=None folder=None custom_name_prefix='' playlist_strict_mode=False playlist_item_limit=0 auto_start=True
metube  | WARNING: Writing cache to '/dev/null/.cache/yt-dlp/youtube-sts/c6d7bdc9-main.json' failed: Traceback (most recent call last):
metube  |   File "/usr/local/lib/python3.13/site-packages/yt_dlp/cache.py", line 41, in store
metube  |     os.makedirs(os.path.dirname(fn), exist_ok=True)
metube  |     ~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
metube  |   File "<frozen os>", line 218, in makedirs
metube  |   File "<frozen os>", line 218, in makedirs
metube  |   File "<frozen os>", line 228, in makedirs
metube  | NotADirectoryError: [Errno 20] Not a directory: '/dev/null/.cache'
metube  | 
metube  | ERROR:aiohttp.server:Error handling request from 192.168.250.4
metube  | Traceback (most recent call last):
metube  |   File "/usr/local/lib/python3.13/site-packages/aiohttp/web_protocol.py", line 510, in _handle_request
metube  |     resp = await request_handler(request)
metube  |            ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
metube  |   File "/usr/local/lib/python3.13/site-packages/aiohttp/web_app.py", line 569, in _handle
metube  |     return await handler(request)
metube  |            ^^^^^^^^^^^^^^^^^^^^^^
metube  |   File "/app/app/main.py", line 238, in add
metube  |     status = await dqueue.add(url, quality, format, folder, custom_name_prefix, playlist_strict_mode, playlist_item_limit, auto_start)
metube  |              ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
metube  |   File "/app/app/ytdl.py", line 416, in add
metube  |     return await self.__add_entry(entry, quality, format, folder, custom_name_prefix, playlist_strict_mode, playlist_item_limit, auto_start, already)
metube  |            ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
metube  |   File "/app/app/ytdl.py", line 400, in __add_entry
metube  |     await self.__add_download(dl, auto_start)
metube  |   File "/app/app/ytdl.py", line 352, in __add_download
metube  |     self.queue.put(download)
metube  |     ~~~~~~~~~~~~~~^^^^^^^^^^
metube  |   File "/app/app/ytdl.py", line 211, in put
metube  |     shelf[key] = value.info
metube  |     ~~~~~^^^^^
metube  |   File "/usr/local/lib/python3.13/shelve.py", line 124, in __setitem__
metube  |     p.dump(value)
metube  |     ~~~~~~^^^^^^^
metube  | TypeError: cannot pickle '_thread.lock' object

yt-dlp Direct Test Results

With direct yt-dlp, no problem.

Environment & Configuration

Using Docker latest image

Additional Context

No response