too many open files error, makes metube selfterminate

[andbir]

If you download a very long playlist, in my case the DUST sci-fi archives meTube v1.240620 running on QNAP x64 will eventually choke on itself, thus not be able to handle its' own database calls and exit:

n = pdAdSu3kY1sHV-U8 ; player = https://www.youtube.com/s/player/d2e656ee/player_ias.vflset/en_US/base.js
WARNING: [youtube] CeloPsVCZ3A: nsig extraction failed: You may experience throttling for some formats
n = hQ7WQeIieuhkyUsa ; player = https://www.youtube.com/s/player/d2e656ee/player_ias.vflset/en_US/base.js
WARNING: [youtube] Failed to download m3u8 information: <urllib3.connection.HTTPSConnection object at 0x7fc3c67a4ed0>: Failed to establish a new connection: [Errno 24] Too many open files
ERROR:asyncio:Task exception was never retrieved
future: <Task finished name='Task-3' coro=<DownloadQueue.__import_queue() done, defined at /share/CACHEDEV3_DATA/.qpkg/meTube83/metube/app/ytdl.py:213> exception=error("db file doesn't exist; use 'c' or 'n' flag to create a new db")>
Traceback (most recent call last):
File "/share/CACHEDEV3_DATA/.qpkg/meTube83/metube/app/ytdl.py", line 215, in __import_queue
File "/share/CACHEDEV3_DATA/.qpkg/meTube83/metube/app/ytdl.py", line 317, in add
File "/share/CACHEDEV3_DATA/.qpkg/meTube83/metube/app/ytdl.py", line 295, in __add_entry
File "/share/CACHEDEV3_DATA/.qpkg/meTube83/metube/app/ytdl.py", line 189, in put
File "/opt/Apache83/lib/python3.11/shelve.py", line 243, in open
File "/opt/Apache83/lib/python3.11/shelve.py", line 227, in init
File "/opt/Apache83/lib/python3.11/dbm/init.py", line 85, in open
dbm.error: db file doesn't exist; use 'c' or 'n' flag to create a new db
INFO:ytdl:downloading Sci-Fi Short Film “Sleepworking” | DUST
ERROR:asyncio:Task exception was never retrieved
future: <Task finished name='Task-2' coro=<DownloadQueue.__download() done, defined at /share/CACHEDEV3_DATA/.qpkg/meTube83/metube/app/ytdl.py:366> exception=OSError(24, 'Too many open files')>
Traceback (most recent call last):
File "/share/CACHEDEV3_DATA/.qpkg/meTube83/metube/app/ytdl.py", line 374, in __download
File "/share/CACHEDEV3_DATA/.qpkg/meTube83/metube/app/ytdl.py", line 108, in start
File "/opt/Apache83/lib/python3.11/multiprocessing/process.py", line 121, in start
File "/opt/Apache83/lib/python3.11/multiprocessing/context.py", line 224, in _Popen
File "/opt/Apache83/lib/python3.11/multiprocessing/context.py", line 281, in _Popen
File "/opt/Apache83/lib/python3.11/multiprocessing/popen_fork.py", line 19, in init
File "/opt/Apache83/lib/python3.11/multiprocessing/popen_fork.py", line 65, in _launch
OSError: [Errno 24] Too many open files

[PikuZheng]

A known Linux kernel bug causes this error in Linux kernel 4.19-5.9, maybe it's the reason of your issue?