mpv+yt-dlp= youtube stopped working today (both latest releases [nightly])

[geextahslex]

mpv Information

mpv v0.39.0-615-gca211b5b Copyright © 2000-2025 mpv/MPlayer/mplayer2 projects
 built on Jan 11 2025 00:10:20
libplacebo version: v7.350.0 (v7.349.0-30-g056b852-dirty)
FFmpeg version: N-118300-g5a72266d4
FFmpeg library versions:
   libavcodec      61.31.100
   libavdevice     61.4.100
   libavfilter     10.6.101
   libavformat     61.9.106
   libavutil       59.55.100
   libswresample   5.4.100
   libswscale      8.13.100

Other Information

Windows version: Windows 10 22H2 Build 19045.4170)
GPU model, driver and version: intel HD Graphics 4600, driver: 20.19.15.5171
Source of mpv: https://sourceforge.net/projects/mpv-player-windows/files/
Introduced in version: present since v38.0
Issue started after the following happened: it just stopped working today

Reproduction Steps

try to play youtube with mpv+yt-dlp
example
mpv https://www.youtube.com/watch?v=zcvvUce6O0Q

Expected Behavior

youtube starts as usual

Actual Behavior

nothing happens, the process hangs in task manager mpv.exe and yt-dlp.exe
no youtube playback

Log File

output.txt

Sample Files

task manager screenshot

No response

I carefully read all instruction and confirm that I did the following:

• I tested with the latest mpv version to validate that the issue is not already fixed.
• I provided all required information including system and mpv version.
• I produced the log file with the exact same set of files, parameters, and conditions used in "Reproduction Steps", with the addition of --log-file=output.txt.
• I produced the log file while the behaviors described in "Actual Behavior" were actively observed.
• I attached the full, untruncated log file.
• I attached the backtrace in the case of a crash.

[llyyr]

[ 0.024][v][ytdl_hook] Starting subprocess: [yt-dlp, --no-warnings, -J, --flat-playlist, --sub-format, ass/srt/best, --format, bestvideo+bestaudio/best, --sub-langs, all, --write-srt, --no-playlist, --, https://www.youtube.com/watch?v=xmJUZgQ5HpQ]

mpv starts yt-dlp subprocess but it doesn't progress. nothing to do from mpv's end. run yt-dlp by itself to see what it says.

[geextahslex]

Thanks for your answer. Not much happens there, it just hangs with this cmd

Downloading audio from: https://www.youtube.com/watch?v=e_FGmo0emiM
[youtube] Extracting URL: https://www.youtube.com/watch?v=e_FGmo0emiM
[youtube] e_FGmo0emiM: Downloading webpage
WARNING: [youtube] Unable to download webpage: <urllib3.connection.HTTPSConnection object at 0x00000284C422F460>: Failed to resolve 'www.youtube.com' ([Errno 11001] getaddrinfo failed)
[youtube] e_FGmo0emiM: Downloading ios player API JSON
WARNING: [youtube] <urllib3.connection.HTTPSConnection object at 0x00000284C425B8B0>: Failed to resolve 'www.youtube.com' ([Errno 11001] getaddrinfo failed). Retrying (1/3)...
[youtube] e_FGmo0emiM: Downloading ios player API JSON

[llyyr]

Failed to resolve 'www.youtube.com'

Issue with your dns, ISP or you're blocked off youtube. not a mpv or yt-dlp bug.

[Obegg]

yt-dlp/yt-dlp#12085 (comment)

[geextahslex]

this was caused by ipv4/6