Youtube writing subs silent error

[axsesolga]

Checklist

• I'm reporting a broken site support
• I've verified that I'm running youtube-dl version 2020.03.24
• I've checked that all provided URLs are alive and playable in a browser
• I've checked that all URLs and arguments with special characters are properly quoted or escaped
• I've searched the bugtracker for similar issues including closed ones

Verbose log

[youtube] DhKQOGx7R0s: Downloading webpage
[youtube] DhKQOGx7R0s: Downloading video info webpage
[youtube] DhKQOGx7R0s: Looking for automatic captions
[info] Writing video subtitles to: test-DhKQOGx7R0s.ru.vtt

Description

The code worked well for dates Mar 15 02:29 to Mar 21 13:53 and then it wasn't running for several days. Now if I try to run same code the app stops at [info] Writing video subtitles to: line or auto subs not found line. I tried several youtube videos, always with same result. Also the big problem that there is no error message, so I can't understand where problem is. I tryed several proxies, re-create temp empty .vtt file, change language (turkish, russian, french). Before updating, on previous version, I had same error