--write-auto-sub contains time marks in subtitles

[weisenhan]

~/watch$ youtube-dl --skip-download --write-auto-sub --verbose https://www.youtube.com/watch?v=hGxxahRvSw0
[debug] System config: []
[debug] User config: []
[debug] Custom config: []
[debug] Command-line args: [u'--skip-download', u'--write-auto-sub', u'--verbose', u'https://www.youtube.com/watch?v=hGxxahRvSw0']
[debug] Encodings: locale UTF-8, fs UTF-8, out UTF-8, pref UTF-8
[debug] youtube-dl version 2020.01.24
[debug] Python version 2.7.17 (CPython) - Linux-4.15.0-76-generic-x86_64-with-LinuxMint-19.3-tricia
[debug] exe versions: ffmpeg 3.4.6, ffprobe 3.4.6, phantomjs 2.1.1
[debug] Proxy map: {}
[youtube] hGxxahRvSw0: Downloading webpage
[youtube] hGxxahRvSw0: Downloading video info webpage
[youtube] hGxxahRvSw0: Looking for automatic captions
[debug] Default format spec: bestvideo+bestaudio/best
[info] Writing video subtitles to: Rage Against the Bank Machine - A Dose of Buckley-hGxxahRvSw0.en.vtt

Checklist

• I'm reporting a broken site support issue
• I've verified that I'm running youtube-dl version 2020.01.24
• 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 bug reports including closed ones
• I've read bugs section in FAQ

Verbose log

~/watch$ youtube-dl --skip-download --write-auto-sub --verbose https://www.youtube.com/watch?v=hGxxahRvSw0
[debug] System config: []
[debug] User config: []
[debug] Custom config: []
[debug] Command-line args: [u'--skip-download', u'--write-auto-sub', u'--verbose', u'https://www.youtube.com/watch?v=hGxxahRvSw0']
[debug] Encodings: locale UTF-8, fs UTF-8, out UTF-8, pref UTF-8
[debug] youtube-dl version 2020.01.24
[debug] Python version 2.7.17 (CPython) - Linux-4.15.0-76-generic-x86_64-with-LinuxMint-19.3-tricia
[debug] exe versions: ffmpeg 3.4.6, ffprobe 3.4.6, phantomjs 2.1.1
[debug] Proxy map: {}
[youtube] hGxxahRvSw0: Downloading webpage
[youtube] hGxxahRvSw0: Downloading video info webpage
[youtube] hGxxahRvSw0: Looking for automatic captions
[debug] Default format spec: bestvideo+bestaudio/best
[info] Writing video subtitles to: Rage Against the Bank Machine - A Dose of Buckley-hGxxahRvSw0.en.vtt

Description

The subtitles display time codes as seen:

subtitle file:
WEBVTT
Kind: captions
Language: en

00:00:00.030 --> 00:00:02.750 align:start position:0%

not<00:00:00.870> enough<00:00:01.140> Buckley<00:00:01.589> in<00:00:01.680> your<00:00:01.800> life<00:00:01.979> get

00:00:02.750 --> 00:00:02.760 align:start position:0%
not enough Buckley in your life get

00:00:02.760 --> 00:00:04.670 align:start position:0%
not enough Buckley in your life get
access<00:00:03.179> to<00:00:03.210> exclusive<00:00:03.540> content<00:00:04.049> you<00:00:04.470> won't

00:00:04.670 --> 00:00:04.680 align:start position:0%
access to exclusive content you won't

00:00:04.680 --> 00:00:06.829 align:start position:0%
access to exclusive content you won't
see<00:00:04.920> on<00:00:04.950> YouTube<00:00:05.490> when<00:00:05.970> you<00:00:06.089> support<00:00:06.420> me<00:00:06.600> at

00:00:06.829 --> 00:00:06.839 align:start position:0%
see on YouTube when you support me at

[orena1]

The automatic subtitles suppose to have time-marks, the manual subtitles usually do not have