Repository: youtube-dl
Issue: [Youtube] English auto-sub feature seems to be broken
Labels: broken-IE,duplicate

## Checklist

- [ ] I'm reporting a broken site support issue
- [x] I've verified that I'm running youtube-dl version **2021.12.17**
- [x] I've checked that all provided URLs are alive and playable in a browser
- [x] I've checked that all URLs and arguments with special characters are properly quoted or escaped
- [x] I've searched the bugtracker for similar bug reports including closed ones
- [x] I've read bugs section in FAQ


## Verbose log

```
% youtube-dl -v -f 'bestvideo[ext=mp4]+bestaudio[ext=m4a]/mp4' --convert-subs srt --write-auto-sub --sub-lang en 'https://www.youtube.com/watch?v=wHWWCHAQg9E'
[debug] System config: []
[debug] User config: []
[debug] Custom config: []
[debug] Command-line args: ['-v', '-f', 'bestvideo[ext=mp4]+bestaudio[ext=m4a]/mp4', '--convert-subs', 'srt', '--write-auto-sub', '--sub-lang', 'en', 'https://www.youtube.com/watch?v=wHWWCHAQg9E']
[debug] Encodings: locale UTF-8, fs utf-8, out utf-8, pref UTF-8
[debug] youtube-dl version 2021.12.17
[debug] Python version 3.9.2 (CPython) - Linux-5.15.0-0.bpo.3-amd64-x86_64-with-glibc2.31
[debug] exe versions: ffmpeg 4.3.3-0, ffprobe 4.3.3-0, phantomjs 2.1.1, rtmpdump 2.4
[debug] Proxy map: {}
[youtube] wHWWCHAQg9E: Downloading webpage
[info] Writing video subtitles to: Mariner 9 Orbits Mars-wHWWCHAQg9E.en.vtt
[debug] Invoking downloader on 'https://rr1---sn-25ge7nsd.googlevideo.com/videoplayback?expire=1646583371&ei=64kkYsb0I-bBxgLDgITgBA&ip=2a01%3Ae0a%3A343%3A1a00%3A4239%3A8c08%3A9c52%3A2803&id=o-ANSuqxc1vJRKBzoXfXYvMAdCfJD6RQc70UDacfRyM81i&itag=134&aitags=133%2C134%2C160%2C242%2C243%2C278&source=youtube&requiressl=yes&mh=ow&mm=31%2C29&mn=sn-25ge7nsd%2Csn-25glene6&ms=au%2Crdu&mv=m&mvi=1&pl=52&initcwndbps=1097500&vprv=1&mime=video%2Fmp4&ns=QMcp_TKJ0R5Ol_yWPw9qegkG&gir=yes&clen=1554583&dur=81.281&lmt=1552962991497935&mt=1646561569&fvip=1&keepalive=yes&fexp=24001373%2C24007246&c=WEB&txp=1311222&n=QfYR29pf_LsQ4WzY0&sparams=expire%2Cei%2Cip%2Cid%2Caitags%2Csource%2Crequiressl%2Cvprv%2Cmime%2Cns%2Cgir%2Cclen%2Cdur%2Clmt&sig=AOq0QJ8wRQIhAN0Z-2dfod-S_qOpUKyjuMqyObwGkvYo7OCZctMnYrtsAiB_RjlZ6j35E5abgaR90Q5S_4rmWN9zJYleta4Z8Ge2Fg%3D%3D&lsparams=mh%2Cmm%2Cmn%2Cms%2Cmv%2Cmvi%2Cpl%2Cinitcwndbps&lsig=AG3C_xAwRAIgbuKcXph7rRssii9a_Ax03iQMzS57YzvNDJl343MU4SICIA4xWYYbx-nQYfTYR7_T7J9Wnjf_Fb4y8uN587EHNdyQ'
[download] Destination: Mariner 9 Orbits Mars-wHWWCHAQg9E.f134.mp4
[download] 100% of 1.48MiB in 00:35
[debug] Invoking downloader on 'https://rr1---sn-25ge7nsd.googlevideo.com/videoplayback?expire=1646583371&ei=64kkYsb0I-bBxgLDgITgBA&ip=2a01%3Ae0a%3A343%3A1a00%3A4239%3A8c08%3A9c52%3A2803&id=o-ANSuqxc1vJRKBzoXfXYvMAdCfJD6RQc70UDacfRyM81i&itag=140&source=youtube&requiressl=yes&mh=ow&mm=31%2C29&mn=sn-25ge7nsd%2Csn-25glene6&ms=au%2Crdu&mv=m&mvi=1&pl=52&initcwndbps=1097500&vprv=1&mime=audio%2Fmp4&ns=QMcp_TKJ0R5Ol_yWPw9qegkG&gir=yes&clen=1317369&dur=81.339&lmt=1552962901961935&mt=1646561569&fvip=1&keepalive=yes&fexp=24001373%2C24007246&c=WEB&txp=1311222&n=QfYR29pf_LsQ4WzY0&sparams=expire%2Cei%2Cip%2Cid%2Citag%2Csource%2Crequiressl%2Cvprv%2Cmime%2Cns%2Cgir%2Cclen%2Cdur%2Clmt&sig=AOq0QJ8wRAIgCCCo9AABEceOXp8-JtaMEoNU6hzcTfpsTuWnVX9B2_cCIExEB_xElqAcWbxtamwczrR9OnpicDtkwQPYhzck4RPZ&lsparams=mh%2Cmm%2Cmn%2Cms%2Cmv%2Cmvi%2Cpl%2Cinitcwndbps&lsig=AG3C_xAwRAIgbuKcXph7rRssii9a_Ax03iQMzS57YzvNDJl343MU4SICIA4xWYYbx-nQYfTYR7_T7J9Wnjf_Fb4y8uN587EHNdyQ'
[download] Destination: Mariner 9 Orbits Mars-wHWWCHAQg9E.f140.m4a
[download] 100% of 1.26MiB in 00:29
[ffmpeg] Merging formats into "Mariner 9 Orbits Mars-wHWWCHAQg9E.mp4"
[debug] ffmpeg command line: ffmpeg -y -loglevel repeat+info -i 'file:Mariner 9 Orbits Mars-wHWWCHAQg9E.f134.mp4' -i 'file:Mariner 9 Orbits Mars-wHWWCHAQg9E.f140.m4a' -c copy -map 0:v:0 -map 1:a:0 'file:Mariner 9 Orbits Mars-wHWWCHAQg9E.temp.mp4'
Deleting original file Mariner 9 Orbits Mars-wHWWCHAQg9E.f134.mp4 (pass -k to keep)
Deleting original file Mariner 9 Orbits Mars-wHWWCHAQg9E.f140.m4a (pass -k to keep)
[ffmpeg] Converting subtitles
[debug] ffmpeg command line: ffmpeg -y -loglevel repeat+info -i 'file:Mariner 9 Orbits Mars-wHWWCHAQg9E.en.vtt' -f srt 'file:Mariner 9 Orbits Mars-wHWWCHAQg9E.en.srt'
Deleting original file Mariner 9 Orbits Mars-wHWWCHAQg9E.en.vtt (pass -k to keep)
```


## Description


If you displayed the movie generated

```
% mpv "Mariner 9 Orbits Mars-wHWWCHAQg9E.mp4"  
```

you'll notice that the complete subs are displayed on the first frame.

Now try the above command again using `fr` (for example) and display it. You'll notice the subs are displayed in sync with the video:

```
% youtube-dl -v -f 'bestvideo[ext=mp4]+bestaudio[ext=m4a]/mp4' --convert-subs srt --write-auto-sub --sub-lang fr 'https://www.youtube.com/watch?v=wHWWCHAQg9E'
```