[youtube] youtube-dl will completely skip subtitles under different names

Checklist

[x] I'm reporting a broken site support
[x] I've verified that I'm running youtube-dl version 2021.06.06
[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 issues including closed ones

Verbose log

> youtube-dl -v --all-subs
[debug] System config: []
[debug] User config: ['--add-metadata', '--write-sub', '--all-subs', '--sub-format', 'ass/vtt/srt/best', '--embed-subs'][debug] Custom config: []
[debug] Command-line args: ['-v', '--all-subs', '--skip-download', 'https://youtu.be/oIa3BFBHJFI']
[debug] Encodings: locale cp1252, fs mbcs, out cp1252, pref cp1252
[debug] youtube-dl version 2021.06.06
[debug] Python version 3.4.4 (CPython) - Windows-10-10.0.19041
[debug] exe versions: ffmpeg N-102631-gbaf5cc5b7a, ffprobe N-102631-gbaf5cc5b7a
[debug] Proxy map: {}
[debug] Default format spec: bestvideo+bestaudio/best

Description

The video

https://youtu.be/oIa3BFBHJFI

The problem

the video above has 205 subtitles. but youtube-dl will only download 127, completely skipping over subtitle tracks like Korean - morse code and English - I am Groot, Korean - elementary schooler and most importantly, English - NES 6052 Assembly.

youtube-dl only sees the snippet.language of the subtitle and ignore the snippet.name part of the subtitle. when "A video can have multiple tracks for the same language [under] a different name." #source

The solution, and my proposal.

youtube-dl should respect the different named multiple subtitle tracks on a language, and download them in all separate files.

and should be downloaded in a format like: (videotitle)-(videoid).(language)(-name if exists).(subtitle format) for example assembly above will be something like 조혜련과 태보의 저주-oIa3BFBHJFI.en-NES 6052 Assembly.vtt

--list-subs result

``` > youtube-dl --list-subs https://youtu.be/oIa3BFBHJFI [youtube] oIa3BFBHJFI: Downloading webpage Available automatic captions for oIa3BFBHJFI: Language formats mn vtt, ttml, srv3, srv2, srv1 eo vtt, ttml, srv3, srv2, srv1 ka vtt, ttml, srv3, srv2, srv1 ml vtt, ttml, srv3, srv2, srv1 kk vtt, ttml, srv3, srv2, srv1 ro vtt, ttml, srv3, srv2, srv1 mt vtt, ttml, srv3, srv2, srv1 tr vtt, ttml, srv3, srv2, srv1 sv vtt, ttml, srv3, srv2, srv1 ig vtt, ttml, srv3, srv2, srv1 it vtt, ttml, srv3, srv2, srv1 sq vtt, ttml, srv3, srv2, srv1 sm vtt, ttml, srv3, srv2, srv1 ha vtt, ttml, srv3, srv2, srv1 cy vtt, ttml, srv3, srv2, srv1 ms vtt, ttml, srv3, srv2, srv1 eu vtt, ttml, srv3, srv2, srv1 zu vtt, ttml, srv3, srv2, srv1 bs vtt, ttml, srv3, srv2, srv1 or vtt, ttml, srv3, srv2, srv1 si vtt, ttml, srv3, srv2, srv1 th vtt, ttml, srv3, srv2, srv1 yi vtt, ttml, srv3, srv2, srv1 lv vtt, ttml, srv3, srv2, srv1 az vtt, ttml, srv3, srv2, srv1 haw vtt, ttml, srv3, srv2, srv1 ja vtt, ttml, srv3, srv2, srv1 mg vtt, ttml, srv3, srv2, srv1 lt vtt, ttml, srv3, srv2, srv1 st vtt, ttml, srv3, srv2, srv1 ky vtt, ttml, srv3, srv2, srv1 te vtt, ttml, srv3, srv2, srv1 sn vtt, ttml, srv3, srv2, srv1 pt vtt, ttml, srv3, srv2, srv1 la vtt, ttml, srv3, srv2, srv1 uk vtt, ttml, srv3, srv2, srv1 ne vtt, ttml, srv3, srv2, srv1 af vtt, ttml, srv3, srv2, srv1 sd vtt, ttml, srv3, srv2, srv1 no vtt, ttml, srv3, srv2, srv1 da vtt, ttml, srv3, srv2, srv1 kn vtt, ttml, srv3, srv2, srv1 hi vtt, ttml, srv3, srv2, srv1 sl vtt, ttml, srv3, srv2, srv1 bn vtt, ttml, srv3, srv2, srv1 mi vtt, ttml, srv3, srv2, srv1 sr vtt, ttml, srv3, srv2, srv1 xh vtt, ttml, srv3, srv2, srv1 so vtt, ttml, srv3, srv2, srv1 zh-Hans vtt, ttml, srv3, srv2, srv1 lo vtt, ttml, srv3, srv2, srv1 bg vtt, ttml, srv3, srv2, srv1 fa vtt, ttml, srv3, srv2, srv1 jv vtt, ttml, srv3, srv2, srv1 fy vtt, ttml, srv3, srv2, srv1 mk vtt, ttml, srv3, srv2, srv1 pa vtt, ttml, srv3, srv2, srv1 nl vtt, ttml, srv3, srv2, srv1 vi vtt, ttml, srv3, srv2, srv1 fi vtt, ttml, srv3, srv2, srv1 ur vtt, ttml, srv3, srv2, srv1 ny vtt, ttml, srv3, srv2, srv1 hy vtt, ttml, srv3, srv2, srv1 zh-Hant vtt, ttml, srv3, srv2, srv1 es vtt, ttml, srv3, srv2, srv1 fr vtt, ttml, srv3, srv2, srv1 be vtt, ttml, srv3, srv2, srv1 gd vtt, ttml, srv3, srv2, srv1 tg vtt, ttml, srv3, srv2, srv1 tt vtt, ttml, srv3, srv2, srv1 is vtt, ttml, srv3, srv2, srv1 su vtt, ttml, srv3, srv2, srv1 my vtt, ttml, srv3, srv2, srv1 sk vtt, ttml, srv3, srv2, srv1 ht vtt, ttml, srv3, srv2, srv1 co vtt, ttml, srv3, srv2, srv1 tk vtt, ttml, srv3, srv2, srv1 lb vtt, ttml, srv3, srv2, srv1 et vtt, ttml, srv3, srv2, srv1 gu vtt, ttml, srv3, srv2, srv1 hr vtt, ttml, srv3, srv2, srv1 en vtt, ttml, srv3, srv2, srv1 ar vtt, ttml, srv3, srv2, srv1 fil vtt, ttml, srv3, srv2, srv1 ps vtt, ttml, srv3, srv2, srv1 mr vtt, ttml, srv3, srv2, srv1 iw vtt, ttml, srv3, srv2, srv1 am vtt, ttml, srv3, srv2, srv1 ku vtt, ttml, srv3, srv2, srv1 el vtt, ttml, srv3, srv2, srv1 rw vtt, ttml, srv3, srv2, srv1 uz vtt, ttml, srv3, srv2, srv1 ta vtt, ttml, srv3, srv2, srv1 ga vtt, ttml, srv3, srv2, srv1 hu vtt, ttml, srv3, srv2, srv1 id vtt, ttml, srv3, srv2, srv1 ceb vtt, ttml, srv3, srv2, srv1 ko vtt, ttml, srv3, srv2, srv1 cs vtt, ttml, srv3, srv2, srv1 ug vtt, ttml, srv3, srv2, srv1 sw vtt, ttml, srv3, srv2, srv1 hmn vtt, ttml, srv3, srv2, srv1 de vtt, ttml, srv3, srv2, srv1 ca vtt, ttml, srv3, srv2, srv1 gl vtt, ttml, srv3, srv2, srv1 km vtt, ttml, srv3, srv2, srv1 yo vtt, ttml, srv3, srv2, srv1 pl vtt, ttml, srv3, srv2, srv1 ru vtt, ttml, srv3, srv2, srv1 Available subtitles for oIa3BFBHJFI: Language formats mn vtt, ttml, srv3, srv2, srv1 eo vtt, ttml, srv3, srv2, srv1 ka vtt, ttml, srv3, srv2, srv1 ml vtt, ttml, srv3, srv2, srv1 kk vtt, ttml, srv3, srv2, srv1 ro vtt, ttml, srv3, srv2, srv1 su vtt, ttml, srv3, srv2, srv1 mt vtt, ttml, srv3, srv2, srv1 tr vtt, ttml, srv3, srv2, srv1 sv vtt, ttml, srv3, srv2, srv1 my vtt, ttml, srv3, srv2, srv1 ro-MD vtt, ttml, srv3, srv2, srv1 as vtt, ttml, srv3, srv2, srv1 sq vtt, ttml, srv3, srv2, srv1 sm vtt, ttml, srv3, srv2, srv1 ha vtt, ttml, srv3, srv2, srv1 cy vtt, ttml, srv3, srv2, srv1 ms vtt, ttml, srv3, srv2, srv1 eu vtt, ttml, srv3, srv2, srv1 zu vtt, ttml, srv3, srv2, srv1 bs vtt, ttml, srv3, srv2, srv1 nan-TW vtt, ttml, srv3, srv2, srv1 si vtt, ttml, srv3, srv2, srv1 yi vtt, ttml, srv3, srv2, srv1 lv vtt, ttml, srv3, srv2, srv1 az vtt, ttml, srv3, srv2, srv1 ja vtt, ttml, srv3, srv2, srv1 te vtt, ttml, srv3, srv2, srv1 bo vtt, ttml, srv3, srv2, srv1 sa vtt, ttml, srv3, srv2, srv1 pa vtt, ttml, srv3, srv2, srv1 lt vtt, ttml, srv3, srv2, srv1 st vtt, ttml, srv3, srv2, srv1 ky vtt, ttml, srv3, srv2, srv1 sdp vtt, ttml, srv3, srv2, srv1 zh-SG vtt, ttml, srv3, srv2, srv1 sn vtt, ttml, srv3, srv2, srv1 pt vtt, ttml, srv3, srv2, srv1 la vtt, ttml, srv3, srv2, srv1 br vtt, ttml, srv3, srv2, srv1 uk vtt, ttml, srv3, srv2, srv1 zh-TW vtt, ttml, srv3, srv2, srv1 ne vtt, ttml, srv3, srv2, srv1 af vtt, ttml, srv3, srv2, srv1 sd vtt, ttml, srv3, srv2, srv1 no vtt, ttml, srv3, srv2, srv1 hak vtt, ttml, srv3, srv2, srv1 mi vtt, ttml, srv3, srv2, srv1 hi vtt, ttml, srv3, srv2, srv1 zh-HK vtt, ttml, srv3, srv2, srv1 hy vtt, ttml, srv3, srv2, srv1 cs vtt, ttml, srv3, srv2, srv1 yue vtt, ttml, srv3, srv2, srv1 mr vtt, ttml, srv3, srv2, srv1 kn vtt, ttml, srv3, srv2, srv1 sr vtt, ttml, srv3, srv2, srv1 so vtt, ttml, srv3, srv2, srv1 zh-Hans vtt, ttml, srv3, srv2, srv1 lo vtt, ttml, srv3, srv2, srv1 tlh vtt, ttml, srv3, srv2, srv1 bg vtt, ttml, srv3, srv2, srv1 fa vtt, ttml, srv3, srv2, srv1 es-419 vtt, ttml, srv3, srv2, srv1 it vtt, ttml, srv3, srv2, srv1 sr-Cyrl vtt, ttml, srv3, srv2, srv1 fa-IR vtt, ttml, srv3, srv2, srv1 fy vtt, ttml, srv3, srv2, srv1 mk vtt, ttml, srv3, srv2, srv1 nl vtt, ttml, srv3, srv2, srv1 wo vtt, ttml, srv3, srv2, srv1 bho vtt, ttml, srv3, srv2, srv1 vi vtt, ttml, srv3, srv2, srv1 ak vtt, ttml, srv3, srv2, srv1 fi vtt, ttml, srv3, srv2, srv1 sl vtt, ttml, srv3, srv2, srv1 zh-Hant vtt, ttml, srv3, srv2, srv1 fj vtt, ttml, srv3, srv2, srv1 es vtt, ttml, srv3, srv2, srv1 fr vtt, ttml, srv3, srv2, srv1 gd vtt, ttml, srv3, srv2, srv1 fr-CA vtt, ttml, srv3, srv2, srv1 tt vtt, ttml, srv3, srv2, srv1 is vtt, ttml, srv3, srv2, srv1 ca vtt, ttml, srv3, srv2, srv1 de-DE vtt, ttml, srv3, srv2, srv1 ig vtt, ttml, srv3, srv2, srv1 da vtt, ttml, srv3, srv2, srv1 na vtt, ttml, srv3, srv2, srv1 sk vtt, ttml, srv3, srv2, srv1 th vtt, ttml, srv3, srv2, srv1 ie vtt, ttml, srv3, srv2, srv1 co vtt, ttml, srv3, srv2, srv1 tk vtt, ttml, srv3, srv2, srv1 tn vtt, ttml, srv3, srv2, srv1 ru vtt, ttml, srv3, srv2, srv1 lb vtt, ttml, srv3, srv2, srv1 et vtt, ttml, srv3, srv2, srv1 es-US vtt, ttml, srv3, srv2, srv1 gu vtt, ttml, srv3, srv2, srv1 hr vtt, ttml, srv3, srv2, srv1 en vtt, ttml, srv3, srv2, srv1 ar vtt, ttml, srv3, srv2, srv1 fil vtt, ttml, srv3, srv2, srv1 zh-CN vtt, ttml, srv3, srv2, srv1 iw vtt, ttml, srv3, srv2, srv1 am vtt, ttml, srv3, srv2, srv1 en-GB vtt, ttml, srv3, srv2, srv1 ku vtt, ttml, srv3, srv2, srv1 el vtt, ttml, srv3, srv2, srv1 uz vtt, ttml, srv3, srv2, srv1 ta vtt, ttml, srv3, srv2, srv1 ga vtt, ttml, srv3, srv2, srv1 hu vtt, ttml, srv3, srv2, srv1 id vtt, ttml, srv3, srv2, srv1 ko vtt, ttml, srv3, srv2, srv1 pt-BR vtt, ttml, srv3, srv2, srv1 es-ES vtt, ttml, srv3, srv2, srv1 sw vtt, ttml, srv3, srv2, srv1 ia vtt, ttml, srv3, srv2, srv1 xh vtt, ttml, srv3, srv2, srv1 es-MX vtt, ttml, srv3, srv2, srv1 en-US vtt, ttml, srv3, srv2, srv1 gl vtt, ttml, srv3, srv2, srv1 km vtt, ttml, srv3, srv2, srv1 yo vtt, ttml, srv3, srv2, srv1 pl vtt, ttml, srv3, srv2, srv1 de vtt, ttml, srv3, srv2, srv1 ```

ytdl-org / youtube-dl