Question subtitle get language English

[mahmoudgad94]

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youtube-dl -v

D:\MahmoudGad\projects\youtube_subtitle>youtube-dl -v
[debug] System config: []
[debug] User config: []
[debug] Custom config: []
[debug] Command-line args: ['-v']
[debug] Encodings: locale cp1256, fs utf-8, out utf-8, pref cp1256
[debug] youtube-dl version 2019.03.18
[debug] Python version 3.7.2 (CPython) - Windows-8.1-6.3.9600-SP0
[debug] exe versions: none
[debug] Proxy map: {}

I'm had Question about subtitle I don't know if this is a bug or not I'm using python and execute library youtube-dl
now I'm using the next code to get requested_subtitles VTT English URL this

https://www.youtube.com/api/timedtext?expire=1553183441&....&lang=ar&tlang=en&fmt=vtt
so my question or problem is with lang = ar I don't know how to change this and this to return difference subtitle English and when changing this manual to lang=en the subtitle is working well

`ydl_opts = {
'skip_download': True,
'ignoreerrors':True,
'extract_flat':True,
'writeautomaticsub': True,
'subtitleslangs': ['en'],
'writesubtitles':False,
}
video_id = id
with youtube_dl.YoutubeDL(ydl_opts) as ydl:
result = ydl.extract_info(http://www.youtube.com/watch?v='+video_id,False)

`