Subtitles (CC) are not downloaded on JW Player videos

[Gandulf78]

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If the purpose of this issue is a bug report, site support request or you are not completely sure provide the full verbose output as follows:

Add the -v flag to your command line you run youtube-dl with (youtube-dl -v <your command line>), copy the whole output and insert it here. It should look similar to one below (replace it with your log inserted between triple ```):

youtube-dl -v --write-auto-sub --sub-lang fr,en --write-sub --embed-subs https://www.tv5mondeplus.com/toutes-les-videos/documentaire/merci-professeur--ballotage
[debug] System config: []
[debug] User config: []
[debug] Custom config: []
[debug] Command-line args: [u'-v', u'--write-auto-sub', u'--sub-lang', u'fr,en', u'--write-sub', u'--embed-subs', u'https://www.tv5mondeplus.com/toutes-les-videos/documentaire/merci-professeur--ballotage']
[debug] Encodings: locale UTF-8, fs utf-8, out UTF-8, pref UTF-8
[debug] youtube-dl version 2018.10.05
[debug] Python version 2.7.15 (CPython) - Darwin-18.0.0-x86_64-i386-64bit
[debug] exe versions: ffmpeg 4.0.2, ffprobe 4.0.2
[debug] Proxy map: {}
[TV5MondePlus] merci-professeur--ballotage: Downloading webpage
[debug] Default format spec: bestvideo+bestaudio/best
[debug] Invoking downloader on u'https://dlhd.tv5monde.com/tv5mondeplus/hq/3842774.mp4'
[download] Destination: Merci professeur !  - Ballotage-merci-professeur--ballotage.mp4
[download] 100% of 9.34MiB in 00:00
[ffmpeg] There aren't any subtitles to embed
...
<end of log>

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If the purpose of this issue is a site support request please provide all kinds of example URLs support for which should be included (replace following example URLs by yours):

• Single video: https://www.tv5mondeplus.com/toutes-les-videos/documentaire/merci-professeur--poubelle

Note that youtube-dl does not support sites dedicated to copyright infringement. In order for site support request to be accepted all provided example URLs should not violate any copyrights.

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Description of your issue, suggested solution and other information

The video (JW Player 7.12.13) is well downloaded by youtube-dl but the subtitles are not detected / downloaded.

Explanation of your issue in arbitrary form goes here. Please make sure the description is worded well enough to be understood. Provide as much context and examples as possible.
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[qkolj]

As your verbose output shows, the problem is that the existing extractor for TV5MondePlus does not support extraction of subtitles. I added subtitle extraction in #17882

Also, a side note: --write-auto-sub only works for YouTube (check youtube-dl's manpage).

[evnb]

I'm not familiar with how youtube-dl finds the ts files for JW Player but I was able to manually find subtitle files for a number of JW videos. It seems the subtitles are split into a number of VTT files stored in the same directory as the ts files. Similar to the ts files, the VTT files all have the same name besides ending with an incremented 'n.vtt' where n is a number greater than or equal to 0. Each vtt file seems to cover roughly 3 minutes.