Support vod.afreecatv.com (alternate URL structure for already supported Afreeca videos)

[msikma]

• I've verified and I assure that I'm running youtube-dl 2016.11.08.1
• At least skimmed through README and most notably FAQ and BUGS sections
• Searched the bugtracker for similar issues including closed ones

What is the purpose of your issue?

• Bug report (encountered problems with youtube-dl)
• Site support request (request for adding support for a new site)
• Feature request (request for a new functionality)
• Question
• Other

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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: http://vod.afreecatv.com/PLAYER/STATION/15055030

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Description of your issue, suggested solution and other information

Currently, when loading links starting with vod.afreecatv.com, youtube-dl fails to download the video:

$ youtube-dl "http://vod.afreecatv.com/PLAYER/STATION/15055030"
[generic] 15055030: Requesting header
WARNING: Falling back on generic information extractor.
[generic] 15055030: Downloading webpage
[generic] 15055030: Extracting information
ERROR: Unsupported URL: http://vod.afreecatv.com/PLAYER/STATION/15055030

There are actually alternate URLs for videos of this structure which do work with youtube-dl. See the following example:

$ youtube-dl "http://www.afreecatv.com/player/player.html?nTitleNo=15055030"
[AfreecaTV] 15055030: Downloading XML
[download] Downloading playlist: [생] 이제동 첫방송! 안녕하세요 이제동입니다
[AfreecaTV] playlist [생] 이제동 첫방송! 안녕하세요 이제동입니다: Collected 4 video ids (downloading 4 of them)
[download] Downloading video 1 of 4
[download] Destination: [생] 이제동 첫방송! 안녕하세요 이제동입니다-15055030_1.mp4
[download]  47.8% of 1.48GiB at  2.90MiB/s ETA 04:33
[...]

This is exactly the same video, and it works fine with youtube-dl. The only thing you need is the ID, so the working URL can be inferred from the non-working URL directly. The "PLAYER/STATION" part isn't necessary.