[C-SPAN] Download "User-Created Clip"

[DEVoytas]

• I've verified and I assure that I'm running youtube-dl 2018.08.28

$ youtube-dl --version
2018.08.28

I have:

• At least skimmed through the README, most notably the FAQ and BUGS sections
• Searched the bugtracker for similar issues including closed ones
• Checked that provided video/audio/playlist URLs (if any) are alive and playable in a browser

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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$ youtube-dl -F -v  https://www.c-span.org/video/?c4482230/bernanke-subprime
[debug] System config: []
[debug] User config: []
[debug] Custom config: []
[debug] Command-line args: [u'-F', u'-v', u'https://www.c-span.org/video/?c4482230/bernanke-subprime']
[debug] Encodings: locale UTF-8, fs UTF-8, out UTF-8, pref UTF-8
[debug] youtube-dl version 2018.08.28
[debug] Python version 2.7.12 (CPython) - Linux-4.10.0-38-generic-x86_64-with-LinuxMint-18.3-sylvia
[debug] exe versions: avconv 3.4.4-1, avprobe 3.4.4-1, ffmpeg 3.4.4-1, ffprobe 3.4.4-1
[debug] Proxy map: {}
[CSpan] c4482230: Downloading webpage
[CSpan] 171649: Downloading JSON metadata
[CSpan] 171649: Downloading XML
[download] Downloading playlist: Economic Outlook
[CSpan] playlist Economic Outlook: Collected 2 video ids (downloading 2 of them)
[download] Downloading video 1 of 2
[info] Available formats for 171649_1:
format code  extension  resolution note
224-234p     mp4        234p        224k 
628-360p     mp4        360p        628k 
4000-576p    mp4        576p       4000k  (best)
[download] Downloading video 2 of 2
[info] Available formats for 171649_2:
format code  extension  resolution note
224-234p     mp4        234p        224k 
628-360p     mp4        360p        628k 
4000-576p    mp4        576p       4000k  (best)
[download] Finished downloading playlist: Economic Outlook

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Description of your issue, suggested solution and other information

C-Span gives the user ability to create "User-Created Clips" which allows user to create shorter clips from the original content.
At the moment youtube-dl does not seem to support them, i.e. even when one tries to download user created clip by supplying its URL, original content gets downloaded instead.
For example, this URL:
https://www.c-span.org/video/?c4482230/bernanke-subprime
links to a a short (< 2min) clip. But when one attempts to download it, two big (> 1.5h each) videos gets downloaded (debug output above).
My question is: is it currently possible to somehow download those clips, and if it's not, would it be possible to add such feature?

PS.
I realize it may well be duplicate of #622 but it may be not (depending on how C-Span handles those clips).

[rpvcg]

youtube-dl parses the "programid" from the source video from which the clip was created.

Within the page souce of the clip page is a hls url which contains just the clip contents. For your example it is:
https://iphone.c-spanvideo.org/m3u8/clip.4479003.m3u8

Some logic would be needed in order to add the clip hls url to the source qualities. Usually the programid sources are preferred.