New imgur videos

[Meneth32]

Make sure you are using the latest version: run youtube-dl --version and ensure your version is 2018.12.03. If it's not, read this FAQ entry and update. Issues with outdated version will be rejected.

• I've verified and I assure that I'm running youtube-dl 2018.12.03

Before submitting an issue make sure you 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

[debug] System config: []
[debug] User config: []
[debug] Custom config: []
[debug] Command-line args: ['--verbose', 'https://imgur.com/GPnMEcs']
[debug] Encodings: locale cp1252, fs mbcs, out cp850, pref cp1252
[debug] youtube-dl version 2018.12.03
[debug] Git HEAD: 5547014ad
[debug] Python version 3.5.3 (CPython) - Windows-7-6.1.7601-SP1
[debug] exe versions: ffmpeg N-82721-g89092fa, ffprobe N-82721-g89092fa, phantomjs 2.1.1
[debug] Proxy map: {}
[Imgur] GPnMEcs: Downloading webpage
ERROR: No sources found for video GPnMEcs. Maybe an image?
Traceback (most recent call last):
  File "youtube_dl\YoutubeDL.py", line 792, in extract_info
    ie_result = ie.extract(url)
  File "youtube_dl\extractor\common.py", line 508, in extract
    ie_result = self._real_extract(url)
  File "youtube_dl\extractor\imgur.py", line 67, in _real_extract
    expected=True)
youtube_dl.utils.ExtractorError: No sources found for video GPnMEcs. Maybe an image?

...
<end of log>

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Description of your issue, suggested solution and other information

New imgur videos seem to use some new system not yet supported by youtube-dl. However, Firefox can save mp4 files as usual.

This error does not occur with older videos.

[ealgase]

That image isn't available for me (returns a not found page). Can you give another example?

[Meneth32]

https://imgur.com/gallery/GPnMEcs (works in browser but youtube-dl strips the "gallery" part and goes 404)
https://imgur.com/a/GPnMEcs ("WARNING: Falling back on generic information extractor.", lots of "Got server HTTP error")
https://imgur.com/zzn6218 (works in both browser and youtube-dl).