Only first of multiple embedded videos in page downloaded

[gromgit]

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I ran youtube-dl on this URL that has two embedded Vimeo videos, but only the first one on the page gets downloaded:

$ youtube-dl -v --ignore-config http://www.ukuleletricks.com/thumb-and-strum/
[debug] System config: []
[debug] User config: []
[debug] Command-line args: [u'-v', u'--ignore-config', u'http://www.ukuleletricks.com/thumb-and-strum/']
[debug] Encodings: locale UTF-8, fs UTF-8, out UTF-8, pref UTF-8
[debug] youtube-dl version 2016.10.02
[debug] Python version 2.7.12 - Linux-4.4.0-38-generic-x86_64-with-Ubuntu-16.04-xenial
[debug] exe versions: ffmpeg 2.8.6-1ubuntu2, ffprobe 2.8.6-1ubuntu2
[debug] Proxy map: {}
[generic] thumb-and-strum: Requesting header
WARNING: Falling back on generic information extractor.
[generic] thumb-and-strum: Downloading webpage
[generic] thumb-and-strum: Extracting information
[vimeo] 184872211: Downloading webpage
[vimeo] 184872211: Extracting information
[vimeo] 184872211: Downloading JSON metadata
[vimeo] 184872211: Downloading m3u8 information
[debug] Invoking downloader on u'https://fpdl.vimeocdn.com/vimeo-prod-skyfire-std-us/01/1974/7/184872211/609540883.mp4?token=57f653d0_0xc9a38d7c78410980788b796400bb4cd4322e901d'
[download] Destination: 6-1 Fast Uptempo Strumming Techniques-184872211.mp4
[download] 100% of 30.31MiB in 00:06

I've confirmed that both embedded videos are playable.

This may be related to #10179 (closed).