[NBC] IndexError: list index out of range

[Mr-Jake]

• I've verified and I assure that I'm running youtube-dl 2017.10.01

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• At least skimmed through the README, most notably the 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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youtube-dl 2017.05.07 Log:

C:\youtube-dl\youtube-dl-2017.05.07.exe "https://www.nbc.com/americas-got-talent/video/semifinals-2/3580576" -F -v

[NBC] 3580576: Downloading webpage
[ThePlatform] 3580576: Downloading SMIL data
[ThePlatform] 3580576: Downloading m3u8 information
[ThePlatform] 3580576: Downloading JSON metadata
[info] Available formats for 3580576:
format code  extension  resolution note
hls-75       mp4        audio only   75k , mp4a.40.2
hls-290      mp4        416x240     290k , avc1.66.30, mp4a.40.2
hls-490      mp4        416x240     490k , avc1.66.30, mp4a.40.2
hls-789      mp4        1920x1080   789k , avc1.66.30, mp4a.40.2
hls-1291     mp4        960x544    1291k , avc1.66.30, mp4a.40.2
hls-1933     mp4        960x544    1933k , avc1.77.30, mp4a.40.2
hls-2650     mp4        1280x720   2650k , avc1.77.30, mp4a.40.2
hls-4185     mp4        1920x1080  4185k , avc1.77.30, mp4a.40.2 (best)

youtube-dl 2017.05.09 and youtube-dl 2017.10.01 Log:

C:\youtube-dl\youtube-dl-2017.05.09.exe "https://www.nbc.com/americas-got-talent/video/semifinals-2/3580576" -F -v

C:\youtube-dl\youtube-dl-2017.10.01.exe "https://www.nbc.com/americas-got-talent/video/semifinals-2/3580576" -F -v

[NBC] 3580576: Downloading JSON metadata
Traceback (most recent call last):
  File "__main__.py", line 19, in <module>
  File "C:\Users\dst\AppData\Roaming\Build archive\youtube-dl\rg3\tmpf3fd6ifp\build\youtube_dl\__init__.py", line 465, in main
  File "C:\Users\dst\AppData\Roaming\Build archive\youtube-dl\rg3\tmpf3fd6ifp\build\youtube_dl\__init__.py", line 455, in _real_main
  File "C:\Users\dst\AppData\Roaming\Build archive\youtube-dl\rg3\tmpf3fd6ifp\build\youtube_dl\YoutubeDL.py", line 1974, in download
  File "C:\Users\dst\AppData\Roaming\Build archive\youtube-dl\rg3\tmpf3fd6ifp\build\youtube_dl\YoutubeDL.py", line 783, in extract_info
  File "C:\Users\dst\AppData\Roaming\Build archive\youtube-dl\rg3\tmpf3fd6ifp\build\youtube_dl\extractor\common.py", line 434, in extract
  File "C:\Users\dst\AppData\Roaming\Build archive\youtube-dl\rg3\tmpf3fd6ifp\build\youtube_dl\extractor\nbc.py", line 78, in _real_extract
IndexError: list index out of range

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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):

https://www.nbc.com/americas-got-talent/video/semifinals-2/3580576

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Description of your issue, suggested solution and other information

I encountered an error using youtube-dl to download America's Got Talent from NBC.

NBC works with youtube-dl 2017.05.07, but it is broken starting with youtube-dl 2017.05.09 to the present version youtube-dl 2017.10.01.

Download an AGT episode with youtube-dl 2017.05.07 and it works. Download the same episode with a later version and it fails. There was a NBC commit that was put into 2017.05.09 that I believe breaks it. I provided episode links above.