[C-Span] Downloading extra videos after the first one

[NathanWailes]

• I've verified and I assure that I'm running youtube-dl 2017.09.15
• At least skimmed through the README, most notably the FAQ and BUGS sections
• Searched the bugtracker for similar issues including closed ones
• Bug report (encountered problems with youtube-dl)

---

The code I used:

from __future__ import unicode_literals
import youtube_dl


class MyLogger(object):
    def debug(self, msg):
        pass

    def warning(self, msg):
        pass

    def error(self, msg):
        print(msg)


def my_hook(d):
    if d['status'] == 'finished':
        print('Done downloading, now converting ...')


ydl_opts = {
    'format': 'bestaudio/best',
    'postprocessors': [{
        'key': 'FFmpegExtractAudio',
        'preferredcodec': 'flac',
        'preferredquality': '192',
    }],
    'max-downloads': 1,
    'verbose': True,
    'logger': MyLogger(),
    'progress_hooks': [my_hook],
}
with youtube_dl.YoutubeDL(ydl_opts) as ydl:
    ydl.download(['https://www.c-span.org/video/?427932-1/former-president-obama-defends-affordable-care-act'])

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The full verbose output:

[debug] Encodings: locale cp1252, fs mbcs, out UTF-8, pref cp1252
[debug] youtube-dl version 2017.09.15
[debug] Git HEAD: 98f91b2
[debug] Python version 3.5.2 - Windows-10-10.0.15063-SP0
[debug] exe versions: ffmpeg N-87294-gec1573f, ffprobe N-87294-gec1573f
[debug] Proxy map: {}
Done downloading, now converting ...
Done downloading, now converting ...
Done downloading, now converting ...

Process finished with exit code 0

---

Example URLs:

• Single video: C-Span - President Obama Profile in Courage Award

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Description of your issue, suggested solution and other information

I want to be able to download audio versions of C-Span videos, but in the first video I tried, it downloaded three videos. The first video was the length of the video I wanted to get the audio from (~1 hour 11 minutes), while the second and third videos were around 45-minutes each and seemed to be completely different events. My guess is that a second and third videos were auto-played after the first one, and that youtube-dl didn't recognize them as being different.

I tried setting the max-downloads option to 1, but the second and third videos were still downloaded.

[remitamine]

Duplicate of #13030.