[Youtube] Swapped codec descriptions for -f 171 and 43

[VADemon]

• I've verified and I assure that I'm running youtube-dl 2018.01.07

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• Searched the bugtracker for similar issues including closed ones

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[debug] System config: []
[debug] User config: ['--rate-limit', '4.2M', '-f', 'bestvideo[height<=720]+bestaudio/bestvideo[width<=1920]+bestaudio/bestvideo+bestaudio/best']
[debug] Custom config: []
[debug] Command-line args: ['-F', '-v', 'https://www.youtube.com/watch?v=yXuaK6SV_6Y']
[debug] Encodings: locale cp1251, fs mbcs, out cp1251, pref cp1251
[debug] youtube-dl version 2018.01.07
[debug] Python version 3.4.4 (CPython) - Windows-7-6.1.7601-SP1
[debug] exe versions: ffmpeg N-75504-gaa6c43f, ffprobe N-75504-gaa6c43f
[debug] Proxy map: {}
...
[youtube] yXuaK6SV_6Y: Downloading webpage
[youtube] yXuaK6SV_6Y: Downloading video info webpage
[youtube] yXuaK6SV_6Y: Extracting video information
[info] Available formats for yXuaK6SV_6Y:
format code  extension  resolution note
140          m4a        audio only DASH audio  127k , m4a_dash container, mp4a.40.2@128k, 1.99MiB
171          webm       audio only DASH audio  137k , 1fps, vorbis@128k, 1.87MiB
160          mp4        256x144    144p  128k , avc1.4d400c, 15fps, video only, 1.66MiB
133          mp4        426x240    240p  253k , avc1.4d4015, 30fps, video only, 3.83MiB
134          mp4        640x360    360p  605k , avc1.4d401e, 30fps, video only, 7.73MiB
135          mp4        854x480    480p 1200k , avc1.4d401f, 30fps, video only, 17.06MiB
136          mp4        1280x720   720p 2221k , avc1.4d401f, 30fps, video only, 34.28MiB
17           3gp        176x144    small , mp4v.20.3, mp4a.40.2@ 24k
36           3gp        320x180    small , mp4v.20.3, mp4a.40.2
43           webm       640x360    medium , vp8.0, vorbis@128k
18           mp4        640x360    medium , avc1.42001E, mp4a.40.2@ 96k
22           mp4        1280x720   hd720 , avc1.64001F, mp4a.40.2@192k (best)

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URL: https://www.youtube.com/watch?v=yXuaK6SV_6Y

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The audio codec -f 171 is wrongly detected to be "1 fps" and -f 43 video codec returns vorbis@128k. I don't know how to double-check if it's maybe Youtube's fault, sorry.

[dstftw]

171 is what youtube provides.
43 is hardcoded data.