Audio only format has FPS

[0x9fff00]

Checklist

• I'm reporting a broken site support issue
• I've verified that I'm running youtube-dl version 2019.07.02
• I've checked that all provided URLs are alive and playable in a browser
• I've checked that all URLs and arguments with special characters are properly quoted or escaped
• I've searched the bugtracker for similar bug reports including closed ones
• I've read bugs section in FAQ

Verbose log

youtube-dl -v -F https://www.youtube.com/watch?v=BruL0iJW6Ok
[debug] System config: []
[debug] User config: []
[debug] Custom config: []
[debug] Command-line args: ['-v', '-F', 'https://www.youtube.com/watch?v=BruL0iJW6Ok']
[debug] Encodings: locale UTF-8, fs utf-8, out UTF-8, pref UTF-8
[debug] youtube-dl version 2019.07.02
[debug] Python version 3.7.3 (CPython) - Linux-5.1.15-arch1-1-ARCH-x86_64-with-arch
[debug] exe versions: ffmpeg 4.1.3, ffprobe 4.1.3, rtmpdump 2.4
[debug] Proxy map: {}
[youtube] BruL0iJW6Ok: Downloading webpage
[youtube] BruL0iJW6Ok: Downloading video info webpage
[info] Available formats for BruL0iJW6Ok:
format code  extension  resolution note
249          webm       audio only DASH audio   51k , opus @ 50k, 576.61KiB
250          webm       audio only DASH audio   70k , opus @ 70k, 736.60KiB
171          webm       audio only DASH audio   90k , 1fps, vorbis@128k, 962.22KiB
140          m4a        audio only DASH audio  129k , m4a_dash container, mp4a.40.2@128k, 1.42MiB
251          webm       audio only DASH audio  151k , opus @160k, 1.55MiB
160          mp4        192x144    144p  110k , avc1.4d400c, 15fps, video only, 1.21MiB
133          mp4        320x240    240p  246k , avc1.4d400d, 30fps, video only, 2.70MiB
134          mp4        480x360    360p  276k , avc1.4d401e, 30fps, video only, 2.70MiB
135          mp4        640x480    480p  580k , avc1.4d401e, 30fps, video only, 5.65MiB
18           mp4        480x360    medium , avc1.42001E, mp4a.40.2@ 96k, 5.13MiB
43           webm       640x360    medium , vp8.0, vorbis@128k, 6.98MiB (best)

Description

Format 171 of this video is shown as having 1 FPS, which doesn't make sense as it is an audio only format.

[dstftw]

Blame Youtube for providing invalid metadata.