Youtube format selection `vcodec=vp9` falsely selects HDR `vp9.2`

[ddelange]

Checklist

• I'm reporting a broken site support issue
• I've verified that I'm running youtube-dl version 2019.04.24
• 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 "(bestvideo[vcodec=vp9,height<=2160]/bestvideo[vcodec!=vp9.2,height<=2160])+(bestaudio[acodec=opus]/bestaudio)/best[height<=2160]" -i https://www.youtube.com/watch?v=ESxIaJWUtAs
[debug] System config: []
[debug] User config: []
[debug] Custom config: []
[debug] Command-line args: [u'-v', u'-f', u'(bestvideo[vcodec=vp9,height<=2160]/bestvideo[vcodec!=vp9.2,height<=2160])+(bestaudio[acodec=opus]/bestaudio)/best[height<=2160]', u'-i', u'https://www.youtube.com/watch?v=ESxIaJWUtAs']
[debug] Encodings: locale UTF-8, fs utf-8, out UTF-8, pref UTF-8
[debug] youtube-dl version 2019.04.24
[debug] Python version 2.7.13 (CPython) - Darwin-12.5.0-x86_64-i386-64bit
[debug] exe versions: ffmpeg 3.4.1, ffprobe 3.4.1
[debug] Proxy map: {}
[youtube] ESxIaJWUtAs: Downloading webpage
[youtube] ESxIaJWUtAs: Downloading video info webpage
[debug] Invoking downloader on u'https://r4---sn-4g5e6nl7.googlevideo.com/videoplayback?id=o-ACkzsVUz8QLa9sSimX2BFEXdZYr9i80PZA7wzv8jltYS&aitags=133%2C134%2C135%2C136%2C137%2C160%2C242%2C243%2C244%2C247%2C248%2C271%2C278%2C313%2C330%2C331%2C332%2C333%2C334%2C335%2C336%2C337&itag=337&source=youtube&requiressl=yes&mm=31%2C26&mn=sn-4g5e6nl7%2Csn-5hnednlr&ms=au%2Conr&mv=m&pl=22&ei=9-PFXK7dDYKOgQfJp5OQCw&initcwndbps=1531250&mime=video%2Fwebm&gir=yes&clen=78146927&dur=29.695&lmt=1545380439738475&mt=1556472708&fvip=4&keepalive=yes&c=WEB&txp=2211222&ip=31.16.253.220&ipbits=0&expire=1556494423&sparams=ip%2Cipbits%2Cexpire%2Cid%2Caitags%2Csource%2Crequiressl%2Cmm%2Cmn%2Cms%2Cmv%2Cpl%2Cei%2Cinitcwndbps%2Cmime%2Cgir%2Cclen%2Cdur%2Clmt&signature=EE9DEAB8FCAFAF77834CBEDB55CCDA4D1C85099A.2DED8350EEEF8AF47A5A64B3D1CC6C581DF4D1E5&key=yt8&ratebypass=yes'
[download] Resuming download at byte 14517802
[download] Destination: Planet Earth II - Hummingbirds (HDR - 4K - 5.1)-ESxIaJWUtAs.f337.webm

Description

When trying to download videos from Youtube, I prefer using the vp9 video codec due to its size. However, HDR videos (vp9.2 codec) are of course much bigger, and are therefore unwanted. What I want is to download is the webm format (but not HDR), and mp4 format if webm is not available.

To achieve this, I want to use the format selection (for 2160p) "(bestvideo[vcodec=vp9,height<=2160]/bestvideo[vcodec!=vp9.2,height<=2160])+(bestaudio[acodec=opus]/bestaudio)/best[height<=2160]". But as can be seen above, this downloads 337 (vp9.2), while I exprected 313 (vp9). It looks like the vcodec= keyword does a simple 'contains', instead of an exact match, resulting in the wrong format being downloaded. When I remove the format selection up to the first /, the result is the same (337 being downloaded).

It gets even weirder: when I change the first 2160 to 1080, format 137 gets downloaded, which is not the expected (incorrect) 1080p HDR, but the 1080p mp4 (which is <=1080 yet avc1.640028 codec. Intended behaviour would be downloading 248 in this case.

What is going wrong here?

[info] Available formats for ESxIaJWUtAs:
format code  extension  resolution note
249          webm       audio only DASH audio   51k , opus @ 50k, 179.12KiB
250          webm       audio only DASH audio   67k , opus @ 70k, 236.21KiB
171          webm       audio only DASH audio  123k , vorbis@128k, 422.59KiB
140          m4a        audio only DASH audio  130k , m4a_dash container, mp4a.40.2@128k, 471.50KiB
251          webm       audio only DASH audio  134k , opus @160k, 470.61KiB
256          m4a        audio only DASH audio  196k , m4a_dash container, mp4a.40.5, 712.58KiB
258          m4a        audio only DASH audio  389k , m4a_dash container, mp4a.40.2, 1.38MiB
278          webm       256x144    144p   94k , webm container, vp9, 24fps, video only, 331.51KiB
160          mp4        256x144    144p  127k , avc1.4d400c, 24fps, video only, 445.23KiB
330          webm       256x144    144p HDR  132k , vp9.2, 24fps, video only, 390.57KiB
242          webm       426x240    240p  204k , vp9, 24fps, video only, 692.59KiB
331          webm       426x240    240p HDR  225k , vp9.2, 24fps, video only, 646.24KiB
133          mp4        426x240    240p  280k , avc1.4d4015, 24fps, video only, 970.33KiB
243          webm       640x360    360p  373k , vp9, 24fps, video only, 1.21MiB
332          webm       640x360    360p HDR  481k , vp9.2, 24fps, video only, 1.45MiB
134          mp4        640x360    360p  642k , avc1.4d401e, 24fps, video only, 1.97MiB
244          webm       854x480    480p  721k , vp9, 24fps, video only, 2.14MiB
333          webm       854x480    480p HDR  883k , vp9.2, 24fps, video only, 2.69MiB
135          mp4        854x480    480p 1291k , avc1.4d401e, 24fps, video only, 3.82MiB
247          webm       1280x720   720p 1409k , vp9, 24fps, video only, 4.05MiB
334          webm       1280x720   720p HDR 1986k , vp9.2, 24fps, video only, 6.38MiB
248          webm       1920x1080  1080p 2339k , vp9, 24fps, video only, 7.02MiB
136          mp4        1280x720   720p 2392k , avc1.4d401f, 24fps, video only, 7.01MiB
335          webm       1920x1080  1080p HDR 3583k , vp9.2, 24fps, video only, 11.72MiB
137          mp4        1920x1080  1080p 4160k , avc1.640028, 24fps, video only, 12.59MiB
271          webm       2560x1440  1440p 6741k , vp9, 24fps, video only, 20.09MiB
336          webm       2560x1440  1440p HDR 9840k , vp9.2, 24fps, video only, 31.60MiB
313          webm       3840x2160  2160p 12960k , vp9, 24fps, video only, 38.17MiB
337          webm       3840x2160  2160p HDR 22367k , vp9.2, 24fps, video only, 74.53MiB
18           mp4        640x360    medium , avc1.42001E, mp4a.40.2@ 96k, 2.46MiB
43           webm       640x360    medium , vp8.0, vorbis@128k, 2.96MiB
22           mp4        1280x720   hd720 , avc1.64001F, mp4a.40.2@192k (best)

[dstftw]

Invalid syntax: each selector must be in separate brackets, not single brackets separated by ,.