4K chosen instead of 8K video

[aghtragh]

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Isn't youtube-dl supposed to, by default, download the best quality available?
If I run this command:

youtube-dl https://www.youtube.com/watch?v=M3btuZ_KuPU

youtube-dl downloads 4K (format code 313) video instead of the maximum quality of 8K (format code 272). Isn't the 8K video higher quality?

[youtube] M3btuZ_KuPU: Downloading webpage
[youtube] M3btuZ_KuPU: Downloading video info webpage
[info] Available formats for M3btuZ_KuPU:
format code  extension  resolution note
249          webm       audio only DASH audio   58k , opus @ 50k, 1.30MiB
250          webm       audio only DASH audio   85k , opus @ 70k, 1.81MiB
171          webm       audio only DASH audio   99k , vorbis@128k, 2.11MiB
140          m4a        audio only DASH audio  128k , m4a_dash container, mp4a.40.2@128k, 3.13MiB
251          webm       audio only DASH audio  161k , opus @160k, 3.59MiB
278          webm       256x144    144p  109k , webm container, vp9, 30fps, video only, 1.60MiB
160          mp4        256x144    144p  122k , avc1.4d400c, 30fps, video only, 2.21MiB
242          webm       426x240    240p  244k , vp9, 30fps, video only, 3.16MiB
133          mp4        426x240    240p  262k , avc1.4d4015, 30fps, video only, 4.91MiB
243          webm       640x360    360p  453k , vp9, 30fps, video only, 6.04MiB
134          mp4        640x360    360p  485k , avc1.4d401e, 30fps, video only, 6.59MiB
244          webm       854x480    480p  822k , vp9, 30fps, video only, 10.96MiB
135          mp4        854x480    480p 1014k , avc1.4d401f, 30fps, video only, 12.73MiB
247          webm       1280x720   720p 1686k , vp9, 30fps, video only, 22.08MiB
136          mp4        1280x720   720p 1831k , avc1.4d401f, 30fps, video only, 22.90MiB
248          webm       1920x1080  1080p 3002k , vp9, 30fps, video only, 38.78MiB
137          mp4        1920x1080  1080p 3165k , avc1.640028, 30fps, video only, 41.34MiB
271          webm       2560x1440  1440p 8551k , vp9, 30fps, video only, 104.23MiB
272          webm       7680x4320  4320p 14812k , vp9, 30fps, video only, 198.76MiB
313          webm       3840x2160  2160p 18369k , vp9, 30fps, video only, 234.99MiB
17           3gp        176x144    small , mp4v.20.3, mp4a.40.2@ 24k, 1.49MiB
36           3gp        320x180    small , mp4v.20.3, mp4a.40.2, 4.18MiB
18           mp4        640x360    medium , avc1.42001E, mp4a.40.2@ 96k, 12.96MiB
43           webm       640x360    medium , vp8.0, vorbis@128k, 13.80MiB
22           mp4        1280x720   hd720 , avc1.64001F, mp4a.40.2@192k (best)

[Hrxn]

272 webm 7680x4320 4320p 14812k , vp9, 30fps, video only, 198.76MiB
313 webm 3840x2160 2160p 18369k , vp9, 30fps, video only, 234.99MiB

Can you confirm that these are indeed the correct sizes (or bitrates) for the video stream?
Because the 4K stream has a higher bitrate and size, which does not really make sense, but would explain the selection by youtube-dl.

[dstftw]

Bitrate is preferred over height. This is expected behavior for now.

[sidvud98]

@aghtragh how are you ablto download in 4k. I am only getting 720p.