Downloaded YouTube video doesn't match advertised bitrate

[Hawpe]

Checklist

• I'm reporting a broken site support
• I've verified that I'm running youtube-dl version 2020.05.08
• 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 issues including closed ones

Verbose log

$ youtube-dl -F https://youtu.be/A7p4pJ_mPe8
[youtube] A7p4pJ_mPe8: Downloading webpage
[info] Available formats for A7p4pJ_mPe8:
format code  extension  resolution note
249          webm       audio only tiny   57k , opus @ 50k (48000Hz), 5.63MiB
250          webm       audio only tiny   77k , opus @ 70k (48000Hz), 7.47MiB
140          m4a        audio only tiny  131k , m4a_dash container, mp4a.40.2@128k (44100Hz), 16.14MiB
251          webm       audio only tiny  162k , opus @160k (48000Hz), 15.25MiB
278          webm       256x144    144p   97k , webm container, vp9, 30fps, video only, 11.78MiB
160          mp4        256x144    144p  112k , avc1.4d400c, 30fps, video only, 10.85MiB
242          webm       426x240    240p  223k , vp9, 30fps, video only, 24.59MiB
133          mp4        426x240    240p  302k , avc1.4d4015, 30fps, video only, 24.44MiB
243          webm       640x360    360p  412k , vp9, 30fps, video only, 46.04MiB
134          mp4        640x360    360p  619k , avc1.4d401e, 30fps, video only, 50.45MiB
244          webm       854x480    480p  759k , vp9, 30fps, video only, 76.00MiB
135          mp4        854x480    480p  904k , avc1.4d401f, 30fps, video only, 78.75MiB
247          webm       1280x720   720p 1515k , vp9, 30fps, video only, 136.40MiB
136          mp4        1280x720   720p 1535k , avc1.4d401f, 30fps, video only, 113.41MiB
248          webm       1920x1080  1080p 2670k , vp9, 30fps, video only, 320.56MiB
137          mp4        1920x1080  1080p 4503k , avc1.640028, 30fps, video only, 400.26MiB
18           mp4        640x360    360p  726k , avc1.42001E, 30fps, mp4a.40.2@ 96k (44100Hz), 90.55MiB
22           mp4        1280x720   720p 1038k , avc1.64001F, 30fps, mp4a.40.2@192k (44100Hz) (best)

youtube-dl -v https://youtu.be/A7p4pJ_mPe8
[debug] System config: []
[debug] User config: []
[debug] Custom config: []
[debug] Command-line args: [u'-v', u'https://youtu.be/A7p4pJ_mPe8']
[debug] Encodings: locale UTF-8, fs UTF-8, out UTF-8, pref UTF-8
[debug] youtube-dl version 2020.05.08
[debug] Python version 2.7.15+ (CPython) - Linux-4.4.0-18362-Microsoft-x86_64-with-Ubuntu-18.04-bionic
[debug] exe versions: ffmpeg 3.4.6, ffprobe 3.4.6, phantomjs 2.1.1, rtmpdump 2.4
[debug] Proxy map: {}
[youtube] A7p4pJ_mPe8: Downloading webpage
[debug] Default format spec: bestvideo+bestaudio/best
WARNING: Requested formats are incompatible for merge and will be merged into mkv.
[debug] Invoking downloader on u'https://r4---sn-4gxx-hgnz.googlevideo.com/videoplayback?expire=1589724260&ei=BPDAXo6dDdfH1wbRt7yQBQ&ip=37.166.220.250&id=o-AJp54YGoR_Xjnx1i_DMa6Kou_QiIqdvpIoR7zYN0JSbK&itag=137&aitags=133%2C134%2C135%2C136%2C137%2C160%2C242%2C243%2C244%2C247%2C248%2C278&source=youtube&requiressl=yes&mh=7M&mm=31%2C29&mn=sn-4gxx-hgnz%2Csn-25ge7nsd&ms=au%2Crdu&mv=m&mvi=3&pl=14&initcwndbps=585000&vprv=1&mime=video%2Fmp4&gir=yes&clen=419700809&dur=1045.844&lmt=1586623707739236&mt=1589702615&fvip=4&keepalive=yes&fexp=23882514&c=WEB&txp=5535432&sparams=expire%2Cei%2Cip%2Cid%2Caitags%2Csource%2Crequiressl%2Cvprv%2Cmime%2Cgir%2Cclen%2Cdur%2Clmt&sig=AOq0QJ8wRAIgQIT8ZiSC1n_AljBuV2m_dwyoQcSBqx_aAQNfFbT95IACIBY8T0-W1g01YBmt_3kXmWPR0qnTOOnJbOZs2-xuNmh4&lsparams=mh%2Cmm%2Cmn%2Cms%2Cmv%2Cmvi%2Cpl%2Cinitcwndbps&lsig=AG3C_xAwRQIgOEO4FAFaoBRPNMtgHV0xM3BFT0oZQjWwUY-avtg-ddsCIQCuyIbP_FBu3PhfiMB6f96atRSZB2Fcg0JOpxAOwUhgyA%3D%3D&ratebypass=yes'
[download] Destination: ASMR From My Backyard 🌞 (Relaxing Personal Attention)-A7p4pJ_mPe8.f137.mp4
[download] 100% of 400.26MiB in 00:45
[debug] Invoking downloader on u'https://r4---sn-4gxx-hgnz.googlevideo.com/videoplayback?expire=1589724260&ei=BPDAXo6dDdfH1wbRt7yQBQ&ip=37.166.220.250&id=o-AJp54YGoR_Xjnx1i_DMa6Kou_QiIqdvpIoR7zYN0JSbK&itag=251&source=youtube&requiressl=yes&mh=7M&mm=31%2C29&mn=sn-4gxx-hgnz%2Csn-25ge7nsd&ms=au%2Crdu&mv=m&mvi=3&pl=14&initcwndbps=585000&vprv=1&mime=audio%2Fwebm&gir=yes&clen=15995764&dur=1045.881&lmt=1586560166892588&mt=1589702615&fvip=4&keepalive=yes&fexp=23882514&c=WEB&txp=5511222&sparams=expire%2Cei%2Cip%2Cid%2Citag%2Csource%2Crequiressl%2Cvprv%2Cmime%2Cgir%2Cclen%2Cdur%2Clmt&sig=AOq0QJ8wRQIhAO31tS4Gp7tKG5AN_CBQQTRZJtThy623dzV2TDQ3U_z1AiBB3K4fOIt2Jo5oZzLpBK5fXhsx_XXsf2ENiH1XjaVlRA%3D%3D&lsparams=mh%2Cmm%2Cmn%2Cms%2Cmv%2Cmvi%2Cpl%2Cinitcwndbps&lsig=AG3C_xAwRQIgOEO4FAFaoBRPNMtgHV0xM3BFT0oZQjWwUY-avtg-ddsCIQCuyIbP_FBu3PhfiMB6f96atRSZB2Fcg0JOpxAOwUhgyA%3D%3D&ratebypass=yes'
[download] Destination: ASMR From My Backyard 🌞 (Relaxing Personal Attention)-A7p4pJ_mPe8.f251.webm
[download] 100% of 15.25MiB in 00:02
[ffmpeg] Merging formats into "ASMR From My Backyard 🌞 (Relaxing Personal Attention)-A7p4pJ_mPe8.mkv"
[debug] ffmpeg command line: ffmpeg -y -loglevel 'repeat+info' -i 'file:ASMR From My Backyard 🌞 (Relaxing Personal Attention)-A7p4pJ_mPe8.f137.mp4' -i 'file:ASMR From My Backyard 🌞 (Relaxing Personal Attention)-A7p4pJ_mPe8.f251.webm' -c copy -map '0:v:0' -map '1:a:0' 'file:ASMR From My Backyard 🌞 (Relaxing Personal Attention)-A7p4pJ_mPe8.temp.mkv'
Deleting original file ASMR From My Backyard 🌞 (Relaxing Personal Attention)-A7p4pJ_mPe8.f137.mp4 (pass -k to keep)
Deleting original file ASMR From My Backyard 🌞 (Relaxing Personal Attention)-A7p4pJ_mPe8.f251.webm (pass -k to keep)

ffprobe on video from a month ago

Input #0, matroska,webm, from 'ASMR From My Backyard (Relaxing Personal Attention).mkv':
  Metadata:
    COMPATIBLE_BRANDS: iso6avc1mp41
    MAJOR_BRAND     : dash
    MINOR_VERSION   : 0
    ENCODER         : Lavf57.83.100
  Duration: 00:17:25.86, start: -0.007000, bitrate: 4320 kb/s

ffprobe on video downloaded today

Input #0, matroska,webm, from 'ASMR From My Backyard 🌞 (Relaxing Personal Attention)-A7p4pJ_mPe8.mkv':
  Metadata:
    COMPATIBLE_BRANDS: iso6avc1mp41
    MAJOR_BRAND     : dash
    MINOR_VERSION   : 0
    ENCODER         : Lavf57.83.100
  Duration: 00:17:25.88, start: -0.007000, bitrate: 3331 kb/s

Description

Downloading the highest quality available results in a lower bitrate than the one given in the formats list. Expected bitrate is around 4500k, actual bitrate is 3300k. The same video downloaded a month ago has the correct bitrate.

I am aware of issue #15180, though it is closed and is 2 years old, and since I managed to get the correct bitrate video a month ago I figured it might be a different problem.
Downloading the webm version as proposed would not work as the highest bitrate is the f137 one. Is there any other workaround?

[dstftw]

Blame Youtube for reporting incorrect bitrate.

[Hawpe]

This is not an incorrect bitrate, a month ago the download had the indicated bitrate - which I put in the issue.

[Hawpe]

@dstftw did you even read the end of the issue?