youtube format 22 reporting incorrect audio bitrates

[flatpack]

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Make sure you are using the latest version: run youtube-dl --version and ensure your version is 2016.09.04.1. If it's not read this FAQ entry and update. Issues with outdated version will be rejected.

• I've verified and I assure that I'm running youtube-dl 2016.09.04.1

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• At least skimmed through README and most notably FAQ and BUGS sections
• Searched the bugtracker for similar issues including closed ones

What is the purpose of your issue?

• Bug report (encountered problems with youtube-dl)
• Site support request (request for adding support for a new site)
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If the purpose of this issue is a bug report, site support request or you are not completely sure provide the full verbose output as follows:

Add -v flag to your command line you run youtube-dl with, copy the whole output and insert it here. It should look similar to one below (replace it with your log inserted between triple ```):

$ youtube-dl -v -F _zA1OtsvvC4
[debug] System config: []
[debug] User config: []
[debug] Command-line args: [u'-v', u'-F', u'_zA1OtsvvC4']
[debug] Encodings: locale UTF-8, fs UTF-8, out UTF-8, pref UTF-8
[debug] youtube-dl version 2016.09.04.1
[debug] Python version 2.7.12 - Linux-4.4.0-36-generic-x86_64-with-Ubuntu-16.04-xenial
[debug] exe versions: ffmpeg 2.8.6-1ubuntu2, ffprobe 2.8.6-1ubuntu2, rtmpdump 2.4
[debug] Proxy map: {}
[youtube] _zA1OtsvvC4: Downloading webpage
[youtube] _zA1OtsvvC4: Downloading video info webpage
[youtube] _zA1OtsvvC4: Extracting video information
[youtube] {22} signature length 46.40, html5 player en_US-vflqMMQzs
[youtube] {43} signature length 46.40, html5 player en_US-vflqMMQzs
[youtube] {18} signature length 46.40, html5 player en_US-vflqMMQzs
[youtube] {36} signature length 46.40, html5 player en_US-vflqMMQzs
[youtube] {17} signature length 46.40, html5 player en_US-vflqMMQzs
[youtube] {136} signature length 46.40, html5 player en_US-vflqMMQzs
[youtube] {247} signature length 46.40, html5 player en_US-vflqMMQzs
[youtube] {135} signature length 46.40, html5 player en_US-vflqMMQzs
[youtube] {244} signature length 46.40, html5 player en_US-vflqMMQzs
[youtube] {134} signature length 46.40, html5 player en_US-vflqMMQzs
[youtube] {243} signature length 46.40, html5 player en_US-vflqMMQzs
[youtube] {133} signature length 46.40, html5 player en_US-vflqMMQzs
[youtube] {242} signature length 46.40, html5 player en_US-vflqMMQzs
[youtube] {160} signature length 46.40, html5 player en_US-vflqMMQzs
[youtube] {278} signature length 46.40, html5 player en_US-vflqMMQzs
[youtube] {140} signature length 46.40, html5 player en_US-vflqMMQzs
[youtube] {171} signature length 46.40, html5 player en_US-vflqMMQzs
[youtube] {249} signature length 46.40, html5 player en_US-vflqMMQzs
[youtube] {250} signature length 46.40, html5 player en_US-vflqMMQzs
[youtube] {251} signature length 46.40, html5 player en_US-vflqMMQzs
[info] Available formats for _zA1OtsvvC4:
format code  extension  resolution note
249          webm       audio only DASH audio   51k , opus @ 50k, 1.63MiB
250          webm       audio only DASH audio   68k , opus @ 70k, 2.10MiB
171          webm       audio only DASH audio  128k , vorbis@128k, 4.03MiB
140          m4a        audio only DASH audio  129k , m4a_dash container, mp4a.40.2@128k, 4.28MiB
251          webm       audio only DASH audio  165k , opus @160k, 5.17MiB
278          webm       256x144    144p   42k , webm container, vp9, 15fps, video only, 818.32KiB
242          webm       426x240    240p  106k , vp9, 30fps, video only, 1.66MiB
160          mp4        256x144    144p  122k , avc1.4d400c, 15fps, video only, 2.21MiB
243          webm       640x360    360p  169k , vp9, 30fps, video only, 2.64MiB
134          mp4        640x360    360p  227k , avc1.4d401e, 30fps, video only, 3.73MiB
244          webm       854x480    480p  256k , vp9, 30fps, video only, 3.75MiB
133          mp4        426x240    240p  277k , avc1.4d4015, 30fps, video only, 5.59MiB
247          webm       1280x720   720p  456k , vp9, 30fps, video only, 6.58MiB
135          mp4        854x480    480p  480k , avc1.4d401f, 30fps, video only, 6.13MiB
136          mp4        1280x720   720p  759k , avc1.4d401f, 30fps, video only, 10.09MiB
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)

# Note that the audio bitrate for format 22 is reported as 192k
# I am looking for the best video and audio experience, so format 22 looks like the best choice.
# To check, I request that format, and postprocess it to extract the audio (to analyse later):
$ youtube-dl -x -f 22 _zA1OtsvvC4
[youtube] _zA1OtsvvC4: Downloading webpage
[youtube] _zA1OtsvvC4: Downloading video info webpage
[youtube] _zA1OtsvvC4: Extracting video information
[download] Destination: Billy Joel - My Life (lyrics on screen)-_zA1OtsvvC4.mp4
[download] 100% of 14.27MiB in 00:00
[ffmpeg] Destination: Billy Joel - My Life (lyrics on screen)-_zA1OtsvvC4.m4a
Deleting original file Billy Joel - My Life (lyrics on screen)-_zA1OtsvvC4.mp4 (pass -k to keep)

# Now I check the audio bitrate:
$ ffprobe Billy\ Joel\ -\ My\ Life\ \(lyrics\ on\ screen\)-_zA1OtsvvC4.m4a
ffprobe version 2.8.6-1ubuntu2 Copyright (c) 2007-2016 the FFmpeg developers
  built with gcc 5.3.1 (Ubuntu 5.3.1-11ubuntu1) 20160311
  configuration: --prefix=/usr --extra-version=1ubuntu2 --build-suffix=-ffmpeg --toolchain=hardened --libdir=/usr/lib/x86_64-linux-gnu --incdir=/usr/include/x86_64-linux-gnu --cc=cc --cxx=g++ --enable-gpl --enable-shared --disable-stripping --disable-decoder=libopenjpeg --disable-decoder=libschroedinger --enable-avresample --enable-avisynth --enable-gnutls --enable-ladspa --enable-libass --enable-libbluray --enable-libbs2b --enable-libcaca --enable-libcdio --enable-libflite --enable-libfontconfig --enable-libfreetype --enable-libfribidi --enable-libgme --enable-libgsm --enable-libmodplug --enable-libmp3lame --enable-libopenjpeg --enable-libopus --enable-libpulse --enable-librtmp --enable-libschroedinger --enable-libshine --enable-libsnappy --enable-libsoxr --enable-libspeex --enable-libssh --enable-libtheora --enable-libtwolame --enable-libvorbis --enable-libvpx --enable-libwavpack --enable-libwebp --enable-libx265 --enable-libxvid --enable-libzvbi --enable-openal --enable-opengl --enable-x11grab --enable-libdc1394 --enable-libiec61883 --enable-libzmq --enable-frei0r --enable-libx264 --enable-libopencv
  WARNING: library configuration mismatch
  avcodec     configuration: --prefix=/usr --extra-version=1ubuntu2 --build-suffix=-ffmpeg --toolchain=hardened --libdir=/usr/lib/x86_64-linux-gnu --incdir=/usr/include/x86_64-linux-gnu --cc=cc --cxx=g++ --enable-gpl --enable-shared --disable-stripping --disable-decoder=libopenjpeg --disable-decoder=libschroedinger --enable-avresample --enable-avisynth --enable-gnutls --enable-ladspa --enable-libass --enable-libbluray --enable-libbs2b --enable-libcaca --enable-libcdio --enable-libflite --enable-libfontconfig --enable-libfreetype --enable-libfribidi --enable-libgme --enable-libgsm --enable-libmodplug --enable-libmp3lame --enable-libopenjpeg --enable-libopus --enable-libpulse --enable-librtmp --enable-libschroedinger --enable-libshine --enable-libsnappy --enable-libsoxr --enable-libspeex --enable-libssh --enable-libtheora --enable-libtwolame --enable-libvorbis --enable-libvpx --enable-libwavpack --enable-libwebp --enable-libx265 --enable-libxvid --enable-libzvbi --enable-openal --enable-opengl --enable-x11grab --enable-libdc1394 --enable-libiec61883 --enable-libzmq --enable-frei0r --enable-libx264 --enable-libopencv --enable-version3 --disable-doc --disable-programs --disable-avdevice --disable-avfilter --disable-avformat --disable-avresample --disable-postproc --disable-swscale --enable-libopencore_amrnb --enable-libopencore_amrwb --enable-libvo_aacenc --enable-libvo_amrwbenc
  libavutil      54. 31.100 / 54. 31.100
  libavcodec     56. 60.100 / 56. 60.100
  libavformat    56. 40.101 / 56. 40.101
  libavdevice    56.  4.100 / 56.  4.100
  libavfilter     5. 40.101 /  5. 40.101
  libavresample   2.  1.  0 /  2.  1.  0
  libswscale      3.  1.101 /  3.  1.101
  libswresample   1.  2.101 /  1.  2.101
  libpostproc    53.  3.100 / 53.  3.100
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'Billy Joel - My Life (lyrics on screen)-_zA1OtsvvC4.m4a':
  Metadata:
    major_brand     : M4A 
    minor_version   : 512
    compatible_brands: isomiso2
    encoder         : Lavf56.40.101
  Duration: 00:04:39.62, start: 0.000000, bitrate: 126 kb/s
    Stream #0:0(und): Audio: aac (LC) (mp4a / 0x6134706D), 44100 Hz, stereo, fltp, 125 kb/s (default)
    Metadata:
      handler_name    : SoundHandler

# Note the following lines, suggesting the audio bitrate in the stream (and hence the audio file) is 128k (approx):
  Duration: 00:04:39.62, start: 0.000000, bitrate: 126 kb/s
    Stream #0:0(und): Audio: aac (LC) (mp4a / 0x6134706D), 44100 Hz, stereo, fltp, 125 kb/s (default)

# They do not agree with the output from youtube-dl -F above, which reports it as 192k:
22           mp4        1280x720   hd720 , avc1.64001F,  mp4a.40.2@192k (best)

# This is a relatively recent development; previously the audio in the format 22 mp4 stream was generally 192k, matching what youtube-dl -F said.

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Would it be possible to ensure that the audio bitrate for youtube format 22 is correctly reported? 

[dstftw]

Not possible. There is no bitrate metadata available for non-DASH formats. 192k is a hardcode that has been true previously.