[FFmpeg-trac] #8763(undetermined:new): ffmpeg doesn't output lame vbr header correctly

[FFmpeg]

#8763: ffmpeg doesn't output lame vbr header correctly
-------------------------------------+-------------------------------------
             Reporter:  spotter      |                    Owner:
                 Type:  defect       |                   Status:  new
             Priority:  normal       |                Component:
                                     |  undetermined
              Version:  unspecified  |               Resolution:
             Keywords:               |               Blocked By:
             Blocking:               |  Reproduced by developer:  0
Analyzed by developer:  0            |
-------------------------------------+-------------------------------------

Comment (by spotter):

 {{{
 ./ffmpeg -i input.flac -codec:a libmp3lame -q:a 0 /tmp/test2.mp3
 ffmpeg version N-98341-gcca982ee01 Copyright (c) 2000-2020 the FFmpeg
 developers
   built with gcc 9 (Ubuntu 9.3.0-10ubuntu2)
   configuration: --enable-libmp3lame --enable-encoder=mp3
   libavutil      56. 55.100 / 56. 55.100
   libavcodec     58. 93.100 / 58. 93.100
   libavformat    58. 47.100 / 58. 47.100
   libavdevice    58. 11.100 / 58. 11.100
   libavfilter     7. 86.100 /  7. 86.100
   libswscale      5.  8.100 /  5.  8.100
   libswresample   3.  8.100 /  3.  8.100
 Input #0, flac, from 'input.flac':
   Metadata:
     disc            : 1
     TOTALDISCS      : 2
     TOTALTRACKS     : 18
   Duration: 00:03:56.29, start: 0.000000, bitrate: 977 kb/s
     Stream #0:0: Audio: flac, 44100 Hz, stereo, s16
 File '/tmp/test2.mp3' already exists. Overwrite? [y/N] y
 Stream mapping:
   Stream #0:0 -> #0:0 (flac (native) -> mp3 (libmp3lame))
 Press [q] to stop, [?] for help
 Output #0, mp3, to '/tmp/test2.mp3':
   Metadata:
     TPOS            : 1
     TOTALDISCS      : 2
     TOTALTRACKS     : 18
     TSSE            : Lavf58.47.100
     Stream #0:0: Audio: mp3 (libmp3lame), 44100 Hz, stereo, s16p
     Metadata:
       encoder         : Lavc58.93.100 libmp3lame
 size=    8084kB time=00:03:56.30 bitrate= 280.3kbits/s speed=41.6x
 video:0kB audio:8084kB subtitle:0kB other streams:0kB global headers:0kB
 muxing overhead: 0.005883%

 }}}

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Ticket URL: <https://trac.ffmpeg.org/ticket/8763#comment:3>
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