[FFmpeg-trac] #431(undetermined:open): When converting audio to an MP3 using CBR, result is reported VBR

[FFmpeg]

#431: When converting audio to an MP3 using CBR, result is reported VBR
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             Reporter:  schtorch     |                    Owner:  michael
                 Type:  defect       |                   Status:  open
             Priority:  normal       |                Component:
              Version:  git-master   |  undetermined
             Keywords:  CBR          |               Resolution:
             Blocking:               |               Blocked By:
Analyzed by developer:  0            |  Reproduced by developer:  0
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Comment (by schtorch):

 I see the problem that the bitrate and bit rate mode is reported wrong in
 a lot of players (e.g. VLC states 56k for a 128k CBR without initial Xing
 header). This might be at first sight a more cosmetic issue but confuses
 people when they want to verify if it's a CBR or what bitrate the file
 exactly has without using a calculator and the file size.

 The reason to verify if it's a CBR are compatibility problems with players
 that do not support MP3 VBR, eg. some mobiles or software in older
 hardware. Maybe (just guessing) there is also a problem that players that
 only support CBR do not play files "marked as VBR" that are in reality CBR
 files.

 I would really appreciate a fix.

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Ticket URL: <https://avcodec.org/trac/ffmpeg/ticket/431#comment:10>
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