[FFmpeg-trac] #431(undetermined:closed): 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:  closed
             Priority:  normal       |                Component:
              Version:  git-master   |  undetermined
             Keywords:  CBR mp3      |               Resolution:  fixed
             Blocking:               |               Blocked By:
Analyzed by developer:  0            |  Reproduced by developer:  0
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Comment (by edumj):

 Sorry for reopening this ticket again, but it seems that this was never
 really fixed.

 Every time a open with VirtualDub an AVI made with '''ffmpeg''' (no matter
 the version), it warns about "'''Variable Bitrate (VBR) audio
 detected'''". But it's ok with AVIs made with Mencoder!

 Now I'm trying to analyze some AVIs to find differences with AVIs made
 with '''mpeg4 native encoder''' and '''libxvid''' (because '''mpeg4'''
 doesn't make really '''compliant XviD''' files for some reason or default
 option...) and I just found a program called '''AVInaptic.
 '''
 And with '''AVInaptic''' I found a big difference:
 AVIs made with '''ffmpeg''', appart from the field "'''Bitrate (bs)'''"
 which says "''128 kbps CBR''" (that should be the field also reads
 MediaInfo) have an extra field called just "'''Bitrate'''" which says
 "''128 kbps '''VBR'''''" and that should be what VirtualDub reads, and may
 be what causes problems in some DVD Players??

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Ticket URL: <https://trac.ffmpeg.org/ticket/431#comment:22>
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