[FFmpeg-trac] #431(undetermined:closed): When converting audio to an MP3 using CBR, result is reported VBR
FFmpeg
trac at avcodec.org
Mon Apr 10 03:17:07 EEST 2017
#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??
--
Ticket URL: <https://trac.ffmpeg.org/ticket/431#comment:22>
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