Opened 19 months ago
Closed 18 months ago
#6549 closed defect (invalid)
low bitrate mp3 encoding result in vbr instead of cbr
Reported by: | mboe78 | Owned by: | |
---|---|---|---|
Priority: | normal | Component: | undetermined |
Version: | git-master | Keywords: | libmp3lame |
Cc: | Blocked By: | ||
Blocking: | Reproduced by developer: | no | |
Analyzed by developer: | no |
Description
Summary of the bug:
Regarding to Bug #431 encoding of low bitrate mp3 using ffmpeg results in VBR and not in CBR. Everything encoded lower than 64kbit is affected. Everything higher 64kbit will result in CBR.
How to reproduce:
ffmpeg -i "$infile" -vn -acodec libmp3lame -ac 1 -b:a 32k recode.mp3
mediainfo recode.mp3 General Complete name : recode.mp3 Format : MPEG Audio File size : 114 KiB Overall bit rate mode : Variable Album : XXXXX Part/Position : 01 Part/Total : 01 Track name : XXXX Track name/Position : 01 Track name/Total : 01 Performer : XXXX Recorded date : UTC 2017-07-24 00:00:00.0 Writing library : Lavf56.40.101 ISRC : GBUM71605388 Audio Format : MPEG Audio Format version : Version 1 Format profile : Layer 3 Bit rate mode : Variable Channel(s) : 1 channel Sampling rate : 32.0 kHz Compression mode : Lossy Stream size : 113 KiB (100%)
versions affected:
3.1.4
3.3.2
git-snapshot (2017/07/21)
Change History (2)
comment:1 Changed 19 months ago by mboe78
comment:2 Changed 18 months ago by cehoyos
- Component changed from ffmpeg to undetermined
- Keywords CBR mp3 removed
- Resolution set to invalid
- Status changed from new to closed
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Workaround found
Adding "-write_xing 0" solved the problem.