[FFmpeg-user] MP3 enconding bitrate

[Paulo Fidalgo]

Hi!

I have trouble to get the mp3 encoded right to play on my Volvo 
Infotainment System (Sensus 3.0), so I have contacted the costumer 
support, and they told me that the files are being encoding with frames 
with more than 320Kbps of bitrate.

Since I don't have a tool to debug it, I've tried to see in codec 
statistics in VLC, which for the files I'm showing as example I've seen 
380Kbps near 3:31 mins.

I believe it's a bug on ffmpeg, although I'm not sure, so I'm asking for 
advice here, since encoding with the lame it works like a charm.

I've encoded with this command:

ffmpeg -i 2L38_01_96kHz.flac -codec:a libmp3lame -qscale:a 0 
2L38_01_96kHz.mp3

The file used is from here:
http://www.lindberg.no/hires/test/2L38_01_96kHz.flac

and the mp3 encoded is here:
http://www.datafilehost.com/d/42cf1c8e

and I'm using ffmpeg from rpm-fusion in Fedora 20:

ffmpeg version 2.1.5 Copyright (c) 2000-2014 the FFmpeg developers
   built on Jul  8 2014 20:44:17 with gcc 4.8.3 (GCC) 20140624 (Red Hat 
4.8.3-1)
   configuration: --prefix=/usr --bindir=/usr/bin 
--datadir=/usr/share/ffmpeg --incdir=/usr/include/ffmpeg 
--libdir=/usr/lib64 --mandir=/usr/share/man --arch=x86_64 
--optflags='-O2 -g -pipe -Wall -Wp,-D_FORTIFY_SOURCE=2 -fexceptions 
-fstack-protector-strong --param=ssp-buffer-size=4 -grecord-gcc-switches 
-m64 -mtune=generic' --enable-bzlib --disable-crystalhd --enable-frei0r 
--enable-gnutls --enable-libass --enable-libcdio --enable-libcelt 
--enable-libdc1394 --disable-indev=jack --enable-libfreetype 
--enable-libgsm --enable-libmp3lame --enable-openal --enable-libopencv 
--enable-libopenjpeg --enable-libopus --enable-libpulse 
--enable-libschroedinger --enable-libsoxr --enable-libspeex 
--enable-libtheora --enable-libvorbis --enable-libv4l2 --enable-libvpx 
--enable-libx264 --enable-libxvid --enable-x11grab --enable-avfilter 
--enable-avresample --enable-postproc --enable-pthreads --disable-static 
--enable-shared --enable-gpl --disable-debug --disable-stripping 
--shlibdir=/usr/lib64 --enable-runtime-cpudetect
   libavutil      52. 48.101 / 52. 48.101
   libavcodec     55. 39.101 / 55. 39.101
   libavformat    55. 19.104 / 55. 19.104
   libavdevice    55.  5.100 / 55.  5.100
   libavfilter     3. 90.100 /  3. 90.100
   libavresample   1.  1.  0 /  1.  1.  0
   libswscale      2.  5.101 /  2.  5.101
   libswresample   0. 17.104 /  0. 17.104
   libpostproc    52.  3.100 / 52.  3.100
Hyper fast Audio and Video encoder