Be aware that the ID3 tag is currently lost when transcoding. # lame -preset cbr 128k test_orig.mp3 test_lame_cbr.mp3 Here is a comment I found on the ffmpeg user mailinglist:Īnother info, I tried to use lame directly and mediainfo reports a correct bit rate mode. Video:0kB audio:3307kB global headers:0kB muxing overhead 0.005581% Output #0, mp3, to 'test_ffmpeg_cbr.mp3':

Stream #0.0: Audio: mp3, 44100 Hz, stereo, s16, 128 kb/sįile 'test_ffmpeg_cbr.mp3' already exists. When I try to convert a file to MP3 with CBR using the latest GIT, I get a file which is reported by various players (mediainfo, VLC) to be a variable bitrate (VBR) file.įfmpeg -i test_orig.mp3 -ab 128k test_ffmpeg_cbr.mp3įfmpeg version N-32327-g27bf599, Copyright (c) 2000-2011 the FFmpeg developersīuilt on 21:57:49 with gcc 4.5.1 20101208 Ĭonfiguration: -shlibdir=/usr/lib64 -prefix=/usr -mandir=/usr/share/man -libdir=/usr/lib64 -enable-shared -enable-libmp3lame -enable-libvorbis -enable-libtheora -enable-libspeex -enable-libxvid -enable-postproc -enable-gpl -disable-network -extra-cflags='-fmessage-length=0 -O2 -Wall -D_FORTIFY_SOURCE=2 -fstack-protector -funwind-tables -fasynchronous-unwind-tables -fPIC -I/usr/include/gsm' -disable-stripping -enable-libschroedinger -enable-libdirac -enable-libgsm -enable-avfilter -enable-libvpx -enable-version3 -enable-libopencore-amrnb -enable-libopencore-amrwb -enable-libx264 -enable-pthreads -enable-libfaac -enable-nonfree -disable-doc -disable-ffplay -disable-ffserver

Mp3 variable to fixed bitrate converter