id,summary,reporter,owner,description,type,status,priority,component,version,resolution,keywords,cc,blockedby,blocking,reproduced,analyzed
1027,MP3 muxer should support writing Xing header for all MP3 sample rates.,bat_guano,,"When converting to MPEG-2 layer III and MPEG-2.5 layer III FFmpeg gives error report ""Unsupported sample rate"".
FFmpeg does the conversion OK but it reports ""Unsupported sample rate"". 
I've discussed this on the FFmpeg-users mailing list.
Here:- http://ffmpeg-users.933282.n4.nabble.com/When-encoding-mp3-at-low-bitrate-FFmpeg-gives-error-report-td4410167.html

****************************
ffmpeg -i foo.flac -c:a libmp3lame -b:a 16k -ar 22050 -ac 1 foo.mp3
ffmpeg version N-37961-gf649247 Copyright (c) 2000-2012 the FFmpeg developers
  built on Feb 18 2012 00:14:51 with gcc 4.5.2
  configuration: --enable-gpl --enable-version3 --enable-nonfree --enable-postproc --enable-libfaac --enable-libmp3lame --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libtheora --enable-libvorbis --enable-libvpx --enable-libx264 --enable-libxvid --enable-x11grab --disable-encoder=vorbis --enable-libvo-amrwbenc --enable-libvo-aacenc --enable-libspeex
  libavutil      51. 39.100 / 51. 39.100
  libavcodec     54.  3.100 / 54.  3.100
  libavformat    54.  1.100 / 54.  1.100
  libavdevice    53.  4.100 / 53.  4.100
  libavfilter     2. 62.101 /  2. 62.101
  libswscale      2.  1.100 /  2.  1.100
  libswresample   0.  6.100 /  0.  6.100
  libpostproc    52.  0.100 / 52.  0.100
[flac @ 0x9723ac0] max_analyze_duration 5000000 reached at 5015510
[flac @ 0x9723ac0] Estimating duration from bitrate, this may be inaccurate
Input #0, flac, from 'foo.flac':
  Duration: N/A, bitrate: N/A
    Stream #0:0: Audio: flac, 44100 Hz, stereo, s16
[mp3 @ 0x9777d40] Unsupported sample rate.
Output #0, mp3, to 'foo.mp3':
  Metadata:
    TSSE            : Lavf54.1.100
    Stream #0:0: Audio: mp3, 22050 Hz, 1 channels, s16, 16 kb/s
Stream mapping:
  Stream #0:0 -> #0:0 (flac -> libmp3lame)
Press [q] to stop, [?] for help
size=     201kB time=00:01:42.81 bitrate=  16.0kbits/s   
video:0kB audio:201kB global headers:0kB muxing overhead 0.016534% 

",enhancement,closed,minor,avformat,git-master,fixed,libmp3 xing,,,,0,0