FFMPEG: Se pierde el audio al convertirse a FLV

[AdRiAnCeTe]

Código:

[root@server49 /]# /usr/local/bin/ffmpeg -y -i /mnt/videos/29.avi -acodec mp3 -ar 22050 -f flv /mnt/flvideos/29.flv
FFmpeg version SVN-r9494, Copyright (c) 2000-2007 Fabrice Bellard, et al.
  configuration: --enable-shared
  libavutil version: 49.4.1
  libavcodec version: 51.40.4
  libavformat version: 51.12.1
  built on Jul  6 2007 19:37:46, gcc: 3.4.6 20060404 (Red Hat 3.4.6-8)
Input #0, avi, from '/mnt/videos/29.avi':
  Duration: 00:00:14.3, start: 0.000000, bitrate: 330 kb/s
  Stream #0.0: Video: mpeg4, yuv420p, 320x240, 10.00 fps(r)
  Stream #0.1: Audio: mp2, 22050 Hz, mono, 64 kb/s
Output #0, flv, to '/mnt/flvideos/29.flv':
  Stream #0.0: Video: flv, yuv420p, 320x240, q=2-31, 200 kb/s, 10.00 fps(c)
  Stream #0.1: Audio: 0x0000, 22050 Hz, mono, 64 kb/s
Stream mapping:
  Stream #0.0 -> #0.0
  Stream #0.1 -> #0.1
Unsupported codec for output stream #0.1

Este error me da pasandole este comando:

Código:

/usr/local/bin/ffmpeg -y -i /mnt/videos/29.avi -acodec mp3 -ar 22050 -f flv /mnt/flvideos/29.flv