ffmpeg -i output.ogv  -vcodec copy  -i freebsd-3-en-installing-gui-gnome-noise-free.wav -acodec vorbis -ab 128k -strict experimental out2.ogv
ffmpeg version 0.7.12, Copyright (c) 2000-2011 the FFmpeg developers
  built on Apr 11 2012 07:40:07 with gcc 4.4.5
  configuration: --enable-libdc1394 --prefix=/usr --extra-cflags='-Wall -g ' --cc='ccache cc' --enable-shared --enable-libmp3lame --enable-gpl --enable-libvorbis --enable-pthreads --enable-libfaac --enable-libxvid --enable-postproc --enable-x11grab --enable-libgsm --enable-libtheora --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libx264 --enable-libspeex --enable-nonfree --disable-stripping --enable-avfilter --enable-libdirac --disable-decoder=libdirac --enable-libfreetype --enable-libschroedinger --disable-encoder=libschroedinger --enable-version3 --enable-libopenjpeg --enable-libvpx --enable-librtmp --extra-libs=-lgcrypt --disable-altivec --disable-armv5te --disable-armv6 --disable-vis
  libavutil    50. 43. 0 / 50. 43. 0
  libavcodec   52.123. 0 / 52.123. 0
  libavformat  52.111. 0 / 52.111. 0
  libavdevice  52.  5. 0 / 52.  5. 0
  libavfilter   1. 80. 0 /  1. 80. 0
  libswscale    0. 14. 1 /  0. 14. 1
  libpostproc  51.  2. 0 / 51.  2. 0
Input #0, ogg, from 'output.ogv':
  Duration: 00:13:28.23, start: 0.000000, bitrate: 423 kb/s
    Stream #0.0: Video: theora, yuv420p, 1354x768 [PAR 1:1 DAR 677:384], 17 tbr, 17 tbn, 17 tbc
[wav @ 0xf2a380] max_analyze_duration 5000000 reached at 5015510
Input #1, wav, from 'freebsd-3-en-installing-gui-gnome-noise-free.wav':
  Duration: 00:13:29.36, bitrate: 1411 kb/s
    Stream #1.0: Audio: pcm_s16le, 44100 Hz, 2 channels, s16, 1411 kb/s
File 'out2.ogv' already exists. Overwrite ? [y/N] y
Output #0, ogg, to 'out2.ogv':
  Metadata:
    encoder         : Lavf52.111.0
    Stream #0.0: Video: libtheora, yuv420p, 1354x768 [PAR 1:1 DAR 677:384], q=2-31, 17 tbn, 17 tbc
    Stream #0.1: Audio: libvorbis, 44100 Hz, 2 channels, s16, 128 kb/s
Stream mapping:
  Stream #0.0 -> #0.0
  Stream #1.0 -> #0.1
Press [q] to stop, [?] for help
frame= 6230 fps=1616 q=-1.0 Lsize=   43535kB time=00:13:29.37 bitrate= 440.6kbits/s
video:41540kB audio:1751kB global headers:3kB muxing overhead 0.557646%