use aac encoder(libvo_aacenc) available in ubuntu 12.04 universe (libavcodec-extra-53)

vm/build.sh

@@ -42,7 +42,8 @@ sudo  vmbuilder vbox ubuntu --suite=precise \
     --addpkg gstreamer0.10-plugins-good \
     --addpkg gstreamer0.10-plugins-bad \
     --addpkg oxframe \
-    --addpkg ffmpeg \
+    --addpkg libavcodec-extra-53 \
+    --addpkg libav-tools \
     --addpkg ffmpeg2theora \
     --execscript=$base/install.sh \
     --firstboot=$base/firstboot.sh

vm/firstboot.sh

@@ -4,12 +4,6 @@ apt-get -y install ipython ntp
 
 add-apt-repository ppa:j/pandora
 
-#ffmpeg installed as apt package
-#wget http://firefogg.org/nightly/ffmpeg.linux -O /usr/local/bin/ffmpeg
-#chmod 755 /usr/local/bin/ffmpeg
-#wget http://firefogg.org/nightly/ffmpeg2theora.linux -O /usr/local/bin/ffmpeg2theora
-#chmod 755 /usr/local/bin/ffmpeg2theora
-
 #postgresql
 apt-get -y install postgresql postgresql-contrib
 sudo -u postgres createuser -S -D -R pandora