1536 for DVD, but commonly used values range from 192 kbps for stereo to 384 kbps for 5.1 channel sound... d:
<code>-oac lavc -lavcopts acodec=ac3:abitrate=192</code>
For DVD with 5.1 channel sound:
<code>-c... te=5000:\
keyint=15:vstrict=0:acodec=ac3:abitrate=192:aspect=16/9 -ofps 25 \
-o movie.mpg movie.avi</... te=5000:\
keyint=18:vstrict=0:acodec=ac3:abitrate=192:aspect=16/9 -ofps 30000/1001 \
-o movie.mpg mov