Stefan Fiedler via Rene Rebe:

package/rene/ffmpeg/ffmpeg.conf

@@ -20,5 +20,11 @@
 # 
 # --- ROCK-COPYRIGHT-NOTE-END ---
 
+# fill options the configure does not attempt to detect ...
+pkginstalled lame && var_append extraconfopt " " "--enable-mp3lame"
+pkginstalled ogg-vorbis && var_append extraconfopt " " "--enable-vorbis" 
+pkginstalled a52dec && var_append extraconfopt " " "--enable-a52"
+
+# MMX optimizations currently don't compile (version 0.4.8)
 var_append confopt " " "--disable-mmx --enable-shared --enable-pp"