trying to fix qscale==0

Originally committed as revision 341 to svn://svn.ffmpeg.org/ffmpeg/trunk

ffserver.c

@@ -1179,6 +1179,13 @@ void add_codec(FFStream *stream, AVCodecContext *av)
             av->width = 160;
             av->height = 128;
         }
+        av->bit_rate_tolerance= 128000;
+        av->qmin= 5;
+        av->qmax= 31;
+        av->qcompress= 0.5;
+        av->qblur= 0.5;
+        av->max_qdiff= 3;
+
         break;
     }