diff --git a/trunk/conf/srs.conf b/trunk/conf/srs.conf
index 3d2182161..08d21ca5c 100755
--- a/trunk/conf/srs.conf
+++ b/trunk/conf/srs.conf
@@ -238,7 +238,7 @@ vhost crop.transcode.vhost.com {
         }
     }
 }
-# the logo filter of ffmpeg, @see: http://ffmpeg.org/ffmpeg-filters.html#crop
+# the logo filter of ffmpeg, @see: http://ffmpeg.org/ffmpeg-filters.html#overlay
 vhost logo.transcode.vhost.com {
     transcode {
         enabled     on;
@@ -246,7 +246,8 @@ vhost logo.transcode.vhost.com {
         engine logo {
             enabled         on;
             vfilter {
-                vf                  'crop=200:100:10:10';
+                i               ./doc/ffmpeg-logo.png;
+                filter_complex      'overlay=10:10';
             }
             vcodec          libx264;
             vbitrate        300;
diff --git a/trunk/configure b/trunk/configure
index cc2522d82..3a74e4844 100755
--- a/trunk/configure
+++ b/trunk/configure
@@ -162,6 +162,12 @@ BUILD_KEY="bandwidth" APP_MAIN="srs_main_bandcheck" APP_NAME="bandwidth" SO_PATH
 
 echo 'configure ok! '
 
+#####################################################################################
+# when configure success, prepare build
+#####################################################################################
+# create objs/logs for ffmpeg to write log.
+mkdir -p ${SRS_OBJS}/logs
+
 #####################################################################################
 # configure summary
 #####################################################################################