diff --git a/README.md b/README.md
index 6b1066614..9bc0a0ef4 100755
--- a/README.md
+++ b/README.md
@@ -228,6 +228,7 @@ Supported operating systems and hardware:
 * 2013-10-17, Created.<br/>
 
 ## History
+* v1.0, 2014-05-25, fix [#89](https://github.com/winlinvip/simple-rtmp-server/issues/89), config to /dev/null to disable ffmpeg log. 0.9.117
 * v1.0, 2014-05-25, fix [#76](https://github.com/winlinvip/simple-rtmp-server/issues/76), allow edge vhost to add or remove. 0.9.114
 * v1.0, 2014-05-24, Johnny contribute [ossrs.net](http://ossrs.net). karthikeyan start to translate wiki to English.
 * v1.0, 2014-05-22, fix [#78](https://github.com/winlinvip/simple-rtmp-server/issues/78), st joinable thread must be stop by other threads, 0.9.113
diff --git a/trunk/conf/full.conf b/trunk/conf/full.conf
index cb24ec97a..43f32c5e1 100644
--- a/trunk/conf/full.conf
+++ b/trunk/conf/full.conf
@@ -19,6 +19,7 @@ pid                 ./objs/srs.pid;
 chunk_size          60000;
 # the logs dir.
 # if enabled ffmpeg, each stracoding stream will create a log file.
+# /dev/null to disable the log.
 # default: ./objs
 ff_log_dir          ./objs;
 # the log tank, console or file.
diff --git a/trunk/src/app/srs_app_config.cpp b/trunk/src/app/srs_app_config.cpp
index 1cfdcd66f..99e7f14a7 100644
--- a/trunk/src/app/srs_app_config.cpp
+++ b/trunk/src/app/srs_app_config.cpp
@@ -2410,6 +2410,12 @@ string SrsConfig::get_log_file()
     return conf->arg0();
 }
 
+bool SrsConfig::get_ffmpeg_log_enabled()
+{
+    string log = get_ffmpeg_log_dir();
+    return log != "/dev/null";
+}
+
 string SrsConfig::get_ffmpeg_log_dir()
 {
     srs_assert(root);
diff --git a/trunk/src/app/srs_app_config.hpp b/trunk/src/app/srs_app_config.hpp
index bdaa056f6..c655f9474 100644
--- a/trunk/src/app/srs_app_config.hpp
+++ b/trunk/src/app/srs_app_config.hpp
@@ -253,6 +253,7 @@ public:
     virtual bool                get_log_tank_file();
     virtual std::string         get_log_level();
     virtual std::string         get_log_file();
+    virtual bool                get_ffmpeg_log_enabled();
     virtual std::string         get_ffmpeg_log_dir();
 // hls section
 private:
diff --git a/trunk/src/app/srs_app_encoder.cpp b/trunk/src/app/srs_app_encoder.cpp
index 3c01f8ca8..63d3dcf6b 100644
--- a/trunk/src/app/srs_app_encoder.cpp
+++ b/trunk/src/app/srs_app_encoder.cpp
@@ -287,18 +287,20 @@ int SrsEncoder::initialize_ffmpeg(SrsFFMPEG* ffmpeg, SrsRequest* req, SrsConfDir
     output = srs_string_replace(output, "[stream]", req->stream);
     output = srs_string_replace(output, "[engine]", engine->arg0());
     
-    std::string log_file;
+    std::string log_file = "/dev/null"; // disabled
     // write ffmpeg info to log file.
-    log_file = _srs_config->get_ffmpeg_log_dir();
-    log_file += "/";
-    log_file += "ffmpeg-encoder";
-    log_file += "-";
-    log_file += req->vhost;
-    log_file += "-";
-    log_file += req->app;
-    log_file += "-";
-    log_file += req->stream;
-    log_file += ".log";
+    if (_srs_config->get_ffmpeg_log_enabled()) {
+        log_file = _srs_config->get_ffmpeg_log_dir();
+        log_file += "/";
+        log_file += "ffmpeg-encoder";
+        log_file += "-";
+        log_file += req->vhost;
+        log_file += "-";
+        log_file += req->app;
+        log_file += "-";
+        log_file += req->stream;
+        log_file += ".log";
+    }
 
     // important: loop check, donot transcode again.
     std::vector<std::string>::iterator it;
diff --git a/trunk/src/app/srs_app_ingest.cpp b/trunk/src/app/srs_app_ingest.cpp
index d33bb3359..da56e89fa 100644
--- a/trunk/src/app/srs_app_ingest.cpp
+++ b/trunk/src/app/srs_app_ingest.cpp
@@ -262,18 +262,20 @@ int SrsIngester::initialize_ffmpeg(SrsFFMPEG* ffmpeg, SrsConfDirective* vhost, S
         app = app.substr(0, pos);
     }
     
-    std::string log_file;
+    std::string log_file = "/dev/null"; // disabled
     // write ffmpeg info to log file.
-    log_file = _srs_config->get_ffmpeg_log_dir();
-    log_file += "/";
-    log_file += "ffmpeg-ingest";
-    log_file += "-";
-    log_file += vhost->arg0();
-    log_file += "-";
-    log_file += app;
-    log_file += "-";
-    log_file += stream;
-    log_file += ".log";
+    if (_srs_config->get_ffmpeg_log_enabled()) {
+        log_file = _srs_config->get_ffmpeg_log_dir();
+        log_file += "/";
+        log_file += "ffmpeg-ingest";
+        log_file += "-";
+        log_file += vhost->arg0();
+        log_file += "-";
+        log_file += app;
+        log_file += "-";
+        log_file += stream;
+        log_file += ".log";
+    }
     
     // input
     std::string input_type = _srs_config->get_ingest_input_type(ingest);
diff --git a/trunk/src/core/srs_core.hpp b/trunk/src/core/srs_core.hpp
index 5574688b8..78e86518c 100644
--- a/trunk/src/core/srs_core.hpp
+++ b/trunk/src/core/srs_core.hpp
@@ -31,7 +31,7 @@ CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 // current release version
 #define VERSION_MAJOR "0"
 #define VERSION_MINOR "9"
-#define VERSION_REVISION "116"
+#define VERSION_REVISION "117"
 #define RTMP_SIG_SRS_VERSION VERSION_MAJOR"."VERSION_MINOR"."VERSION_REVISION
 // server info.
 #define RTMP_SIG_SRS_KEY "SRS"