diff --git a/README.md b/README.md
index bd7b30df3..6d7c20ca3 100755
--- a/README.md
+++ b/README.md
@@ -525,6 +525,7 @@ Supported operating systems and hardware:
 
 ### SRS 2.0 history
 
+* v2.0, 2015-01-29, build libfdk-aac in ffmpeg. 2.0.108
 * v2.0, 2015-01-25, for [#301](https://github.com/winlinvip/simple-rtmp-server/issues/301), hls support h.264+mp3, ok for vlc. 2.0.107
 * v2.0, 2015-01-25, for [#301](https://github.com/winlinvip/simple-rtmp-server/issues/301), http ts stream support h.264+mp3. 2.0.106
 * v2.0, 2015-01-25, hotfix [#268](https://github.com/winlinvip/simple-rtmp-server/issues/268), refine the pcr start at 0, dts/pts plus delay. 2.0.105
diff --git a/trunk/3rdparty/fdk-aac-0.1.3.zip b/trunk/3rdparty/fdk-aac-0.1.3.zip
new file mode 100644
index 000000000..c7aeab7bd
Binary files /dev/null and b/trunk/3rdparty/fdk-aac-0.1.3.zip differ
diff --git a/trunk/3rdparty/readme.txt b/trunk/3rdparty/readme.txt
index 315a7576d..6b7d071b1 100644
--- a/trunk/3rdparty/readme.txt
+++ b/trunk/3rdparty/readme.txt
@@ -23,6 +23,9 @@ x264-snapshot-20131129-2245-stable.tar.bz2 (core.138)
     for srs to support live stream transcoding.
     remark: we use *.zip for all linux plantform.
 
+fdk-aac-0.1.3.zip
+    https://github.com/mstorsjo/fdk-aac/releases
+
 tools/ccache-3.1.9.zip
     to fast build.
     
diff --git a/trunk/auto/build_ffmpeg.sh b/trunk/auto/build_ffmpeg.sh
index cc66eca4b..b52d4ce94 100755
--- a/trunk/auto/build_ffmpeg.sh
+++ b/trunk/auto/build_ffmpeg.sh
@@ -19,6 +19,9 @@ echo "SRS_JOBS: ${SRS_JOBS}"
 mkdir -p ${ff_build_dir}
 mkdir -p ${ff_release_dir}
 
+# for ubuntu14, donot compile libaacplus.
+UBUNTU14=NO;grep -in "Ubuntu 14." /etc/issue >/dev/null 2>&1; if [[ $? -eq 0 ]]; then UBUNTU14=YES; fi
+
 # yasm for libx264
 ff_yasm_bin=${ff_release_dir}/bin/yasm
 if [[ -f ${ff_yasm_bin} ]]; then 
@@ -35,18 +38,38 @@ fi
 # ffmpeg can specifies the yasm path when configure it.
 export PATH=${PATH}:${ff_release_dir}/bin
 
-# libaacplus
-if [[ -f ${ff_release_dir}/lib/libaacplus.a ]]; then
-    echo "libaacplus is ok"
+# the aac command for ffmepg.
+AAC_FOR_FFMPEG="--enable-libfdk-aac"
+
+# libfdk-aac
+if [[ -f ${ff_release_dir}/lib/libfdk-aac.a ]]; then
+    echo "libfdk_aac is ok"
 else
-    echo "build yasm-1.2.0"
+    echo "build fdk-aac-0.1.3"
     cd $ff_current_dir &&
-    rm -rf libaacplus-2.0.2 && unzip -q ${ff_src_dir}/libaacplus-2.0.2.zip &&
-    cd libaacplus-2.0.2 && cp ../${ff_src_dir}/libaacplus-patch-26410-800.zip src/26410-800.zip &&
-    bash autogen.sh && ./configure --prefix=${ff_release_dir} --enable-static && make && make install
-    ret=$?; if [[ 0 -ne ${ret} ]]; then echo "build libaacplus-2.0.2 failed"; exit 1; fi
+    rm -rf fdk-aac-0.1.3 && unzip -q ${ff_src_dir}/fdk-aac-0.1.3.zip &&
+    cd fdk-aac-0.1.3 && bash autogen.sh && ./configure --prefix=${ff_release_dir} --enable-static && make ${SRS_JOBS} && make install &&
+    ret=$?; if [[ 0 -ne ${ret} ]]; then echo "build fdk-aac-0.1.3 failed"; exit 1; fi
 fi
 
+# libaacplus
+if [ $UBUNTU14 = NO ]; then
+    AAC_FOR_FFMPEG="$AAC_FOR_FFMPEG --enable-libaacplus"
+
+    if [[ -f ${ff_release_dir}/lib/libaacplus.a ]]; then
+        echo "libaacplus is ok"
+    else
+        echo "build libaacplus-2.0.2"
+        cd $ff_current_dir &&
+        rm -rf libaacplus-2.0.2 && unzip -q ${ff_src_dir}/libaacplus-2.0.2.zip &&
+        cd libaacplus-2.0.2 && cp ../${ff_src_dir}/libaacplus-patch-26410-800.zip src/26410-800.zip &&
+        bash autogen.sh && ./configure --prefix=${ff_release_dir} --enable-static && make && make install
+        ret=$?; if [[ 0 -ne ${ret} ]]; then echo "build libaacplus-2.0.2 failed"; exit 1; fi
+    fi
+fi
+
+echo "aac for ffmepg: $AAC_FOR_FFMPEG"
+
 # lame-3.99
 if [[ -f ${ff_release_dir}/lib/libmp3lame.a ]]; then
     echo "libmp3lame is ok"
@@ -105,7 +128,7 @@ else
         --extra-ldflags='-L${ffmpeg_exported_release_dir}/lib -lm -ldl' \
         --disable-ffplay --disable-ffprobe --disable-ffserver --disable-doc \
         --enable-postproc --enable-bzlib --enable-zlib --enable-parsers \
-        --enable-libx264 --enable-libmp3lame --enable-libaacplus --enable-libspeex \
+        --enable-libx264 --enable-libmp3lame $AAC_FOR_FFMPEG --enable-libspeex \
         --enable-pthreads --extra-libs=-lpthread \
         --enable-encoders --enable-decoders --enable-avfilter --enable-muxers --enable-demuxers && 
     make ${SRS_JOBS} && make install
diff --git a/trunk/src/core/srs_core.hpp b/trunk/src/core/srs_core.hpp
index 0e1d5d7db..1d21f36e4 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       2
 #define VERSION_MINOR       0
-#define VERSION_REVISION    107
+#define VERSION_REVISION    108
 
 // server info.
 #define RTMP_SIG_SRS_KEY "SRS"