diff --git a/examples/librispeech/s1/README.md b/examples/librispeech/s1/README.md
index 080b340e..7f89b808 100644
--- a/examples/librispeech/s1/README.md
+++ b/examples/librispeech/s1/README.md
@@ -1,5 +1,12 @@
 # LibriSpeech
 
+## Data
+
+| Data Subset | Duration in Seconds | 
+| data/manifest.train |  0.83s ~ 29.735s | 
+| data/manifest.dev | 1.065 ~ 35.155s |  
+| data/manifest.test-clean | 1.285s ~ 34.955s | 
+
 ## Conformer
 
 | Model | Params | Config | Augmentation| Test set | Decode method | Loss | WER |  
diff --git a/examples/librispeech/s1/path.sh b/examples/librispeech/s1/path.sh
index 30adb6ca..22fb1255 100644
--- a/examples/librispeech/s1/path.sh
+++ b/examples/librispeech/s1/path.sh
@@ -1,10 +1,10 @@
 export MAIN_ROOT=${PWD}/../../../
 
-export PATH=${MAIN_ROOT}:${MAIN_ROOT}/utils:${PATH}
+export PATH=${MAIN_ROOT}:${PWD}/utils:${PATH}
 export LC_ALL=C
 
 # Use UTF-8 in Python to avoid UnicodeDecodeError when LC_ALL=C
-export PYTHONIOENCODING=UTF-8 
+export PYTHONIOENCODING=UTF-8
 export PYTHONPATH=${MAIN_ROOT}:${PYTHONPATH}
 
 export LD_LIBRARY_PATH=${LD_LIBRARY_PATH}:/usr/local/lib/
diff --git a/examples/librispeech/s1/utils b/examples/librispeech/s1/utils
new file mode 120000
index 00000000..973afe67
--- /dev/null
+++ b/examples/librispeech/s1/utils
@@ -0,0 +1 @@
+../../../utils
\ No newline at end of file
diff --git a/setup.sh b/setup.sh
index 384d62d2..b340d47b 100644
--- a/setup.sh
+++ b/setup.sh
@@ -10,7 +10,7 @@ fi
 
 if [ -e /etc/lsb-release ];then
     #${SUDO} apt-get update
-    ${SUDO} apt-get install -y vim tig tree sox pkg-config libflac-dev libogg-dev libvorbis-dev libboost-dev swig python3-dev
+    ${SUDO} apt-get install -y jq vim tig tree sox pkg-config libflac-dev libogg-dev libvorbis-dev libboost-dev swig python3-dev
     if [ $? != 0 ]; then
         error_msg "Please using Ubuntu or install pkg-config libflac-dev libogg-dev libvorbis-dev libboost-dev swig python3-dev by user."
         exit -1
@@ -54,10 +54,10 @@ if [ $? != 0 ]; then
     fi
     cd AutoLog
     pip install -r requirements.txt
-    python setup.py install 
+    python setup.py install
     cd ..
     rm -rf AutoLog
-fi 
+fi
 
 # install decoders
 python3 -c "import pkg_resources; pkg_resources.require(\"swig_decoders==1.1\")"
diff --git a/utils/duration_from_maniefst.sh b/utils/duration_from_maniefst.sh
new file mode 100644
index 00000000..fae579c7
--- /dev/null
+++ b/utils/duration_from_maniefst.sh
@@ -0,0 +1,10 @@
+#!/bin/bash
+
+if [ $# == 1 ];then
+    echo "usage: ${0} manifest_file"
+    exit -1
+fi
+
+manifest=$1
+
+jq -S '.feat_shape[0]' ${manifest} | sort -nu