diff --git a/src/ks-avi b/src/ks-avi
index 3d98f73..cc0c8d0 100755
--- a/src/ks-avi
+++ b/src/ks-avi
@@ -13,7 +13,8 @@ M_DATE="100223"
 ffmpeg_version=$(ffmpeg -version 2>&1 | grep version | head -1 | cut -d " " -f 3 | cut -d "." -f 1)
 IFS="abcdefghijklmnopqrstyvwxzABCDEFHIJKLMNOPQRSTYVWXZ@/()"
 ffmpeg_version=$(echo ${ffmpeg_version})
-IFS=""
+IFS=$' \t\n'
+unset IFS
 if [ -z "${ffmpeg_version}" ] ; then
   video_sync="vsync"
 else
diff --git a/src/ks-crop b/src/ks-crop
index 30cb3e3..42c68e9 100755
--- a/src/ks-crop
+++ b/src/ks-crop
@@ -13,7 +13,8 @@ M_DATE="100223"
 ffmpeg_version=$(ffmpeg -version 2>&1 | grep version | head -1 | cut -d " " -f 3 | cut -d "." -f 1)
 IFS="abcdefghijklmnopqrstyvwxzABCDEFHIJKLMNOPQRSTYVWXZ@/()"
 ffmpeg_version=$(echo ${ffmpeg_version})
-IFS=""
+IFS=$' \t\n'
+unset IFS
 if [ -z "${ffmpeg_version}" ] ; then
   video_sync="vsync"
 else
diff --git a/src/ks-mix b/src/ks-mix
index 02d3340..2b70fab 100755
--- a/src/ks-mix
+++ b/src/ks-mix
@@ -13,7 +13,8 @@ M_DATE="100223"
 ffmpeg_version=$(ffmpeg -version 2>&1 | grep version | head -1 | cut -d " " -f 3 | cut -d "." -f 1)
 IFS="abcdefghijklmnopqrstyvwxzABCDEFHIJKLMNOPQRSTYVWXZ@/()"
 ffmpeg_version=$(echo ${ffmpeg_version})
-IFS=""
+IFS=$' \t\n'
+unset IFS
 if [ -z "${ffmpeg_version}" ] ; then
   video_sync="vsync"
 else
diff --git a/src/ks-mp4 b/src/ks-mp4
index 76d7f30..4253bc3 100755
--- a/src/ks-mp4
+++ b/src/ks-mp4
@@ -13,7 +13,8 @@ M_DATE="100223"
 ffmpeg_version=$(ffmpeg -version 2>&1 | grep version | head -1 | cut -d " " -f 3 | cut -d "." -f 1)
 IFS="abcdefghijklmnopqrstyvwxzABCDEFHIJKLMNOPQRSTYVWXZ@/()"
 ffmpeg_version=$(echo ${ffmpeg_version})
-IFS=""
+IFS=$' \t\n'
+unset IFS
 if [ -z "${ffmpeg_version}" ] ; then
   video_sync="vsync"
 else
diff --git a/src/ks-mp4k b/src/ks-mp4k
index e3122c7..31d23fe 100755
--- a/src/ks-mp4k
+++ b/src/ks-mp4k
@@ -13,7 +13,8 @@ M_DATE="100223"
 ffmpeg_version=$(ffmpeg -version 2>&1 | grep version | head -1 | cut -d " " -f 3 | cut -d "." -f 1)
 IFS="abcdefghijklmnopqrstyvwxzABCDEFHIJKLMNOPQRSTYVWXZ@/()"
 ffmpeg_version=$(echo ${ffmpeg_version})
-IFS=""
+IFS=$' \t\n'
+unset IFS
 if [ -z "${ffmpeg_version}" ] ; then
   video_sync="vsync"
 else
diff --git a/src/ks-mp4s b/src/ks-mp4s
index a5df4bc..0ce6d7e 100755
--- a/src/ks-mp4s
+++ b/src/ks-mp4s
@@ -13,7 +13,8 @@ M_DATE="100223"
 ffmpeg_version=$(ffmpeg -version 2>&1 | grep version | head -1 | cut -d " " -f 3 | cut -d "." -f 1)
 IFS="abcdefghijklmnopqrstyvwxzABCDEFHIJKLMNOPQRSTYVWXZ@/()"
 ffmpeg_version=$(echo ${ffmpeg_version})
-IFS=""
+IFS=$' \t\n'
+unset IFS
 if [ -z "${ffmpeg_version}" ] ; then
   video_sync="vsync"
 else