diff --git a/scripts/extract.sh b/scripts/extract.sh
index f221537..5b9312f 100644
--- a/scripts/extract.sh
+++ b/scripts/extract.sh
@@ -52,6 +52,22 @@ function extract_chapters ()
 	echo "DUMMY"
 }
 
+function extract_framedurations () # $1: stream index
+{
+	local FileIndex=0
+	echo "ffconcat version 1.0" > "$FrameDurationList"
+	while read Line
+	do
+		if echo "$Line" | grep -qF 'pts_time='; then
+			((FileIndex++))
+			printf "file \'./$(basename $FramesUpscaledDir)/%06d.png\'\n" "$FileIndex" >> "$FrameDurationList"
+			echo "inpoint $(echo "$Line" | grep -Po '\d+\.\d+')" >> "$FrameDurationList"
+		elif echo "$Line" | grep -qF 'duration_time='; then
+			echo "duration $(echo "$Line" | grep -Po '\d+\.\d+')" >> "$FrameDurationList"
+		fi
+	done < <(ffprobe -v quiet -show_entries packet=pts_time,duration_time -select_streams "$Index" "$InputFile")
+}
+
 if [[ -z "$1" ]]; then
 	echo "You must specify the video file"
 	exit "$PARAMETER_ERROR"
@@ -89,6 +105,7 @@ do
 	
 	case "$Type" in
 		video )
+			extract_framedurations "$Index"
 			ffmpeg -hide_banner -i "$InputFile" -map "0:$Index" -c:v copy "$VideoDir/$Index.$Extension"
 			if [[ "$?" != 0 ]]; then exit "$EXTRACT_AUDIO_ERROR"; fi ;;
 		audio )
diff --git a/scripts/frames.sh b/scripts/frames.sh
index 3548668..03eb138 100644
--- a/scripts/frames.sh
+++ b/scripts/frames.sh
@@ -23,8 +23,8 @@ if ! [[ -r "$InputFile" ]]; then
 fi
 
 rm -rf "$FramesDir"; mkdir -p "$FramesDir"
-	
-ffmpeg -hide_banner -i "$InputFile" -r "$(framerate)" -f image2 "$FramesDir/%06d.png"
+# passthrough
+ffmpeg -hide_banner -i "$InputFile" -r "$(framerate)" -f image2 -vsync vfr "$FramesDir/%06d.png"
 
 if [[ "$?" != 0 ]]; then
 	exit "$CONVERT_TO_FRAMES_ERROR"
diff --git a/scripts/video.sh b/scripts/video.sh
index 637d308..13e5898 100644
--- a/scripts/video.sh
+++ b/scripts/video.sh
@@ -56,12 +56,20 @@ rm -rf "$VideoUpscaledDir"; mkdir -p "$VideoUpscaledDir"
 
 VideoUpscaled="$VideoUpscaledDir/video.mp4"
 
+#	-f "image2" \
+#	-framerate "$(framerate)" \
+#	-i "$FramesUpscaledDir/%06d.png" \
+#	-r "$(framerate)" \	 
+# -vf fps="$(framerate)" \
+#
+
 ffmpeg \
 	-hide_banner \
-	-f "image2" \
-	-framerate "$(framerate)" \
-	-i "$FramesUpscaledDir/%06d.png" \
-	-r "$(framerate)" \
+	-f "concat" \
+	-safe 0 \
+	-i "$FrameDurationList" \
+	-vsync vfr \
+	-r "42" \
 	-vcodec "$VideoCodec" \
 	-preset "$Preset"  \
 	-pix_fmt "$PixelFormat" \
diff --git a/video2d-2x b/video2d-2x
index 88942c5..9036643 100644
--- a/video2d-2x
+++ b/video2d-2x
@@ -42,6 +42,7 @@ readonly VideoUpscaledDir="${VideoDir}_upscaled"
 readonly FormatJson="$OutputDir/format.json"
 readonly StreamsJson="$OutputDir/streams.json"
 readonly ChaptersJson="$OutputDir/chapters.json"
+readonly FrameDurationList="$OutputDir/frameduration.list"
 
 readonly RangesList="$OutputDir/ranges.list"