diff --git a/delete_vidoes_without_sub.sh b/delete_vidoes_without_sub.sh
new file mode 100755
index 0000000..8467ac1
--- /dev/null
+++ b/delete_vidoes_without_sub.sh
@@ -0,0 +1,13 @@
+#!/bin/sh
+cd ../original
+for f in *; do
+	if [ ! -f "../subs/${f%.*}.de.vtt" ]; then
+		rm "$f"
+	fi
+done
+cd ../subs/
+for f in *; do
+	if [ ! -f "../original/${f%.*}.mp4" ]; then
+		rm "$f"
+	fi
+done
diff --git a/download.sh b/download.sh
index 3c51c84..168568a 100755
--- a/download.sh
+++ b/download.sh
@@ -5,8 +5,8 @@ mkdir ../original
 
 #download subs
 cd ../subs
-youtube-dl --write-auto-sub --yes-playlist --skip-download -o '%(playlist_index)s.%(ext)s' $1
+youtube-dl --write-auto-sub --sub-lang de --yes-playlist -i --skip-download -o '%(playlist_index)s.%(ext)s' $1
 
 # download videos
 cd ../original
-youtube-dl -f 22 --yes-playlist -o '%(playlist_index)s.%(ext)s' $1
\ No newline at end of file
+youtube-dl -f 22 --yes-playlist -i -o '%(playlist_index)s.%(ext)s' $1
diff --git a/render_video.sh b/render_video.sh
new file mode 100755
index 0000000..1869add
--- /dev/null
+++ b/render_video.sh
@@ -0,0 +1,4 @@
+#!/bin/sh
+cd ../out
+find *.mp4 | sed 's:\ :\ :g'| sed 's/^/file /' > list.txt
+ffmpeg -f concat -safe 0 -segment_time_metadata 1 -i list.txt -vf select=concatdec_select -af aselect=concatdec_select,aresample=async=1 final.mp4