diff --git a/to_vp9/to_vp9.sh b/to_vp9/to_vp9.sh
index ef3df02..388c919 100755
--- a/to_vp9/to_vp9.sh
+++ b/to_vp9/to_vp9.sh
@@ -51,6 +51,9 @@ done
 # Choose an GPU, if encoder is GPU accelerated
 # ls /sys/class/drm/renderD129/device/consumer*/consumer/ | grep supp
 # lspci | grep ' VGA ' | cut -d" " -f 1 | xargs -i lspci -v -s {}
+gpu="/dev/dri/renderD129"
+
+# encoder-specific settings
 
 # write array into string
 extension="${extension[*]}"
@@ -61,11 +64,14 @@ for file in **/*.@($extension); do
 	echo "$encoder"
 
 	#VP9_vaapi
-	#there are problems with the -global_quality:v settings only being able to make quality worse. Help is appreciated
-	#ffmpeg -hwaccel vaapi -vaapi_device /dev/dri/renderD129 -i "$file" -map 0 -c copy -c:v vp9_vaapi -rc_mode CQP -bf 1 -bsf:v vp9_raw_reorder,vp9_superframe -compression_level 0 -vf 'hwupload' Der\ VornameCqpLA.mkv
+	#there are problems with the -global_quality:v/-q:v settings only being able to make quality worse. Help is appreciated
+	#not enough tested. So it is still experimental
+	#ffmpeg -hwaccel vaapi -vaapi_device $gpu -i "$file" -map 0 -c copy -c:v vp9_vaapi -rc_mode CQP -bf 1 -bsf:v vp9_raw_reorder,vp9_superframe -vf 'hwupload' "${file%.*}.mkv"
 	
 	#VP9_qsv
 	#was not able to test it. So it is still experimental
-	#ffmpeg -hwaccel qsv -qsv_device /dev/dri/renderD129 -i "$file" -c:v av1_qsv -vf 'hwupload' output.mkv
+	#ffmpeg -hwaccel qsv -qsv_device $gpu -i "$file" -c:v av1_qsv -vf 'hwupload' "${file%.*}.mkv"
 
+	#libvpx-vp9
+	#...
 done