diff --git a/to_opus/README.md b/to_opus/README.md
index 288a46f..d76e423 100644
--- a/to_opus/README.md
+++ b/to_opus/README.md
@@ -1,5 +1,5 @@
 # to_opus
-converting all audiostreams in all files with given file extension in your current working directory and all subdirectories to opus.
+This script converts all audiostreams in all files with given file extension in your current working directory and all subdirectories to opus.
 The Script will choose an automatic bitrate for every audiostream dependent on the number of channels and the original bitrate.
 See https://wiki.xiph.org/Opus_Recommended_Settings for more information about this.
 
diff --git a/to_opus/to_opus.sh b/to_opus/to_opus.sh
index 054eea2..d0424e7 100755
--- a/to_opus/to_opus.sh
+++ b/to_opus/to_opus.sh
@@ -41,16 +41,15 @@ for file in **/*.@($extension); do
 	readarray -t bitrates <<<"$(ffprobe -v error -select_streams a -show_entries stream=bit_rate -of compact=p=0:nk=1 "$file")"
 
 	# set a channel dependend bitrate for every audio stream
-	# https://wiki.xiph.org/Opus_Recommended_Settings
 	# to use ffmpegs default just comment out this block
 	for ((index=0; index<${#channels[@]};index++)); do
 		if [[ ${channels[index]} -eq 1 ]]; then
-			if [[ $bitrates == 'N/A' || ${bitrates[index]} -gt 64000 ]]; then bitrate_settings="$bitrate_settings-b:a:$index 64k "; fi
+			if [[ ${bitrates[index]} == 'N/A' || ${bitrates[index]} -gt 64000 ]]; then bitrate_settings="$bitrate_settings-b:a:$index 64k "; fi
 		elif [[ ${channels[index]} -eq 2 ]]; then
-			if [[ $bitrates == 'N/A' || ${bitrates[index]} -gt 128000 ]]; then bitrate_settings="$bitrate_settings-b:a:$index 128k "; fi
+			if [[ ${bitrates[index]} == 'N/A' || ${bitrates[index]} -gt 128000 ]]; then bitrate_settings="$bitrate_settings-b:a:$index 128k "; fi
 		elif [[ ${channels[index]} -lt 6 ]]; then
-			if [[ $bitrates == 'N/A' || ${bitrates[index]} -gt 256000 ]]; then bitrate_settings="$bitrate_settings-b:a:$index 256k "; fi
-		elif [[ $bitrates == 'N/A' || ${bitrates[index]} -gt 450000 ]]; then bitrate_settings="$bitrate_settings-b:a:$index 450k "; fi
+			if [[ ${bitrates[index]} == 'N/A' || ${bitrates[index]} -gt 256000 ]]; then bitrate_settings="$bitrate_settings-b:a:$index 256k "; fi
+		elif [[ ${bitrates[index]} == 'N/A' || ${bitrates[index]} -gt 450000 ]]; then bitrate_settings="$bitrate_settings-b:a:$index 450k "; fi
 	done
 
 	# check if it contains video streams (Thumbnails etc. will be ignored)
diff --git a/to_vp9/README.md b/to_vp9/README.md
index 1e744b2..07f2a95 100644
--- a/to_vp9/README.md
+++ b/to_vp9/README.md
@@ -1,2 +1,25 @@
 # to_vp9
-This Script is unfinished and not usable
+This Script is unfinished and not ready for usage.
+
+This script converts all videostreams in all files with given file extension in your current working directory and all subdirectories to vp9.
+The standard settings are in my opinion good for personal storage of movies. Feel free to change them or suggest changes.
+
+If used on containers with subtitles or audiostreams, this skript will only convert the videostream and copy the other streams in a Matroska container.
+### Encoders
+
+### VP9_vaapi
+
+Needs [Hardware video acceleration](https://wiki.archlinux.org/title/Hardware_video_acceleration) enabled and libva
+More Information about this:
+- https://ffmpeg.org/ffmpeg-all.html#VAAPI-encoders
+- https://trac.ffmpeg.org/wiki/Hardware/VAAPI
+
+### VP9_qsv
+
+Needs [Hardware video acceleration](https://wiki.archlinux.org/title/Hardware_video_acceleration) enabled, intel graphics and ffmpeg with --enable-libmfx or --enable-libvpl.
+More Information about this:
+- [Differences between libvpl and libmfx](https://www.intel.com/content/www/us/en/developer/articles/technical/onevpl-in-ffmpeg-for-great-streaming-on-intel-gpus.html)
+- https://ffmpeg.org/ffmpeg-all.html#QSV-Encoders
+- https://trac.ffmpeg.org/wiki/Hardware/QuickSync
+- https://www.intel.com/content/www/us/en/developer/articles/technical/common-bitrate-control-methods-in-intel-media-sdk.html
+- https://www.intel.com/content/www/us/en/developer/articles/technical/advanced-bitrate-control-methods-in-intel-media-sdk.html
\ No newline at end of file
diff --git a/to_vp9/to_vp9.sh b/to_vp9/to_vp9.sh
index d0d9fe6..e322607 100755
--- a/to_vp9/to_vp9.sh
+++ b/to_vp9/to_vp9.sh
@@ -49,6 +49,8 @@ while :; do
 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 {}
 
 # write array into string
 extension="${extension[*]}"
@@ -57,22 +59,11 @@ extension=${extension// /|}
 
 for file in **/*.@($extension); do
 	echo "$encoder"
-	
-	#https://wiki.archlinux.org/title/Hardware_video_acceleration
 
 	#VP9_vaapi
-	#Hardware video acceleration enabled
-	#https://ffmpeg.org/ffmpeg-all.html#VAAPI-encoders
-	#https://trac.ffmpeg.org/wiki/Hardware/VAAPI
-	#ffmpeg -hwaccel vaapi -vaapi_device /dev/dri/renderD129 -i "$file" -map 0 -c copy -c:v vp9_vaapi -rc_mode CQP -look_ahead 1 -bf 2 -bsf:v vp9_raw_reorder,vp9_superframe -compression_level 0 -vf 'hwupload' Der\ VornameCqpLA.mkv
+	#ffmpeg -hwaccel vaapi -vaapi_device /dev/dri/renderD129 -i "$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
 	
 	#VP9_qsv
-	#--enable-libmfx or --enable-libvpl and Hardware video acceleration enabled
-	#libvpl vs. libmfx: https://www.intel.com/content/www/us/en/developer/articles/technical/onevpl-in-ffmpeg-for-great-streaming-on-intel-gpus.html
-	#https://ffmpeg.org/ffmpeg-codecs.html
-	#https://trac.ffmpeg.org/wiki/Hardware/QuickSync
-	#https://www.intel.com/content/www/us/en/developer/articles/technical/common-bitrate-control-methods-in-intel-media-sdk.html
-	#https://www.intel.com/content/www/us/en/developer/articles/technical/advanced-bitrate-control-methods-in-intel-media-sdk.html
 	#ffmpeg -hwaccel qsv -qsv_device /dev/dri/renderD129 -i "$file" -c:v av1_qsv -vf 'hwupload' output.mkv
 
 done