diff --git a/to_opus/README.md b/to_opus/README.md
new file mode 100644
index 0000000..ddf230c
--- /dev/null
+++ b/to_opus/README.md
@@ -0,0 +1,36 @@
+# to_vp9
+This Script is unfinished and not usable.
+
+# to_opus
+converting 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.
+
+If used on containers with video- or multiple audiostreams, this skript will only convert the audiostream and copy all streams in a Matroska container.
+
+### Flags
+```-e``` defines the extension of the files that should be converted<br>
+```-d``` deletes original files after conversion<br>
+```-h``` show help (not implemented)
+
+### Examples
+
+convert all files to opus<br>
+```bash to_opus.sh -e "*"```
+
+convert all files with .mp3-extension and .flac-extension to opus and deletes original files after that<br>
+```bash to_opus.sh -e mp3 -e flac```
+
+convert the audiostream of an movie<br>
+```bash to_opus.sh -e mp4```
+
+### Dependencies
+- ffmpeg
+- Bash 4^
+
+### Why opus? 
+
+Opus is an open format and royalty free. It is FOSS.
+It is supported on most platforms and has a better quality per bitrate then formats like mp3 or Vorbis.
+
+![Opus Quality comparison with other formats](https://upload.wikimedia.org/wikipedia/commons/0/01/Opus_quality_comparison.svg)
\ No newline at end of file
diff --git a/to_opus.sh b/to_opus/to_opus.sh
old mode 100644
new mode 100755
similarity index 100%
rename from to_opus.sh
rename to to_opus/to_opus.sh
diff --git a/to_vp9.sh b/to_vp9/to_vp9.sh
old mode 100644
new mode 100755
similarity index 53%
rename from to_vp9.sh
rename to to_vp9/to_vp9.sh
index 3a2bc07..26b7e69
--- a/to_vp9.sh
+++ b/to_vp9/to_vp9.sh
@@ -44,10 +44,12 @@ while :; do
 		encoder=$(echo ${encoders[$encoder]} | awk '{print $2}')
 		break
 	else
-		echo "number out of range, try again"
+		echo "Not a valid encoder, try again"
 	fi
 done
 
+# Choose an GPU, if encoder is GPU accelerated
+
 # write array into string
 extension="${extension[*]}"
 # change separator
@@ -55,4 +57,22 @@ extension=${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
+	
+	#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