add compress-music.sh

compress-music.sh

@@ -0,0 +1,34 @@
+#!/bin/bash
+set -e
+
+source="$HOME/kskcloud/Musik/"
+tmp="$HOME/Musik.tiny/"
+destination="$HOME/kskcloud/Musik.tiny/"
+placeholder="$destination/a"
+
+rm -rf "$tmp"
+mkdir "$tmp"
+
+mkdir -p "$destination"
+
+# create a placeholder to prevent * from failing
+touch "$placeholder"
+
+# copy original target files and existing files as cache
+echo 'copying . . .'
+cp -a --reflink=always "$source/"* "$destination/"* "$tmp"
+
+# compress with opus; +e because ffmpeg errors on .jpg, .txt, etc.
+echo 'compressing . . .'
+set +e
+find "$tmp" -type f -not -name '*.opus' | parallel --eta --progress 'ffmpeg -v 0 -n -i ""{}"" -c:a libopus -map_metadata 0 -b:a 128k ""{.}.opus""'
+set -e
+
+# delete all non-opus files
+echo 'deleting . . .'
+find "$tmp" -type f -not -name '*.opus' -delete
+
+# copy compressed files to target destination
+cp -a --reflink=always "$tmp/"* "$destination"
+
+rm -r "$tmp"