Add ssim shell function

home/.zshrc.local

@@ -125,6 +125,10 @@ function mkvextract-all-attachments() {
     mkvextract $1 attachments $(mkvmerge --identify $1|grep "Attachment ID"|sed "s/Attachment ID \([0-9]*\): .*/\1/")
 }
 
+function ssim() {
+    ffmpeg -loglevel fatal -i "$1" -i "$2" -lavfi 'ssim=/dev/stdout' -f null -
+}
+
 # Audacious does not support symlinks; hack around that
 function audacious-hack() (
     IFS=$'\n'