Add vcompare, a shortcut for having two videos play side by side in mpv.

rc_shared.sh

@@ -1189,6 +1189,28 @@ function pv3 {
 	echo -e "\n * Success! *"
 }
 
+# 20260915 - Stack 2 videos for comparing quality.
+function vcompare {
+	vid1="$1"
+	vid2="$2"
+	if [[ -z $vid1 || -z $vid2 ]]; then
+		echo "ERROR: Missing vid1 ('$vid1') or vid2 ('$vid2'). "
+		return 1
+	fi
+
+	orientation="$3"
+	if [[ -z $orientation || ($orientation != "h" && $orientation != "v") ]]; then
+		echo -n "NOTICE: Received '$orientation' for orientation, using vertical instead. "
+		orientation="v"
+		echo "'$orientation'"
+	fi
+
+	mpv --lavfi-complex="[vid1][vid2]${orientation}stack[vo];[aid1][aid2]amix[ao]" \
+		"$vid1" \
+		--external-file="$vid2"
+}
+alias vcomp="vcompare "
+
 
 ### Web ###