diff --git a/common.sh b/common.sh
index 61238dd..a3f9e73 100644
--- a/common.sh
+++ b/common.sh
@@ -53,19 +53,30 @@ axdraw () {
 	echo "END:$(date '+%s')"
 }
 
-get_outer_ratio () {
-	
-	AX=$(cat "${1}" | jq -r '.["0"]["0"].x')
-	AY=$(cat "${1}" | jq -r '.["0"]["0"].y')
-	BX=$(cat "${1}" | jq -r '.["0"]["1"].x')
-	BY=$(cat "${1}" | jq -r '.["0"]["1"].y')
-	CX=$(cat "${1}" | jq -r '.["0"]["2"].x')
-	CY=$(cat "${1}" | jq -r '.["0"]["2"].y')
-	DX=$(cat "${1}" | jq -r '.["0"]["3"].x')
-	DY=$(cat "${1}" | jq -r '.["0"]["3"].y')
+get_frame_axis () {
+	cat "${1}" | jq -r '.["'${2}'"]["'${3}'"].'${4}
+}
+
+get_outer_ratio_frame () {
+	AX=$(get_frame_axis ${1} ${2} 0 x)
+	AY=$(get_frame_axis ${1} ${2} 0 y)
+	BX=$(get_frame_axis ${1} ${2} 1 x)
+	BY=$(get_frame_axis ${1} ${2} 1 y)
+	CX=$(get_frame_axis ${1} ${2} 2 x)
+	CY=$(get_frame_axis ${1} ${2} 2 y)
+	DX=$(get_frame_axis ${1} ${2} 3 x)
+	DY=$(get_frame_axis ${1} ${2} 3 y)
 	ACX=$(echo "${CX}-${AX}" | bc)
 	DBX=$(echo "${DX}-${BX}" | bc)
 	ACY=$(echo "${AY}-${CY}" | bc)
 	DBY=$(echo "${DY}-${BY}" | bc)
 	echo "scale=4;((${ACY}+${DBY})/2) / ((${ACX}+${DBX})/2)" | bc
+}
+
+get_outer_ratio () {
+	A=$(get_outer_ratio_frame "${1}" 0)
+	B=$(get_outer_ratio_frame "${1}" 1)
+	C=$(get_outer_ratio_frame "${1}" 2)
+	D=$(get_outer_ratio_frame "${1}" 3)
+	echo "scale=4;(${A}+${B}+${C}+${D})/4" | bc
 }
\ No newline at end of file