fixing renderText script

screencap.sh

@@ -0,0 +1,36 @@
+#!/bin/bash
+# Generates an ffmpeg command line for capturing a given X11 window.
+# Usage: $0 [optional output file name]
+# It will prompt you to click on the window you want to capture.
+# Output is simply echoed, for use in copy/pasting (adjusting/adding
+# parameters as needed).
+# Tip: the command uses screen coordinates, so do not resize or move
+# the target window once capturing as begun.
+echo "Click the window to capture..."
+
+tmpfile=/tmp/screengrab.tmp.$$
+trap 'touch $tmpfile; rm -f $tmpfile' 0
+
+xwininfo > $tmpfile 2>/dev/null
+left=$(grep 'Absolute upper-left X:' $tmpfile | awk '{print $4}');
+top=$(grep 'Absolute upper-left Y:' $tmpfile | awk '{print $4}');
+width=$(grep 'Width:' $tmpfile | awk '{print $2}');
+height=$(grep 'Height:' $tmpfile | awk '{print $2}');
+geom="-geometry ${width}x${height}+${left}+${top}"
+echo "Geometry: ${geom}"
+size="${width}x${height}"
+pos="${left},${top}"
+echo "pos=$pos size=$size"
+
+out=${1-screengrab.avi}
+#test -f $out && rm $out
+
+framerate=4
+echo "# ffmpeg command"
+echo -n "sleep 2; " # give caller time to switch to captured window
+echo ffmpeg -f x11grab \
+  -r ${framerate} \
+  -s ${size} \
+  -i ${DISPLAY-0:0}+${pos} \
+  -sameq \
+  $out