encode-mpg: Correctly handle arguments with spaces

tools/encode-mpg.sh

@@ -5,6 +5,6 @@ if (( $# != 2 )); then
     exit
 fi
 
-ffmpeg -i $1 -vf scale=128:96 -c:v mpeg1video -b:v 96k -ac 1 -c:a mp2 -format mpeg -b:a 64k  -ar 48000  -r 24 $2 
+ffmpeg -i "$1" -vf scale=128:96 -c:v mpeg1video -b:v 96k -ac 1 -c:a mp2 -format mpeg -b:a 64k  -ar 48000  -r 24 "$2"