Use ffmpeg 7.1 as build default

Author: WyattBlue

scripts/activate.sh

@@ -17,7 +17,7 @@ if [[ ! "$PYAV_LIBRARY" ]]; then
             return 1
         fi
     else
-        PYAV_LIBRARY=ffmpeg-7.0.2
+        PYAV_LIBRARY=ffmpeg-7.1
         echo "No \$PYAV_LIBRARY set; defaulting to $PYAV_LIBRARY"
     fi
 fi