Many updates

scripts/shell/ffmpeg-get-video-res.sh

@@ -5,6 +5,11 @@ if [ $# -ne 1 ]; then
     exit 1
 fi
 
+if ! command -v "ffprobe" &> /dev/null; then
+    echo 'The "ffprobe" command is necessary in order to run the script, but was not found.'
+    exit 1
+fi
+
 input_file="$1"
 
 ffprobe -v error -select_streams v:0 -show_entries stream=width,height -of csv=s=x:p=0 "$input_file"