ytdl-music: added update check for yt-dlp and ffmpeg requirement

downloads/ytdl-music.sh

@@ -10,5 +10,16 @@ if [ -z "$PLAYLISTURL" ]; then
         exit 1
 fi
 
+if ! which ffmpeg > /dev/null 2>&1; then
+    echo "Error: ffmpeg is not installed. Please install ffmpeg before running this script."
+    exit 1
+fi
+
+ffmpeg -version | head -n 1
+
+yt-dlp -U || exit $?
+
+sleep 2
+
 # Use double quotes for variables within the yt-dlp command
 yt-dlp -f 'ba' -x --audio-format mp3 "$PLAYLISTURL" -o "$TARGETPATH/$LIBRARY_NAME/%(playlist)s/%(title)s.%(ext)s"