Add init checks

app.py

@@ -15,10 +15,33 @@ OUT_PPT_NAME=   PPTX_DEST
 NO_IMAGES   =   False
 QUESTIONS   =   5
 
+def init_check():
+    # check for google-chrome
+    if os.system("google-chrome --version") != 0:
+        logger.critical("Google Chrome is not installed")
+        # raise Exception("Google Chrome is not installed")
+    
+    if os.system("npm --version") != 0:
+        logger.critical("npm is not installed")
+        # raise Exception("npm is not installed")
+    
+    if os.system("npx --version") != 0:
+        logger.critical("npx is not installed")
+        # raise Exception("npx is not installed")
+    
+    if os.system("ffmpeg --version") != 0:
+        logger.critical("ffmpeg is not installed")
+        # raise Exception("ffmpeg is not installed")
+    
+    logger.info("Init check done, look for errors above..")
+
 def gradio_run(
     video_id, chunk_size: int,
     no_images: bool, no_chapters: bool, out_type="pdf"):
     
+    # do init check
+    init_check()
+    
     VIDEO_ID = video_id
     CHUNK_SIZE = chunk_size
     NO_IMAGES = no_images