Fix from https://github.com/zorbaTheRainy for images throwing segfaults on has_audio

subgen.py

@@ -223,6 +223,15 @@ def appendLine(result):
         # Append the new segment to the result's segments
         result.segments.append(newSegment)
 
+def has_image_extension(file_path):
+    valid_extensions = ['.rgb', '.gif', '.pbm', '.pgm', '.ppm', '.tiff', '.rast', '.xbm', '.jpg', '.jpeg', '.bmp', '.png', '.webp', '.exr', '.bif'] # taken from the extensions detected by the imghdr module & added Emby's '.bif' files
+    
+    if os.path.exists(file_path):
+        file_extension = os.path.splitext(file_path)[1].lower()
+        return file_extension in valid_extensions
+    else:
+        return True # return a value that causes the file to be skipped.
+
 @app.get("/plex")
 @app.get("/webhook")
 @app.get("/jellyfin")
@@ -772,6 +781,8 @@ def get_jellyfin_admin(users):
 def has_audio(file_path):
     try:
         with av.open(file_path) as container:
+            if has_image_extension(file_path):
+                return False
             return any(stream.type == 'audio' for stream in container.streams)
     except (av.AVError, UnicodeDecodeError):
         return False