fix bugs

app.py

@@ -20,6 +20,12 @@ import LRC2SRT
 
 path = ""  # Update with your path
 
+def safe_read(i: int, a: list):
+    if i > len(a):
+        return None
+    else:
+        return a[i]
+
 def getTrigger(ad: int, a: list, max: int = 1024) -> int:
     i = ad
     while not (a[i] < 120 and not a[i + 6] < 130 or i - ad > max):
@@ -48,7 +54,7 @@ def totopleft(coord, width=1280, height=720):
 
 def getTrigger(ad: int, a: list, max: int = 1024) -> int:
     i = ad
-    while not (a[i] < 128 and not a[i + 2] < 128 or i - ad > max):
+    while not (safe_read(i,a) < 124 and safe_read(i,a+2) < 128 or i - ad > max):
         i += 1
     return i