Make MenuItem duration detection safer

minfo.py

@@ -63,17 +63,31 @@ class AudioInfo:
 
 
 class MenuItem:
+    TIME_RE = re.compile(r"(\d{2})[^\d]+(\d{2})[^\d]+(\d{2})(?:[^\d]+(\d+))")
     def __init__(self, *, start: str, duration: str, name: str):
         self.start = start
         self.duration = duration
         self.name = name
 
+    @property
+    def str_start(self) -> timedelta:
+        match = self.TIME_RE.search(self.start)
+        hours, minutes, seconds, millis = tuple(map(int, (match.group(i + 1) for i in range(4))))
+        return timedelta(hours=hours, minutes=minutes, seconds=seconds, milliseconds=millis)
+
+    def __str__(self) -> str:
+        return f"'{self.name}' at {self.str_start}, duration {self.duration}"
+
+    def __repr__(self) -> str:
+        return f"<MenuItem '{self.name}' at {self.start}, duration {self.duration}>"
+
 
 class MenuInfo:
     REGEX = re.compile(r"^_\d{2}_\d{2}_\d{2}")
 
-    def __init__(self, menu_dict: Dict[str, str]):
+    def __init__(self, menu_dict: Dict[str, str], duration: str = None):
         self.data = menu_dict
+        self.duration: Optional[float] = timeparse(duration) if duration else None
 
     @property
     def items(self) -> List[MenuItem]:
@@ -100,7 +114,7 @@ class MenuInfo:
                 result[-1].duration = duration
             result.append(MenuItem(start=key, duration="", name=name))
         if result:
-            td = timedelta(seconds=float(self.data["Duration"]))
+            td = timedelta(seconds=float(self.data.get("Duration", self.duration)))
             dur_td = timedelta(seconds=round((td - td0).total_seconds()))
             duration = str(dur_td)
             duration = f"{duration:0>8}"
@@ -227,4 +241,4 @@ class MediaInfo:
 
     @property
     def menu(self) -> MenuInfo:
-        return MenuInfo(self.menu_data or { self.duration: "Chapter 1" })
+        return MenuInfo(self.menu_data or { self.duration: "Chapter 1" }, duration=self.duration)