ALL4: don't extract pre-roll (0:00:00) ads as a chapter

so we don't get dupes if the intro chapter is at 0ms
core still sets a chapter at 0:00:00 no matter what, so it's fine™

services/ALL4/__init__.py

@@ -267,13 +267,31 @@ class ALL4(Service):
     def get_chapters(self, title: Union[Movie, Episode]) -> list[Chapter]:
         track = title.tracks.videos[0]
 
-        chapters = [
-            Chapter(
-                name=f"Chapter {i + 1:02}",
-                timestamp=datetime.fromtimestamp((ms / 1000), tz=timezone.utc).strftime("%H:%M:%S.%f")[:-3],
+        chapters = []
+
+        for x in track.data["adverts"]["breaks"]:
+            ms = x.get("breakOffset")
+            if ms != 0:
+                chapters.append(Chapter(
+                    timestamp=datetime.fromtimestamp((ms / 1000), tz=timezone.utc).strftime("%H:%M:%S.%f")[:-3],
+                ))
+
+        if intro_data := track.data.get("skipIntro"):
+            chapters.append(
+                Chapter(
+                    name="Intro",
+                    timestamp=datetime.fromtimestamp(
+                        (intro_data["skipStart"] / 1000), tz=timezone.utc
+                    ).strftime("%H:%M:%S.%f")[:-3],
+                )
+            )
+            chapters.append(
+                Chapter(
+                    timestamp=datetime.fromtimestamp(
+                        (intro_data["skipEnd"] / 1000), tz=timezone.utc
+                    ).strftime("%H:%M:%S.%f")[:-3],
+                )
             )
-            for i, ms in enumerate(x["breakOffset"] for x in track.data["adverts"]["breaks"])
-        ]
 
         if track.data.get("endCredits", {}).get("squeezeIn"):
             chapters.append(
@@ -284,8 +302,7 @@ class ALL4(Service):
                     ).strftime("%H:%M:%S.%f")[:-3],
                 )
             )
-
-        return chapters
+        return sorted(chapters, key=lambda x: x.timestamp)
 
     def get_widevine_service_certificate(self, **_: Any) -> str:
         return WidevineCdm.common_privacy_cert