[detectors] Fix not compensating for filter buffer length

scenedetect/detectors/content_detector.py

@@ -234,3 +234,7 @@ def _detect_edges(self, lum: numpy.ndarray) -> numpy.ndarray:
         # camera movement. Note that very large kernel sizes can negatively affect accuracy.
         edges = cv2.Canny(lum, low, high)
         return cv2.dilate(edges, self._kernel)
+
+    @property
+    def event_buffer_length(self) -> int:
+        return self._flash_filter.max_behind

scenedetect/scene_detector.py

@@ -172,7 +172,12 @@ def __init__(self, mode: Mode, length: int):
         self._last_above = None  # Last frame above threshold.
         self._merge_enabled = False  # Used to disable merging until at least one cut was found.
         self._merge_triggered = False  # True when the merge filter is active.
-        self._merge_start = None  # Frame number where we started the merge filte.
+        self._merge_start = None  # Frame number where we started the merge filter.
+
+    @property
+    def max_behind(self) -> int:
+        """Maximum number of frames a filtered cut can be behind the current frame."""
+        return 0 if self._mode == FlashFilter.Mode.SUPPRESS else self._filter_length
 
     def filter(self, frame_num: int, above_threshold: bool) -> ty.List[int]:
         if not self._filter_length > 0:

website/pages/changelog.md

@@ -589,4 +589,5 @@ Development
 ## PySceneDetect 0.6.5 (TBD)
 
  - [bugfix] Fix new detectors not working with `default-detector` config option
- - [bugfix] Fix SyntaxWarning due to incorrect escaping [#400](https://github.com/Breakthrough/PySceneDetect/issues/400)
+ - [bugfix] Fix `SyntaxWarning` due to incorrect escaping [#400](https://github.com/Breakthrough/PySceneDetect/issues/400)
+ - [bugfix] Fix `ContentDetector` crash when using callbacks [#416](https://github.com/Breakthrough/PySceneDetect/issues/416)