fix tests

src/scenechange/mod.rs

@@ -136,11 +136,6 @@ impl<T: Pixel> SceneChangeDetector<T> {
       return false;
     }
 
-    // Decrease deque offset if there is no more new frames
-    if self.deque_offset > frame_set.len() + 1 && self.lookahead_offset > 0 {
-      self.deque_offset = self.deque_offset - 1;
-    }
-
     // Initially fill score deque with forward frames
     // ititiallization is different depending on frame set length
     if self.deque_offset > 0
@@ -164,13 +159,16 @@ impl<T: Pixel> SceneChangeDetector<T> {
       self.deque_offset = frame_set.len() - 2;
     }
     // Running single frame comparison and adding it to deque
+    // Decrease deque offset if there is no new frames
     if frame_set.len() > self.deque_offset + 1 {
       self.run_comparison(
         frame_set[self.deque_offset].clone(),
         frame_set[self.deque_offset + 1].clone(),
         input_frameno,
         previous_keyframe,
       );
+    } else {
+      self.deque_offset -= 1;
     }
 
     // Adaptive scenecut check
@@ -237,12 +235,6 @@ impl<T: Pixel> SceneChangeDetector<T> {
     let mut cloned_deque = self.score_deque.to_vec();
     cloned_deque.remove(self.deque_offset);
 
-    let max_of_deque: f64 = cloned_deque
-      .iter()
-      .cloned()
-      .map(|(b, _)| b)
-      .fold(-1. / 0. /* -inf */, f64::max);
-
     let scene_score = self.score_deque[self.deque_offset].0;
     let scene_threshold = self.score_deque[self.deque_offset].1;
 
@@ -261,6 +253,7 @@ impl<T: Pixel> SceneChangeDetector<T> {
       if !back_over_tr.is_empty()
         && forward_over_tr.is_empty()
         && back_deque.len() > 1
+        && back_over_tr.len() > 1
       {
         return true;
       }
@@ -274,14 +267,13 @@ impl<T: Pixel> SceneChangeDetector<T> {
       {
         return true;
       }
+
+      if !back_over_tr.is_empty() || !forward_over_tr.is_empty() {
+        return false;
+      }
     }
 
-    let threshold = if self.fast_mode {
-      self.threshold as f64 + max_of_deque
-    } else {
-      scene_threshold
-    };
-    scene_score >= threshold
+    scene_score >= scene_threshold
   }
 
   /// The fast algorithm detects fast cuts using a raw difference