Add "go to next interesting frame" button

croppa/main.py

@@ -871,6 +871,15 @@ class VideoEditor:
         # Template matching modes
         self.template_matching_full_frame = False  # Toggle for full frame vs cropped template matching
 
+        # Frame difference for interesting point detection
+        self.frame_difference_threshold = 10.0  # Percentage threshold for frame difference (10% default)
+        self.frame_difference_gap = 10  # Number of frames between comparisons (default 10)
+
+        # Search state for interesting point detection
+        self.searching_interesting_point = False
+        self.search_progress_text = ""
+        self.search_progress_percent = 0.0
+
         # Project view mode
         self.project_view_mode = False
         self.project_view = None
@@ -918,6 +927,8 @@ class VideoEditor:
                 'tracking_points': {str(k): v for k, v in self.tracking_points.items()},
                 'feature_tracker': self.feature_tracker.get_state_dict(),
                 'template_matching_full_frame': self.template_matching_full_frame,
+                'frame_difference_threshold': self.frame_difference_threshold,
+                'frame_difference_gap': self.frame_difference_gap,
                 'templates': [{
                     'start_frame': start_frame,
                     'region': region
@@ -1012,6 +1023,16 @@ class VideoEditor:
             # Load template matching state
             if 'template_matching_full_frame' in state:
                 self.template_matching_full_frame = state['template_matching_full_frame']
+
+            # Load frame difference threshold
+            if 'frame_difference_threshold' in state:
+                self.frame_difference_threshold = state['frame_difference_threshold']
+                print(f"Loaded frame difference threshold: {self.frame_difference_threshold:.1f}%")
+
+            # Load frame difference gap
+            if 'frame_difference_gap' in state:
+                self.frame_difference_gap = state['frame_difference_gap']
+                print(f"Loaded frame difference gap: {self.frame_difference_gap} frames")
             
             # Load simple templates state
             if 'templates' in state:
@@ -1465,6 +1486,116 @@ class VideoEditor:
         print(f"DEBUG: Jump next tracking to last marker from {current} -> {target}; tracking_frames={tracking_frames}")
         self.seek_to_frame(target)
 
+    def go_to_next_interesting_point(self):
+        """Go to the next frame where the difference from the previous frame exceeds the threshold"""
+        if self.is_image_mode:
+            return
+
+        self.stop_auto_repeat_seek()
+
+        if self.current_frame >= self.total_frames - 1:
+            print("Already at last frame")
+            return
+
+        # Store current frame for comparison
+        current_frame_backup = self.current_frame
+        current_display_frame = self.current_display_frame.copy() if self.current_display_frame is not None else None
+
+        print(f"Searching for next interesting point from frame {current_frame_backup + 1} with threshold {self.frame_difference_threshold:.1f}% (gap: {self.frame_difference_gap} frames)")
+
+        # Start searching from the next frame
+        target_frame = current_frame_backup + 1
+        search_cancelled = False
+        frames_checked = 0
+        total_frames_to_check = self.total_frames - target_frame
+
+        # Enable search mode for OSD display
+        self.searching_interesting_point = True
+
+        # Fast search using N-frame gap comparisons
+        try:
+            # Performance optimization: sample frames for faster processing
+            sample_size = (320, 240)  # Small sample size for fast difference calculation
+            update_interval = 10  # Update OSD every 10 comparisons
+
+            # Read the first frame to start comparisons
+            self.cap.cap.set(cv2.CAP_PROP_POS_FRAMES, current_frame_backup)
+            ret, base_frame = self.cap.cap.read()
+            if not ret:
+                search_cancelled = True
+                raise Exception("Could not read base frame")
+
+            base_frame_num = current_frame_backup
+
+            while target_frame < self.total_frames:
+                # Check for cancellation key (less frequent checks for speed)
+                if target_frame % 10 == 0:
+                    key = cv2.waitKey(1) & 0xFF
+                    if key == ord(";"):
+                        search_cancelled = True
+                        print("Search cancelled")
+                        break
+
+                # Read comparison frame that's N frames ahead
+                comparison_frame_num = min(target_frame + self.frame_difference_gap, self.total_frames - 1)
+                self.cap.cap.set(cv2.CAP_PROP_POS_FRAMES, comparison_frame_num)
+                ret, comparison_frame = self.cap.cap.read()
+                if not ret:
+                    break
+
+                frames_checked += 1
+
+                # Fast difference calculation using downsampled frames
+                base_small = cv2.resize(base_frame, sample_size)
+                comparison_small = cv2.resize(comparison_frame, sample_size)
+
+                # Calculate frame difference between frames N apart
+                diff_percentage = self.calculate_frame_difference(base_small, comparison_small)
+
+                # Update OSD less frequently for speed
+                if frames_checked % update_interval == 0 or diff_percentage >= self.frame_difference_threshold:
+                    progress_percent = (frames_checked / max(1, (self.total_frames - current_frame_backup) // self.frame_difference_gap)) * 100
+                    self.search_progress_percent = progress_percent
+                    self.search_progress_text = f"Gap search: {base_frame_num}↔{comparison_frame_num} ({diff_percentage:.1f}% change, gap: {self.frame_difference_gap}) - Press ; to cancel"
+
+                    # Force display update to show search progress
+                    self.display_needs_update = True
+                    self.display_current_frame()
+
+                # Check if difference exceeds threshold
+                if diff_percentage >= self.frame_difference_threshold:
+                    # Re-calculate with full resolution for accuracy
+                    full_diff = self.calculate_frame_difference(base_frame, comparison_frame)
+                    print(f"Found interesting point between frames {base_frame_num} and {comparison_frame_num} ({full_diff:.1f}% change)")
+                    self.show_feedback_message(f"Interesting: {full_diff:.1f}% change over {self.frame_difference_gap} frames")
+
+                    # Go to the later frame in the comparison
+                    self.current_frame = comparison_frame_num
+                    self.current_display_frame = comparison_frame
+                    break
+
+                # Move base frame forward for next comparison
+                target_frame += self.frame_difference_gap
+                base_frame_num = target_frame
+                base_frame = comparison_frame.copy() if comparison_frame is not None else None
+
+        except Exception as e:
+            print(f"Error during search: {e}")
+            search_cancelled = True
+
+        # Disable search mode
+        self.searching_interesting_point = False
+        self.search_progress_text = ""
+
+        # If no interesting point found or search was cancelled, go back to original frame
+        if search_cancelled:
+            self.seek_to_frame(current_frame_backup)
+            self.show_feedback_message("Search cancelled")
+        elif target_frame >= self.total_frames:
+            print(f"No interesting point found within threshold in remaining frames")
+            self.seek_to_frame(current_frame_backup)
+            self.show_feedback_message("No interesting point found")
+
     def _get_previous_tracking_point(self):
         """Get the tracking point from the previous frame that has tracking points."""
         if self.is_image_mode or not self.tracking_points:
@@ -1613,6 +1744,48 @@ class VideoEditor:
 
         return processed_frame
 
+    def calculate_frame_difference(self, frame1, frame2) -> float:
+        """Calculate percentage difference between two frames"""
+        if frame1 is None or frame2 is None:
+            return 0.0
+
+        try:
+            # Ensure frames are the same size
+            if frame1.shape != frame2.shape:
+                # Resize frame2 to match frame1
+                frame2 = cv2.resize(frame2, (frame1.shape[1], frame1.shape[0]))
+
+            # Convert to grayscale for difference calculation
+            if len(frame1.shape) == 3:
+                gray1 = cv2.cvtColor(frame1, cv2.COLOR_BGR2GRAY)
+            else:
+                gray1 = frame1
+
+            if len(frame2.shape) == 3:
+                gray2 = cv2.cvtColor(frame2, cv2.COLOR_BGR2GRAY)
+            else:
+                gray2 = frame2
+
+            # Calculate absolute difference
+            diff = cv2.absdiff(gray1, gray2)
+
+            # Calculate percentage of pixels that changed significantly
+            # Use threshold to ignore minor noise
+            _, thresh_diff = cv2.threshold(diff, 30, 255, cv2.THRESH_BINARY)
+
+            # Count changed pixels
+            changed_pixels = cv2.countNonZero(thresh_diff)
+            total_pixels = gray1.size
+
+            # Calculate percentage
+            difference_percentage = (changed_pixels / total_pixels) * 100.0
+
+            return difference_percentage
+
+        except Exception as e:
+            print(f"Error calculating frame difference: {e}")
+            return 0.0
+
     # --- Motion tracking helpers ---
     def _get_effective_crop_rect_for_frame(self, frame_number):
         """Return EFFECTIVE crop_rect in ROTATED frame coords for this frame (applies tracking follow)."""
@@ -2998,6 +3171,18 @@ class VideoEditor:
                     1,
                 )
 
+            # Draw frame difference threshold info
+            threshold_text = f"Interesting: {self.frame_difference_threshold:.0f}% (gap: {self.frame_difference_gap})"
+            cv2.putText(
+                frame,
+                threshold_text,
+                (bar_x_start, bar_y - 15),
+                cv2.FONT_HERSHEY_SIMPLEX,
+                0.4,
+                (200, 200, 200),
+                1,
+            )
+
     def display_current_frame(self):
         """Display the current frame with all overlays"""
         if self.current_display_frame is None:
@@ -3324,6 +3509,45 @@ class VideoEditor:
         # Draw feedback message (if visible)
         self.draw_feedback_message(canvas)
 
+        # Draw search progress (if searching for interesting point)
+        if self.searching_interesting_point and self.search_progress_text:
+            # Draw search progress overlay
+            height, width = canvas.shape[:2]
+
+            # Background for search progress
+            text_size = cv2.getTextSize(self.search_progress_text, cv2.FONT_HERSHEY_SIMPLEX, 0.6, 2)[0]
+            padding = 10
+            bg_x = (width - text_size[0]) // 2 - padding
+            bg_y = height // 2 - 50
+            bg_w = text_size[0] + 2 * padding
+            bg_h = 30
+
+            # Semi-transparent background
+            overlay = canvas.copy()
+            cv2.rectangle(overlay, (bg_x, bg_y), (bg_x + bg_w, bg_y + bg_h), (0, 0, 0), -1)
+            cv2.addWeighted(overlay, 0.7, canvas, 0.3, 0, canvas)
+
+            # Border
+            cv2.rectangle(canvas, (bg_x, bg_y), (bg_x + bg_w, bg_y + bg_h), (255, 255, 0), 2)
+
+            # Text
+            cv2.putText(canvas, self.search_progress_text, (bg_x + padding, bg_y + 20),
+                       cv2.FONT_HERSHEY_SIMPLEX, 0.6, (255, 255, 255), 2)
+
+            # Progress bar
+            bar_width = 200
+            bar_height = 6
+            bar_x = (width - bar_width) // 2
+            bar_y = bg_y + bg_h + 5
+
+            # Background
+            cv2.rectangle(canvas, (bar_x, bar_y), (bar_x + bar_width, bar_y + bar_height), (100, 100, 100), -1)
+
+            # Progress fill
+            fill_width = int(bar_width * (self.search_progress_percent / 100.0))
+            if fill_width > 0:
+                cv2.rectangle(canvas, (bar_x, bar_y), (bar_x + fill_width, bar_y + bar_height), (0, 255, 0), -1)
+
         window_title = "Image Editor" if self.is_image_mode else "Video Editor"
         cv2.imshow(window_title, canvas)
 
@@ -4519,6 +4743,25 @@ class VideoEditor:
                 if not self.is_image_mode and self.cut_end_frame is not None:
                     self.seek_to_frame(self.cut_end_frame)
                     print(f"Jumped to cut end marker at frame {self.cut_end_frame}")
+            elif key == ord(";"):  # ; - Go to next interesting point
+                if not self.is_image_mode:
+                    self.go_to_next_interesting_point()
+            elif key == ord("0"):  # 0 - Decrease frame difference threshold
+                self.frame_difference_threshold = max(1.0, self.frame_difference_threshold - 1.0)
+                print(f"Frame difference threshold: {self.frame_difference_threshold:.1f}%")
+                self.show_feedback_message(f"Threshold: {self.frame_difference_threshold:.1f}%")
+            elif key == ord("9"):  # 9 - Increase frame difference threshold
+                self.frame_difference_threshold = min(100.0, self.frame_difference_threshold + 1.0)
+                print(f"Frame difference threshold: {self.frame_difference_threshold:.1f}%")
+                self.show_feedback_message(f"Threshold: {self.frame_difference_threshold:.1f}%")
+            elif key == ord("7"):  # 7 - Decrease frame difference gap
+                self.frame_difference_gap = max(1, self.frame_difference_gap - 1)
+                print(f"Frame difference gap: {self.frame_difference_gap} frames")
+                self.show_feedback_message(f"Gap: {self.frame_difference_gap} frames")
+            elif key == ord("8"):  # 8 - Increase frame difference gap
+                self.frame_difference_gap = min(100, self.frame_difference_gap + 1)
+                print(f"Frame difference gap: {self.frame_difference_gap} frames")
+                self.show_feedback_message(f"Gap: {self.frame_difference_gap} frames")
             elif key == ord("N"):
                 if len(self.video_files) > 1:
                     self.previous_video()