fps not always retrieved successfully on Linux -> set to 30 if needed

Sports2D/Sports2D.py

@@ -270,15 +270,14 @@ def base_params(config_dict):
         # frame_rates
         frame_rates = []
         for video_file in video_files:
-            print(str(video_dir / video_file))
             video = cv2.VideoCapture(str(video_dir / video_file))
+            if not video.isOpened():
+                raise FileNotFoundError(f'Error: Could not open {video_dir/video_file}. Check that the file exists.')
             frame_rate = video.get(cv2.CAP_PROP_FPS)
-            try:
-                1/frame_rate
-                frame_rates.append(frame_rate)
-            except ZeroDivisionError:
-                print('Frame rate could not be retrieved: check that your video exists at the correct path')
-                raise
+            if frame_rate == 0:
+                frame_rate = 30
+                logging.warning(f'Error: Could not retrieve frame rate from {video_dir/video_file}. Defaulting to 30fps.')
+            frame_rates.append(frame_rate)
             video.release()
 
         # time_ranges

Sports2D/process.py

@@ -160,6 +160,8 @@ def setup_webcam(webcam_id, save_vid, vid_output_path, input_size):
     out_vid = None
     if save_vid:
         fps = cap.get(cv2.CAP_PROP_FPS)
+        if frame_rate == 0:
+            frame_rate = 30
         # fourcc MJPG produces very large files but is faster. If it is too slow, consider using it and then converting the video to h264
         # try:
         #     fourcc = cv2.VideoWriter_fourcc(*'avc1') # =h264. better compression and quality but may fail on some systems
@@ -206,6 +208,8 @@ def setup_video(video_file_path, save_vid, vid_output_path):
     out_vid = None
     if save_vid:
         fps = cap.get(cv2.CAP_PROP_FPS)
+        if frame_rate == 0:
+            frame_rate = 30
         # try:
         #     fourcc = cv2.VideoWriter_fourcc(*'avc1') # =h264. better compression and quality but may fail on some systems
         #     out_vid = cv2.VideoWriter(vid_output_path, fourcc, fps, (cam_width, cam_height))