Add video validation and flexible column detection to MediaPipe processing

- Add video file validation to prevent repeated processing of invalid videos
- Support both START/END and START_REALIGNED/END_REALIGNED timestamp columns
- Implement video validation caching to avoid duplicate checks
- Add comprehensive task summary logging with skip reasons
- Translate Chinese comments to English
- Add proper resource cleanup and memory management
- Fix 60-second duration filtering implementation

This eliminates repeated error messages for missing/corrupted videos and improves processing efficiency.

Author: root

.gitignore

@@ -158,5 +158,11 @@ cython_debug/
 #  be found at https://github.com/github/gitignore/blob/main/Global/JetBrains.gitignore
 #  and can be added to the global gitignore or merged into this file.  For a more nuclear
 #  option (not recommended) you can uncomment the following to ignore the entire idea folder.
-#.idea/
+.idea/
+
+# Claude
+.claude/
+
+# data
+dataset
 

requirements.txt

@@ -4,4 +4,5 @@ tqdm
 numpy
 pandas
 opencv-python
-mediapipe
+mediapipe
+psutil