: For MP4 files, the mp4v codec is widely used. You can define it using: fourcc = cv2.VideoWriter_fourcc(*'mp4v') .
When writing video features, developers often encounter specific issues documented on Stack Overflow : vid_522.mp4
cv2.VideoWriter fails to write *.mp4 video files #24787 - GitHub : For MP4 files, the mp4v codec is widely used
: This often occurs if the frame size passed to VideoWriter does not exactly match the actual dimensions of the frames being written. : For MP4 files