Lay the ribs on the top rack of the grill (away from the coals, if you're using briquettes). Reduce gas heat to low, close lid, and leave undisturbed for 1 hour. Do not lift the lid at all. Brush ribs with barbecue sauce, and grill an additional 5 minutes.
You can store about 27 hours and 30 minutes of video on a 64gb memory card.
The number of hours of video that a 16 gb card can hold depends on the quality of the video and consequently the size of the videos. If it is an hd video, then it will take relatively more space. Normally a one hou video takes 1.5 gb of space so a 16 gb card can then hold around 10 hours of video.