Been doing some more googling. Discovered that the letter suffixes after the camera resolutions in the camera mode window refer to camera codecs YUY2, IYUV, and I420. The YUY2 codec is newer and so I'll use 640x480 (YUY2).
Quote:
choose the YUY2 codec, which delivers a higher quality image (and a larger file for the same amount of data).
A 100 frame AVI at 640x480 is about 65Mb with the YUY2 codec, compared to 45Mb with I420 or IYUV.
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