This is the relative height/width that the final video should be played back at.
Non-widescreen Standard Definition TV is 4:3, Widescreen and High Definition TV are 16:9.
Movies vary quite a bit, from very old movies in 4:3, older movies in the Academy standard of 11:8, others in 1.85:1 or 2.40:1, and there were a wide variety of other widescreen movie aspect ratios.
Same as Source means the program will read the original video and use that aspect ratio.
You will sometimes see 1:1 or Square pixels listed. This means that the aspect ratio is proportional to the number of pixels in each direction. this is generally correct for video to be watched on a modern computer (you should resize the video to be proportional to the video's actual aspect ratio if needed.)
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