That is helpful! I kinda wish Mediainfo was a little smarter and understood that the aspect ratios being written differently really meant the same thing. I opened one of the files in Mediainfo in debug mode and saw the details: there are now two lines that say "original aspect ratio" and two for "display aspect ratio". "Original" says 4:3 and 1.334, "Display" says 4:3 and 1.333. So one is being displayed rounded which seems to be the difference... ok. So I guess when the sar 8:9 is written in the stream, it gets rounded and when it's the one in the container it's not. Well I guess there really is nothing to worry about then.
