I have a simple, automated process to convert video using the H.264 MP4 codec type. To watch them on my smart phone, I had been using the iPhone preset (I think 420 pixels wide) but recently switched to another preset (720 pixels wide). My device is actually 800 pixels wide. The most noticeable difference is the resultant increase in file size. I'm not terribly concerned with video quality, and frankly don't really notice much difference between the two. Which preset is easier on my device? The narrower video has to be stretched by my media player to fill the screen, while the wider video does not. Does the processor work less if it doesn't need to stretch the video, or does greater resolution tax the processor more? The difference probably isn't a whole lot, so I'm mainly asking out of curiosity. Anyone know the answer? Thanks!