The encoding process works best if resolution in given in multitudes of 16. 270 is not divisable by 16, 272 is. Hence the correction. Likely you are much better off with 2 extra pixels vertically, but with much better quality.
Thanks for that, that's helpful. However, what is the best way to counteract this self adjust feature. For example, if we need a video at an unusual size which isn'd divisable by excatly 16, such as the before example or another sizing, what is the best way to remove these bars as I don't wish them to appear.
On past CS3 version of Premiere you were able to export to FLV at any given size, however unusual without any black bars.
Does anyone know of a way around this as it is not always possible for us to make the size exactly divisable by 16.