☕TL;DR The Auto Aspect Ratio is determined either by the Aspect Ratio of the the first video added to the Timeline or by the dimensions of whichever video has the smallest black bar region, once black bars have been removed.
☕TL;DR The Auto Aspect Ratio is determined either by the Aspect Ratio of the the first video added to the Timeline or by the dimensions of whichever video has the smallest black bar region, once black bars have been removed.