Presently disclosed are systems and method for identifying a video aspect-ratio frame attribute of a current frame. One example embodiment takes the form of a method including: (i) receiving the current frame; (ii) defining a region of the current frame, the defined region having a plurality of lumas within a luma range; (iii) calculating a non-black luma percentage of the region based on the lumas; (iv) calculating an average luma of the region based on the lumas; and (v) identifying the current frame as having a standard video aspect-ratio attribute responsive to (a) the average luma being less than a max-black luma threshold and (b) the non-black luma percentage being less than a non-black luma percentage threshold.