This is a pretty simple node that will output an int of width and height for easy piping to a sampler, after selecting an aspect ratio from a dropdown menu.

PRs welcome for additional video resolutions!

Setup is pretty simple:

Below are the current resolutions.

"256x256 (1:1)",
"256x384 (2:3)",
"384x256 (3:2)",
"320x448 (5:7)",
"448x320 (7:5)",
"384x512 (3:4)",
"512x384 (4:3)",
"512x512 (1:1)",
"512x768 (2:3)",
"768x512 (3:2)",
"512x640 (4:5)",
"640x512 (5:4)",
"448x768 (9:16)",
"768x448 (16:9)",
"576x1024 (9:16)",
"704x1408 (1:2)",
"704x1344 (13:25)",
"768x1344 (4:7)",
"768x1280 (3:5)",
"832x1216 (2:3)",
"832x1152 (5:7)",
"896x1152 (7:9)",
"896x1088 (4:5)",
"960x1088 (8:9)",
"960x1024 (15:16)",
"1024x1024 (1:1)",
"1024x960 (16:15)",
"1088x960 (9:8)",
"1088x896 (5:4)",
"1152x896 (9:7)",
"1152x832 (7:5)",
"1216x832 (3:2)",
"1280x768 (5:3)",
"1344x768 (7:4)",
"1344x704 (16:9)",
"1024x576 (16:9)",
"1408x704 (2:1)",
"1472x704 (21:10)",
"1536x640 (12:5)",
"1600x640 (5:2)",
"1664x576 (3:1)",
"1728x576 (3:1)"