This has been an issue with Deforum as far back as I can remember... If the proportion was too wide, things would stretch unnaturally vertically, and if proportion was too thin, things would stretch horizontally.
I found that changing the aspect ratio in this function to 1, things are always correct, no matter the proportion of the image!
This is a major change to Deforum, but in all of my tests the results are much more consistent and reliable. I've tested extremes, like 3:1, 1:3, 4:1, 1:4, and everything seems even now. Tested different depth setings and FOV, and it all seems right to me now.
loading old setting file work properly:
WARNING: Setting 'flip_2d_perspective' has been renamed to 'enable_perspective_flip'. The saved settings file will reflect the change
Changed the way that vid2frames reports problems
vid2frames addresses pathing errors
vid2frames checks if setting are changed.
vid2frames has input name + frame#