Subtitle under or outside the Video frame/borrder/screen Not Working with video-align and video scale

without the video-scale and video-align option the simple --sub-pos=115 would suffice

but with my setup:

--video-scale-x=0.43
--video-scale-y=0.43
--video-align-x=1
	# left right
--video-align-y=0.40
	# top bottom

as you can see it's off-centered but, with:

--sub-use-margins=no

it's 'centered now but i wanted the subs to be under or outside the video frame let's try:

--sub-pos=115

as you can see, it's cut off. and if i put sub-pos=125 or above, the subs would be even further below rendering it as invisible.

so i tried this instead:

---sub-align-x=right
---sub-align-y=bottom

or

---sub-align-x=right
--sub-margin-y=60
	# vertical

or

--sub-align-x=right
 --sub-pos=115

results:

as you can see it is "centered", but it can't handle long subtitle. i even mess with the sub-justify=, but no luck. I suspect

--sub-margin-x=size
	# horizontal

would fix it but it does not work. no visual difference

this is my desired results:

'centered' and can handle and wrap subtitle.

Reproduce the subtitle placement with video-scale-x/y, video-align-x/y, sub-pos, sub-use-margins, sub-align-x/y, sub-margin-y, and sub-justify using the configurations and screenshots in the issue. Trace how scaled video geometry and subtitle margins interact, then verify that centered subtitles remain visible, wrap long lines, and can render below the video frame.