[HELP] how to crop left and right black bars, keep ratio aspect at the same time?

[ssdde]

i clicked preview, why is all black?

---

[quote pid="11064" dateline="1614616136"]
-> read https://en.wikipedia.org/wiki/Pixel_aspect_ratio until you understand why PAR does not change if you just crop.

Cu Selur
[/quote]

yeah, too professional, could i learn the steps in Hybrid first? and then study base knownledge in future. thanks please.