- QSpinBox’s up/down buttons is overkill for Resolution, Aspect ratio and Frames/sec. I can’t imagine case when user use it. I suggest to remove its.
- I also think that for Resolution (and Aspect ratio) not spitted textbox is more convenient, I means not 1 textbox for Width and 1 textbox for Height but the only 1 textbox with numbers and symbol x like 1920x1080. It helps to copy-past settings!