pI works in square pixels only, so you need to set up your project with the right aspect ratio first.
Press ALT+P for the Project dialog box.
Change your Frame Rate to 25.
Change your Stage Size to 1024 x 576.
I know the resolution of 1024x576.
But when i import my video file its just 720x576 and doesn´t fit my stage size.
Si i can´t use any effects, because they don´t match my 16:9 footage (or i have to stretch them) ...