Sorry for not getting back to you sooner – I didn’t see your reply.
No, as I said, you’d have to modify the appropriate PWM period register (PWM1PR, for example). Different PWM pins use different PWM modules, so to answer your question about whether you can have different pins with different periods, it really depends on which PWM pins you’re using and which PWM modules they’re hooked up to internally. You’d have to consult the STM32F4 reference manual for that information.
For what it’s worth, when I hear that someone wants to PWM something with a period of 1 Hz, that’s usually a red flag. There’s probably a better way of doing whatever it is you’re trying to do.
Can you tell us more about your application?