Thanks - that worked. You get the BTC, please let me know where I should send it.
I must say this was really frustrating. What is the difference between global parameters and inline parameters?
you can send it here: 16F8HVS9Kns4GymHa5VRUSQFaD9pt7piXm
https://libav.org/avconv.html#SynopsisThe generic syntax is: avconv [global options] [[infile options][‘-i’ infile]]... {[outfile options] outfile}...
Well, probably global parameters apply to all, infile (not inline sorry for confusion) or outfile options are local or predefined. When you choose -r 30 and video.mp4, it overrules 30 fps because of *.mp4 (I presume).
edit: thanks for the payment dude.