Hi Shane,
Many thanks for the quick reply and please excuse that I couldn’t replied earlier myself.
You’re right, ProRes is not 1440×1080, but I was told to set it like that when exporting and, to be honest, I’m not sure what use it is, as it’s exported anyway as 1920×1080 (will ask my colleague about it as soon as I get the chance). Somehow, it looks fine like that.
Thank you for the DNxHD tip, I will definitely pass it on.
Turns out the solution was as easy as changing the geometry settings in Compressor to the mentioned 1440×1080, and it was fine. Although next time, I will try leaving both ProRes and the H.264 conversion to 1920×1080 to see how it looks like.
Again, thank you very much!