Thank you for your reply! Yes, I thought it was something like that because I saw MPG2-DVD and Bluray and the resolution constraints would make sense. I believe it is the format that it accepted by the Planetarium software, but perhaps there are other formats that are acceptable that I am unaware of.
However, I was asked to export MPG2 so I’m trying to find a workaround.
For now, I have exported H.264 MP4 then using a convertor to change the files into MP2… not sure if that’s very effective or efficient.
I hope Adobe makes a stand alone batch rendering software… I guess Encoder is supposed to work like that.