What’s the spec on the Mac book pro?
Bobs right.
But still….
Your asking your laptop to capture via matrox box > compress to prores HQ + at the same time send data down gig-e to your macpro.
Funny other pro res works.
Uncompressed 8 bit does probably as the CPU hasn’t got a load of compressing to do so has the capacity to handle the network sending
Open up activity monitor
Check your CPU usage when you capture diff codecs. Might get an idea of what’s pushing it and what’s not.
Si