ATR
Your calculations are correct.
Wel the output file is 76GB (XAVC-S version) so the voorsight in the advanged folder is a bit of. (bitrate Mpeg 24073Kbps data speed= 23916Kbps)
(Source:)Total bitrate Avi:3003Kbps, dataspeed 2683Kbps
So in the renderingproces its almost multipy by 9 in bit rate. (thats explains the expanded filesize) but how can i get 1280x720p (3003Kbps) output generated?
Edit: did some test with powerdirector 11 and created a MPEG4 1280x720 datarate 8032Kbps total bitrate: 8224Kbps "only" 25,9Gb. (2 1/2 times source)
Is there a program that just can past/stich all the AVI's to one AVI? (Without rendering and recoding?)