Same video project with same config exported with different size

[rheneaschoi]

I have exported the same VideoStudio project 3 times using the same config (MP4 3840x2160 HEVC 40Mbps). But the file size of the exported videos are different. Anyone know why?

[Ken Berry]

My guess is that it is because mp4 (like all mpeg formats) is a lossy format. So each time you process it, it loses a small amount of quality. Given the small amounts in this case, I doubt that you would see any quality differences between the three videos on screen.

[canuck]

The properties show a different bit rate in each case - variable bit rate set?

[rheneaschoi]

My guess is that it is because mp4 (like all mpeg formats) is a lossy format. So each time you process it, it loses a small amount of quality. Given the small amounts in this case, I doubt that you would see any quality differences between the three videos on screen.

I cannot see any quality differences between them.

[rheneaschoi]

The properties show a different bit rate in each case - variable bit rate set?

Not variable bit rate, it is fixed 40Mbps