Vegas Pro 19
I have been editing some online lessons to remove rubbish at the start, they are 1 hour lessons, the original is 1920x1040 25fps, the total bitrate is 922kbps, file size 394MB. I have chosen HDV 720-25p (1280x720, 25.000 fps) as I don't want it filling the screen when reviewing the lesson as I have a document open to make notes. the problem is that the total bitrate has increased from 427kbps in May to 4068kbps in June and is now 6700kbps, the file sizes have gone from 176MB to 1.52GB to 2.76GB.
How to I set the total bitrate?