Changing data rate doesn't work!

i'm trying find balance between quality , file size on video files in ogv format mp4 format.

sending ae (i've tried outputting intermediate file no change) on test clip , applying different render settings in encoder.

 

when keeping other settings same (frame size, cbr/vbr, audio settings....) , changing only data rate, encoder creating identical sized (and quality)  file. since same source, data rate not changing or file size.

 

this happening both ogv (theora) renders , h.264 mp4 renders. "expected file size" changes, once file created creates file size matches original settings.

if change frame size data rate changes, want consistent frame size, test different data rates.

i've reinstalled app on desktop, , attempted same process on laptop same results.

what missing?

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