Suggestion for smaller file size with good quality

[kagsundaram]

@Austin

B-frames … Talking head footage, not so much, because so little is changing between frames.

Thanks.
This clearly explains my results. (It was talking-head footage.)

@Austin

GOP … file size reduction from 150 to 250 is generally very small

It must vary with the video image type, motion etc. I got a very significant size reduction by increasing GOP on talking-head footage.