Yesterday, I tried something new for me in TMPgenc:
I select "clip frame" and set the setting to 16,16,16,16 for bottom/top/left/right and also click on the mask button for all of those.
I got the result as I wanted except two issues:
1) the conversion time takes about 3 times longer
2) some video clips are encoded with sound having very low volume

Does anyone have an idea about these two problems.