Hi
Personally, i'm using to add watermark on video a VideoCharge Studio.
Of couse, i know that exist lot of prorgrams which can do it as well, but i love a VideoCharge Studio

so this program has lot of functions very impotent for me.
for example, batch mode, command line, video editing sunction as split, join, ets...
so i recomend to look this software, i think you dont pity
here you can read as to
add watermark on video.