how to watermark uploaded videos?

[fatrat]

I would like my website to add a watermark to uploaded video files.

How is this done?

ie: http://ebaumsworld.com/2007/01/heroin-christmas.html

[Majglow]

http://ffmpeg.mplayerhq.hu/

or you can use any video editing program and edit them by hand.

[fatrat]

i want them to be done by the server, same as u can use the gd library to do images.