I create a php script that download videos (mass and one by one) and then watermark them and move it do another folder.
Is very simple to use...
First download video from various sources or manually add videos to /videos folder
Then just click watermark and that it.
All videos inside /videos will be watermarked and ready to upload to your site or to other sites to get some traffic.
Some very useful feature is that have option to join to final result intro video.
Contact me for more information : email@example.com