AbcMarker— it's as easy as ABC

Features

Use any image or any text as a watermark. Change transparency, timing,
size and position of each watermark. Adjust the size, color, and font of the text.

Supported formats are avi, mpg, ts, vob, flv, or mkv.
AbcMarker supports the video codecs mpeg2, mpeg4, and flv).
Export uncompressed video for further encoding in other applications.

An easy-to-use interface. Working with the AbcMarker is very easy and quick.
Even a beginner can work with the application. You can view a «how to» video
or download the free demo version to see how easy it is.