Watermark video with ffmpeg

I want watermark video with text or image to protect my video copyright.

What i have:

  • video file: abc.mp4 (located at /home/user/abc.mp4)
  • image file: cde.png (located at /home/user/cde.png)

How can i watermark my video file with image? Does anyone success watermark video on Dreamhost shared hosting?

If yes, please give me ssh command !

Many thanks for great help!