title: How to Watermark videos with FFMPEG commands
body: <p>i need to watermark a video file.
  i have FF-MPEG Linux server and ff-mpeg is installed by default
  plz reply me the command of watermarking for below details
  1. The source file is Input.mp4
  2. the Target file is Output.mp4
  3. the watermark file Watermark.png</p>
  
  <p>please send me the Linux commands.
  is there anyone know, please reply soon</p>