Write FFMPEG script to add watermark to video

Job ID: 34099852

Budget: $30 – $250 USD

Hi I have an mp4 video as input, and I need to generate several versions of this video, each with a separate watermark burnt on it. The watermark should consist of a sentence with a fixed part and a variable part.
For instance the text would be "This is video for country X" where the variable part would be the X where I could specify a country name to replace the X in the text.
I should be able to specify the font (size, color, transparency level), and where on the video the watermark is located (top, bottom, left, right), also the watermark should be able to move (for instance scroll from left to right as the video progresses)
Related categories: Scripting