[FFmpeg-user] How to pan hozitonally on a video?

[Sub Phil]

RE:https://www.ffmpeg.org/ffmpeg-filters.html#zoompan

Hi,

I have a 30 sec video in 1920x1080 at 25fps

I want to pan/crop with a constant rectangle of 1200x980

It rectangle starts at position (0,0) till t=10 sec
than from t=10 sec to t=20sec I wish my rectangle to move at a
constant/linear speed from position (0,0) to (400,10)

Than from t=20 sec onwards, rectangle stays at (400,10).

How can I do that??

Thanks