[fpc-pascal] How to play H264 mp4 video using free pascal?

[Dennis Poon]

what library (e.g. ffmpeg) should I call?
any example e.g. of it?

Actually, the target platform is Raspberry Pi (raspbian OS). It comes 
with a video player that does it (omxplayer) but I don't know how to 
interface with it apart from launching it.
After launch, I don't know how to pause it from my free pascal program.

The goal is to have my program play an advertisement video as a screen 
saver. When someone touches the mouse or keyboard, the video pause and 
return to my program.

Thanks in advance.

Dennis