ffmpeg docker image with php

i have used ffmpeg a lot in [login to view URL] a torrent download and then streaming website but now a days its down. luckily it was also hosted on ubuntu 14.04. I created 3 minutes clips from videos as well for free users etc. bellow one is sample command from that source. $cmd = "/usr/bin/ffmpeg $cliptimestart -y -i \"".$source."\" $cliptimeend \"".$destination."\" < /dev/null 2>&1";

I will do this task and will create image from mp4 video. I have strong knowledge of the docker and PHP web development. thanks