Program fails to execute after startx. Why?

Question

I'm using Raspbian Jessie Lite as the OS for RPi 3. This OS does not have X11 by default, so I installed xserver-xorg and xinit manually.

I want to play a movie or display a picture after startx. So I edit ~/.xinitrc file as the following:

feh /home/pi/mypicture.jpg

This works perfectly fine; Every time I execute startx on command line, it starts to display the picture.

However, when I edit the ~/.xinitrc as the following:

omxplayer /home/pi/myvideo.mp4

unfortunately, after executing startx, it does not play video. Using ssh, the top says that omxplayer and omxplayer.bin are stopped.

So, how can I execute omxplayer right after startx !?