Need to verify Youtube Video is playing

What about taking few screenshots of the area where video is playing and then comparing them? If there is a difference between the 2 screenshots, probably the video is playing..

@Eugene
Yes this might work, but not always (still phases !?)

This is my solution:
watching the elapsed time display in the control bar and looking for the capture 1.1 seconds before.
Should change while running.

This works for me: (used version 1.0.1)

The lines starting with #dev# I used while developing the script

switchApp("Safari")
top = find("top-left-youtube-logo.png")

# to eval the relative position of the elapsed time display
#dev# highlight(-2)
#dev# r = selectRegion()
#dev# print r, r.x-top.x, r.y-top.y

# elapsed time display
# values might have to be adjusted depending on your top capture
time = Region(top.x+225, top.y+426, 40,20)
# make control bar visible
time.hover()
wait(1)

pause = "button-pause.png"
play = "button-play.png"
button = time.left(30).grow(5)
#dev# button.highlight(2)

# switch to play, if not playing
if button.exists(play, 0):
    button.click()

# show, we started to watch
hover(button.leftAt(20))
while True:
    lastTime = capture(time)
    wait(1.1)
    if (time.exists(Pattern(lastTime).exact(), 0)):
        # probably stopped, show it
        time.highlight(2)
        print "stopped?"
        break

There might be an equivalent solution using observe().