the name of the property you are setting which will be one
of
rect : the rect of the control
visible : the visible of the control
rate : the play rate of the player where 0 is paused. 1 is normal
forward play and -1 is reverse. See "can play fast forward" and
"can play fast reverse" properties
video gravity : how to size the video within the rect of the player.
One of:
stretch
aspect
aspect fill
forward playback end time : set the time at which playback should
end when the playback rate is positive. Time should be in milliseconds.
The value of this property has no effect on playback when the rate is
negative.
reverse playback end time : set the time at which playback should
end when the playback rate is negative. Time should be in milliseconds.
The value of this property has no effect on playback when the rate is
positive.