I realize that this was asked years ago, but for the sake of other users: You can control IMPLAY programmatically, if you have access to its handle. E.g., by running:
myHandle = implay('someVideo.avi');
Using this handle, you can access the GIU's PlaybackControlsTimer object as follows:
myControls = myHandle.DataSource.Controls;
At this point you can call 'play', 'stepFwd' and others to control the video. E.g., in order to advance the player one frame forward, use:
stepFwd(myControls)
