its probably better to use different Movie Players in the same scene and trigger them according to when you need each movie to play. You can add Video Mixers or Selectors between Movie Players and your Projector(s) and trigger values to these using various methods, such as Envelope Generator, Trigger Delay or Comparator.
If you initialise the speed of each Movie Player to zero, it will not play until you trigger a value of 1 to it.

The YouTube channel is great, as well: troikatronix - YouTube

Cheers,

Hugh

When your videos need to be display at the same time you  can use several projector and movie players in the same scene (button) in the time bar at th efoot of the window

then if you  need after to diplay other video one  or more in the following time , you should create another scene.

You can set crossfade time and type of crossfade in the two box on left top of the scenes bar.

 You can also use the movieplayer position output to trigger another movie player. In this case you will  certainly have to set initializing value for  the position,  when entering the scene.

(to avoid undesired change when playing sveral times your scenes.

Hop it can help and sorry for my bad english writing.

DBO