# Simultaneous movie and image presentation

**URL:** <https://psychtoolbox.discourse.group/t/simultaneous-movie-and-image-presentation/4313>\
**Category:** Programming Help\
**Tags:** windows\
**Created:** [March 17, 2022, 8:43am UTC](https://psychtoolbox.discourse.group/t/simultaneous-movie-and-image-presentation/4313 "2022-03-17T08:43:43Z")\
**Posts on this page:** 1\
**Showing post:** 2

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**Author:** ![Ian-Max-Andolina](https://yyz2.discourse-cdn.com/free1/user_avatar/psychtoolbox.discourse.group/ian-max-andolina/32/4_2.png) [@Ian-Max-Andolina](https://psychtoolbox.discourse.group/u/Ian-Max-Andolina)\
**Post date:** [March 17, 2022, 9:40am UTC](https://psychtoolbox.discourse.group/t/simultaneous-movie-and-image-presentation/4313/2 "2022-03-17T09:40:07Z")

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By default, if you are using `Screen('GetMovieImage')` then this will “block” waiting for the next frame, and your timing will be dictated by the frame rate of the movie. You could make your `Flip` times a multiple of the movie frame rate. But another solution requires not using blocking mode and using a second buffer texture. If `Screen('GetMovieImage')` returns a new frame, show that, if not, show the previous frame.

My [movieStimulus class uses this technique](https://github.com/iandol/opticka/blob/master/stimuli/movieStimulus.m#L243) (this is an OOP class and so `me` refers to itself):

```matlab
me.blocking = false;
me.texture = Screen('GetMovieImage', me.sM.win, me.movie, me.blocking);
if me.texture > 0
	if ~isempty(me.buffertex) && ...
			me.buffertex > 0 && ...
			me.buffertex ~= me.texture && Screen(me.buffertex,'WindowKind') == -1
		try Screen('Close', me.buffertex); end
		me.buffertex=[]; 
	end
	Screen('DrawTexture', me.sM.win, me.texture, [], me.mvRect,...
		angle,[],[],[],me.shader);
	me.buffertex = me.texture; %copy new texture to buffer
elseif me.buffertex > 0
	Screen('DrawTexture', me.sM.win, me.buffertex, [], me.mvRect,...
		angle,[],[],[],me.shader)
end

```

Roughly it checks if `texture` is \> 0 (a new frame): if so check if a previous `buffertex` is present and close it, then draw the new `texture` and assign it to `buffertex` | otherwise just draw `buffertex`. Now the timing is only dictated by `Screen('Flip')`, and so your other animations will work fine.You can see this in action easily with my toolbox:

```auto
m = metaStimulus;
m{1} = dotsStimulus('xPosition', 4, 'mask', true);
m{2} = movieStimulus('blocking', 0);
m.run; %test run of the stimuli

```

This creates a movie and an RDS stimulus, then runs them together at the FPS of the monitor display; the movie does not hold up the timing of the RDS…

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