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swapping video textures on sprite


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I have an application in which I need to swap in image and video content live. Currently I do this by preloading all images and using 

mySprite.texture = PIXI.loader.resources[imageFilename].texture;

the videos will be too large to preload, so I'm trying to swap them in like so:

mySprite.texture = PIXI.Texture.fromVideoUrl(videoFilename);

is this the correct way to swap textures? should I be swapping in a whole new sprite or maybe just the BaseTexture?

When I try and add 

var myOldTexture = mySprite.texture;

//then I assign mySprite.texture the new content...
//...and then:

if(myOldTexture.baseTexture.source.play) //is video

I get a repeating "Uncaught TypeError: Cannot read property 'naturalWidth' of null" error, even though the texture I've destroyed shouldn't be in use at that point, right?

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