iphone: scale when using glgif library

I am using glgif to display some gif picture on iphone, the gif is be downloaded from web. I display it on iphone successfully but the picture seems wrong scale. It happened to many pictures. Can anyone suggest me to fix this开发者_如何学Go? I dig in to glgif but can not find a way to fix.

Thank you very much.

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Uncomment [self setAspectScale:YES]; inside -(void)startAnimation:(Video*)video;