My Windows version is Windows 7 64 bit.

This is the Qml page:

@
import QtQuick 2.2

Rectangle
{
width: 950
height: 800
color: "red"

AnimatedImage
{
    x: 0
    y: 0
    width: 180
    height: 180
    source: "gif1.gif"
}

AnimatedImage
{
    x: 300
    y: 0
    width: 180
    height: 180
    source: "gif2.gif"
}

AnimatedImage
{
    x: 610
    y: 50
    width: 140
    height: 210
    source: "gif3.gif"
}

AnimatedImage
{
x: 0
y: 400
width: 180
height: 250
source: "gif4.gif"
}
}
@

That question is a bit too generic. With only that much information it's highly unlikely that someone can reproduce the crash you had. Even more on several platforms.