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  1. Qt
  2. QTBUG-43811

QML animation running too fast on Windows 7

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      Description

      Consider the following simple example:

      import QtQuick 2.0
      
      Rectangle {
          id: root
          width: 800
          height: 600
          color: "black"
          focus: true
      
          Rectangle {
              id: rect
              width: 150
              height: parent.height
      	color: "seagreen"
              visible: animation.running
      
              NumberAnimation on x {
                  id: animation
                  from: -rect.width
                  to: root.width
                  loops: Animation.Infinite
                  duration: 4000
                  running: false
              }
          }
      
          Keys.onSpacePressed: animation.running = true
      }
      

      The speed of green bar is incosistent when switching between different versions of Qt on Windows 7 (x64). The speed is equal and as expected for versions 5.1.1, 5.2.1, and 5.3. Alas, on 5.4 animation is running approximately 2 times faster than desired.

      No such behaviour for Mac OS X 10.10, and Ubuntu 12.02 (verified for the same list of Qt versions).

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              Assignee:
              sletta Gunnar Sletta
              Reporter:
              dvolosnykh Dmitry Volosnykh
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                Updated:
                Resolved:

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