Shaking video when using an animation on top of it

[deblauwetom]

I am succesfully using the QmlVlc with Qt 5.3. I can play a video just fine, however, I want to overlay some text on it. That works just fine and the text is nicely over the video. But when I do a rotationanimation on the text, the video is shaking.

On the same hardware I tried the qml library of the VlcQt project. It is not as nicely programmed as your library(crashed on stop of the video), but the one thing that I could do was animate text over the video, and also the video itself. So I guess it should be possible to get it working. The Qml file I am using is:

import QtQuick 2.0
import QmlVlc 0.1

Rectangle {
    width: 1920
    height: 1080
    color: "black"

    VlcPlayer {
        id: vlcPlayer;
        mrl: "file:///media/video/test.ts";
    }

    VlcVideoSurface {
        id: videoOutput
        anchors.fill: parent
        source: vlcPlayer

        MouseArea {
            anchors.fill: parent
            onClicked: {
            vlcPlayer.togglePause()
        }
    }
//        RotationAnimation on rotation {
//                 loops: Animation.Infinite
//                 from: 0
//                 to: 3
//             }
    }
    Text {
        anchors.centerIn: parent
        color: "#ffffff"
        style: Text.Outline
        styleColor: "#606060"
        font.pixelSize: 28

        text: "I am the overlay!"
        RotationAnimation on rotation {
             loops: Animation.Infinite
             from: -90
             to: 90
         }
        NumberAnimation on opacity {
            loops: Animation.Infinite
            from: 0.5
            to: 1
        }
    }
}

[RSATom]

Thanks for report, I'll look. Btw, did you try to do the same with VlcMmPlayer + VideoOutput ?

[deblauwetom]

I just tried using QtMultimedia and that works like a charm! No shaking and it works great. For me it is a solution, so feel free to close this issue if you like.

[RSATom]

That just proves it's a bug in VlcVideoSurface :) But of course you free to use VlcMmPlayer, it's just adds QtMultimedia dependancy, which I tried to avoid by VlcVideoSurface.

[RSATom]

What OS and hardware do you have?

[deblauwetom]

This is a Intel Atom board "CedarView", and I am using buildroot to build my OS. I am now using the latest version with Qt 5.3. I use the cedarview driver, and it must have kernel 3.2.55, mesa version 7.11.2 and Xorg server 7.11.4. I also use enlightenment as window manager and enable the composite module.

[RSATom]

Ouch... it will be hard to find such hardware for tests...

on Intel i3-3225 (with integrated video HD 4000) + Windows 7 / Ubuntu 14 your code works without any problem...