Memory leaks in QtMultimedia 5.0 on QML element MediaPlayer and Video?

Yin_Chang

Hi there,

Not quite sure if this is the right place to post this question. But this is, really, really, driving me crazy... :(

I'm currently working on a project, in which, I need a simple video player component to constantly play a list of videos. Let's say, I have 8 videos, and want to switch to the next video in the list every 10 seconds.

I did the test with a very simple code (see below, only writing QML code, leaving other code files in the project as default). When I run this simple test program, it looks like it keeps eating memory without releasing it.

on start, it uses only around 60 MB memory (observed simply via Windows Task Manager)
30 minutes later, the memory usage goes up to around 130 MB
3 hours later, this program crashes.

So the question here is, is this a bug, or am I walking the wrong way?

Environment:

Windows 7 SP1, Visual Studio 2010, Qt 5.1.0 32 bit.

Code:

(putting the Timer in QML is only for test purpose...)
(the maximum video file size is around 8MB, total size of these 8 videos is less than 24 MB)
@
import QtQuick 2.0
import QtMultimedia 5.0

Rectangle {
id: window
width: 800; height:600

property int        videoIndex: 0
property variant    videos: ["101.mp4", "102.mp4", "103.mp4", "104.mp4", "105.mp4", "106.mp4", "107.mp4", "108.mp4"]

Timer {
    interval: 10000  // change the MediaPlayer source every 10 seconds
    running: true
    repeat: true
    onTriggered: {
        console.log("Now switching to " + videos[videoIndex]);
        videoPlayer.stop();  // stop the current MediaPlayer first
        videoPlayer.source = videos[videoIndex];  // change the MediaPlayer source
        videoPlayer.play();  // start play the MediaPlayer
        if(videoIndex < 7)
        {
            ++videoIndex;
        }
        else
        {
            videoIndex = 0;
        }
    }
}

Rectangle {
    id: bottomRect
    width: window.width; height: window.height

    MediaPlayer {
        id: videoPlayer
        source: "108.mp4"
    }
    VideoOutput {
        id: videoOutput
        source: videoPlayer
        width: parent.width; height: parent.height
    }
}

}
@

Additionally, I've also tried Video instead of MediaPlayer+VideoOutput. Same issue.

Any suggestion would be really appreciate.

stereomatching

I don't know this is a bug or not, but you could report the bug through this website--"bug report":https://bugreports.qt-project.org/login.jsp?permissionViolation=true&os_destination=/secure/ViewProfile.jspa

If this is a bug, maybe you could try another api, like the api of openCV, it is pretty easy to use.

Yin_Chang

Thank you, Robot, I've opened a bug for this.
https://bugreports.qt-project.org/browse/QTBUG-32481

I'll try some api else, thanks for the tip of openCV.

If anyone else met the same issue, and happen to have a solution or workaround, please shed some light on this. Thanks in advance.

Richard Barrass

Hi All,

After futher investigation, i think the issue was more to do with the gstreamer1.0 VA-API plugin.

Thank you

Richard