QMediaPlayer Seek to a position before playing video

magicstar

I want to seek to a position when video is paused and played again.
I have added below code to set position and play media

player->setPosition(pos);
player->play();

However, it would show first frame before seeking to new position.
For e.g. I paused video at 100 ms. Now when I set position to 150 ms, first 100 ms frame will be displayed before continuing video smoothly from 150 ms.
Is there any way, I avoid displaying frame at 100 ms ?

SGaist

Hi,

What version of Qt ?
What platform are you running on ?
What type of video ?

magicstar

@SGaist ,

Qt version 5.12 with MSVC 2017
Platform : Windows
any kind of video . e.g .avi, .mp4

SGaist

Can you check which multimedia backend is loaded ?

For that, set the QT_DEBUG_PLUGINS environment variable to 1 in the Run part of the Project panel.

magicstar

@SGaist said in QMediaPlayer Seek to a position before playing video:

QT_DEBUG_PLUGIN

This is the log I get after following above procedure

QFactoryLoader::QFactoryLoader() looking at "C:/Qt/Qt5.12.0/5.12.0/msvc2017_64/plugins/mediaservice/dsengine.dll"
Found metadata in lib C:/Qt/Qt5.12.0/5.12.0/msvc2017_64/plugins/mediaservice/dsengine.dll, metadata=
{
    "IID": "org.qt-project.qt.mediaserviceproviderfactory/5.0",
    "MetaData": {
        "Keys": [
            "directshow"
        ],
        "Services": [
            "org.qt-project.qt.camera",
            "org.qt-project.qt.mediaplayer"
        ]
    },
    "archreq": 0,
    "className": "DSServicePlugin",
    "debug": false,
    "version": 330752
}


Got keys from plugin meta data ("directshow")
QFactoryLoader::QFactoryLoader() looking at "C:/Qt/Qt5.12.0/5.12.0/msvc2017_64/plugins/mediaservice/dsengined.dll"
Found metadata in lib C:/Qt/Qt5.12.0/5.12.0/msvc2017_64/plugins/mediaservice/dsengined.dll, metadata=
{
    "IID": "org.qt-project.qt.mediaserviceproviderfactory/5.0",
    "MetaData": {
        "Keys": [
            "directshow"
        ],
        "Services": [
            "org.qt-project.qt.camera",
            "org.qt-project.qt.mediaplayer"
        ]
    },
    "archreq": 1,
    "className": "DSServicePlugin",
    "debug": true,
    "version": 330752
}

SGaist

From a quick look at the code, I would say that the behaviour is normal (although not what you'd want) with regard to how it's implemented.

magicstar

@SGaist

is there any other way to achieve expected behaviour ?

SGaist

You would likely have to fiddle with the backend code.