[Development] QtMultimedia on Android

Tue Jun 11 14:10:11 CEST 2013

Hi,

There is an issue in 5.1 when starting a video immediately on app startup. Could you try to delay the loading and starting of the video, on mouse click for example, and see if the problem is still there?

If you compile the wip/android branch, make sure to remove the 5.1 multimedia plugin both on your host machine (<qtdir>/plugins/mediaservice) and on the device ("Clean Libs on Device" button in QtCreator in the "Deploy configurations panel"). The name has changed in 5.2 and the app might load the wrong plugin. The plugin name in 5.1 is libandroidmediaplayer and in 5.2 it's libqtmedia_android.

Yoann Lopes
Senior Software Engineer - Digia, Qt
Visit us on: http://qt.digia.com

On Jun 10, 2013, at 7:37 PM, Łukasz Korbel wrote:

I want to report problem with usage of QML MediaPlayer/VideoOutput on Android.
We used very simple qml file for test (working good on linux) with sample video that plays correctly on android native player.

We don't put this message on interest list because we believe there are some problems within implementation. Similar testing application was working with build from 5.1 alpha release time (unfortunately not the one tagged as "alpha" now and we could've not find working commit again).

We're using build from stable branch from 27-05-2013. Libs and application were build for Android SDK API level 14. When running application on Android devices proper windows shows up, we can hear audio of playback but no video at all (black screen all the time, like frames were not drawn to surface texture). Same effect observed with QtMultimedia libs built from wip/android branch.
I've attached project source. I've also attached output from logcat (android.log). Two most suspicious lines from logs are:

W/System.err( 7783): java.lang.InstantiationException: can't instantiate class org.qtproject.qt5.android.multimedia.QtAndroidMediaPlayer; no empty constructor

and...

E/BufferQueue( 7783): [unnamed-7783-0] dequeueBuffer: SurfaceTexture has been abandoned!
E/SoftwareRenderer(   87): Surface::dequeueBuffer returned error -19

First we thought that this is because QtAndroidMediaPlayer starts before SurfaceHolder is set but looks like the problem lies somewhere else. Is there something wrong in implementation indeed or is just we doing something wrong here?

Thanks in advance for help,

Łukasz Korbel
Senior Software Developer

Milo Solutions
(+48) 517539562

http://milosolutions.com

P.S.
For quick review key parts of source.

main.qml
----------------------------------------------------------------------------------------------------------------------
import QtQuick 2.0
import QtMultimedia 5.0

Rectangle {
    id: player
    width: 1024
    height: 720

    MediaPlayer {
        id: mediaplayer
        autoLoad: true
        autoPlay: true
        volume: 1.0
        source: "file:///mnt/sdcard/Download/test.mp4"
    }

    VideoOutput {
        id: videoOutput
        width: parent.width
        height: parent.height
        anchors.centerIn: parent
        fillMode: VideoOutput.PreserveAspectFit
        source: mediaplayer
    }
}
----------------------------------------------------------------------------------------------------------------------

AndroidManifest.xml
----------------------------------------------------------------------------------------------------------------------
<?xml version='1.0' encoding='utf-8'?>
<manifest android:versionCode="1" package="org.qtproject.example.mediaplayer_test" xmlns:android="http://schemas.android.com/apk/res/android" android:sharedUserId="com.milosolutions.qt" android:versionName="1.0">
    <application android:name="org.qtproject.qt5.android.bindings.QtApplication" android:label="@string/app_name">
        <activity android:name="org.qtproject.qt5.android.bindings.QtActivity" android:configChanges="orientation|locale|fontScale|keyboard|keyboardHidden" android:label="@string/app_name">
            <intent-filter>
                <action android:name="android.intent.action.MAIN"/>
                <category android:name="android.intent.category.LAUNCHER"/>
            </intent-filter>
            <meta-data android:name="android.app.qt_sources_resource_id" android:resource="@array/qt_sources"/>
            <meta-data android:name="android.app.repository" android:value="@string/repository"/>
            <meta-data android:name="android.app.qt_libs_resource_id" android:resource="@array/qt_libs"/>
            <meta-data android:name="android.app.bundled_libs_resource_id" android:resource="@array/bundled_libs"/>
            <meta-data android:name="android.app.lib_name" android:value="mediaplayer-test"/>

            <!-- Run with local libs -->
            <meta-data android:name="android.app.use_local_qt_libs" android:value="1"/>
            <meta-data android:name="android.app.libs_prefix" android:value="/data/data/com.milosolutions.qt/app_data/"/>
            <meta-data android:name="android.app.load_local_libs" android:value="plugins/mediaservice/libandroidmediaplayer.so:lib/libQt5MultimediaQuick_p.so:lib/libQt5QuickParticles.so:plugins/platforms/android/libqtforandroidGL.so:"/>
            <meta-data android:name="android.app.load_local_jars" android:value="jar/QtAndroid.jar:jar/QtMultimedia.jar:"/>
            <meta-data android:name="android.app.static_init_classes" android:value="org.qtproject.qt5.android.multimedia.QtAndroidMediaPlayer:"/>
            <!--  Messages maps -->
            <meta-data android:name="android.app.ministro_not_found_msg" android:value="@string/ministro_not_found_msg"/>
            <meta-data android:name="android.app.ministro_needed_msg" android:value="@string/ministro_needed_msg"/>
            <meta-data android:name="android.app.fatal_error_msg" android:value="@string/fatal_error_msg"/>
            <!--  Messages maps -->
            <!-- Splash screen -->
            <meta-data android:name="android.app.splash_screen" android:resource="@layout/splash"/>
            <!-- Splash screen -->
        </activity>
    </application>
    <supports-screens android:largeScreens="true" android:normalScreens="true" android:anyDensity="true" android:smallScreens="true"/>
    <uses-feature android:glEsVersion="0x00020000"/>
    <uses-permission android:name="android.permission.INTERNET"/>
    <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"/>
</manifest>
----------------------------------------------------------------------------------------------------------------------

libs.xml
----------------------------------------------------------------------------------------------------------------------
<?xml version='1.0' encoding='utf-8'?>
<resources>
    <array name="qt_sources">
        <item>https://download.qt-project.org/ministro/android/qt5/latest</item>
    </array>
    <string name="repository">default</string>
    <array name="bundled_libs"/>
    <array name="bundled_in_lib"/>
    <array name="bundled_in_assets"/>
    <array name="qt_libs">
        <item>gnustl_shared</item>
        <item>Qt5Core</item>
        <item>Qt5Gui</item>
        <item>Qt5Network</item>
        <item>Qt5V8</item>
        <item>Qt5Qml</item>
        <item>Qt5Quick</item>
        <item>Qt5Multimedia</item>
    </array>
</resources>
----------------------------------------------------------------------------------------------------------------------

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