适用于 Android + Gstreamer 的 Qt 创建者

Question

I am using Qt Creator with Qt 5.9.1 for Android under a Linux 64 bit client and I'm trying to pull in Gstreamer 1.12.2 for Android into the build. I am able to partially run the gstreamer code. It will run gst_init and pass, but gst_parse_launch fails without being able to find any plugins, I always receive the same warning during runtime/debug with the error pointing to the first plugin. Example below.

no element for "videotestsrc"

I assume my *.pro file is to blame, but I cannot find a solution that uses the *.mk files that gstreamer illustrates in their documentation . Due to gradle usage, and my unfamiliarity with gradle, I am unable to find where to use the *.mk files.

My *.pro file includes the following for plugins, but I seem to be missing something that links them together.

GST_ROOT = /usr/local/share/gstreamer-1.0-android/x86

INCLUDEPATH += $$GST_ROOT/include \
$$GST_ROOT/include/glib-2.0 \
$$GST_ROOT/lib/glib-2.0/include \
$$GST_ROOT/lib/gstreamer-1.0/include \
$$GST_ROOT/include/gstreamer-1.0

LIBS += -L$$GST_ROOT/lib/gstreamer-1.0/static  -lgstvideo-1.0 -lgstaudio-1.0 -lgstcoreelements \
    -lgstudp -lgstrtp -lgstx264 -lgstlibav -lgstvideoparsersbad -lgstadder -lgstapp -lgstaudiorate \
    -lgstaudioresample -lgstgio -lgstpango -lgstrawparse -lgsttypefindfunctions -lgstvideorate \
    -lgstvideoscale -lgstvolume -lgstvideofilter -lgstsoup -lgstopensles \
    -lgstvideotestsrc -lgstplayback -lgstaudiotestsrc -lgstaudioconvert -lgstvideoconvert \
    -lgstinterleave -lgstautodetect -lgstandroidmedia -lgstphotography-1.0 -lgstopengl

LIBS += -L$$GST_ROOT/lib/ -lgstreamer-1.0 -lgobject-2.0 -lgmodule-2.0 -lglib-2.0 \
    -lgstbase-1.0 -lgstrtsp-1.0 -lgstvideo-1.0 -lgnutls \
     -lintl -liconv -pthread  -lffi

C code sample for registering the plugins:

GST_PLUGIN_STATIC_DECLARE(coreelements);
GST_PLUGIN_STATIC_DECLARE(videotestsrc);

MainWindow::MainWindow(QWidget *parent) :
    QMainWindow(parent),
    ui(new Ui::MainWindow)
{
    ui->setupUi(this);

    GError *error;

    //init gstreamer
    gst_init (NULL, NULL);
    gst_init_check (NULL, NULL, &error);

    //to check in debug
    gboolean i = gst_is_initialized(); //returns 1

    GST_PLUGIN_STATIC_REGISTER(coreelements);  //fails -> cannot find gst_plugin_coreelements_register();
    GST_PLUGIN_STATIC_REGISTER(videotestsrc);  //fails -> cannot find gst_plugin_videotestsrc_register();

    ...

Any help would be useful, thanks for your time.

Answer 1

your gstreamer plugin not added to android device. In you pro file in Libs just linked, but not added to android. Just add this for each plugin:

ANDROID_EXTRA_LIBS += \
      /path/to/plugins/android/gstreamer/libgstcoreelements.so \