QtGstreamer on Android

[Alexander Rössler]

I found the problem. In the QtGstreamer lib, some classes are pure virtual
and not correctly exported to the lib. See also this thread here for
an explanation: https://github.com/android-ndk/ndk/issues/519

I fixed the issue by moving the destructors of the culprits to a source
file. I will consider creating a patch for QtGstreamer.

Am Mi., 16. Jan. 2019 um 20:14 Uhr schrieb Alexander Rössler <
machinekoder at gmail.com>:

> I have successfully built and run QtGstreamer on Android. However, I can't
> get QGst::ElementFactory::make to work correctly.
>
> In particular, this dynamic_cast seems to fail:
> https://github.com/GStreamer/qt-gstreamer/blob/master/src/QGlib/refpointer.h#L332
>
> I verified that the problem is not in the installation itself, the call
> GstElement *element = gst_element_factory_make("playbin", NULL); works as
> expected.
>
> I wonder if this problem has anything to do with me using static plugins
> on Android. To test my hypothesis I build one plugin statically on Linux,
> but the problem did not occur.
>
> Does anybody know what could be the problem and how to debug it? I've
> pushed debug logging to TRACE level and I don't see any errors happening,
> so the failing dynamic_cast seems to be a problem.
>
> Thank you for your help.
>
> Alex
>
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