Problems with qmlgl plugin

[Nicolas Dufresne]

Le sam. 6 juill. 2019 20 h 40, xargs <gstreamer at xargs.com> a écrit :

> I've built Qt 5.12.4 from source and GStreamer from git.  My goal is
> to be able to display video in a Qt application with the qmlgl
> GStreamer plugin.  I've built this successfully on an x86 Ubuntu
> platform, but when I build it on an ARM Ubuntu platform (Firefly), it
> all builds successfully, but gst-inspect cannot find the qmlgl plugin,
> while all other plugins are working as expected.
>
> Qt and GStreamer are installed in their default locations (/usr/local)
>
> Running ldd on libgstqmlgl.so returns no errors.
>
> $ set | grep PATH
>
> GST_PLUGIN_PATH=/usr/local/lib/gstreamer-1.0
> GST_PLUGIN_SYSTEM_PATH_1_0=/usr/local/lib/gstreamer-1.0
>
> LD_LIBRARY_PATH=/usr/local/lib:/usr/local/Qt-5.12.4/lib:/usr/local/lib/gstreamer-1.0
>
> PATH=/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:/usr/games:/usr/local/games:/snap/bin
>
> $ gst-inspect-1.0 qmlgl
> No such element or plugin 'qmlgl'
>
> $ ls -l /usr/local/lib/gstreamer-1.0/libgstqmlgl.so
> -rwxr-xr-x 1 root root 2209752 Jul  5 12:38
> /usr/local/lib/gstreamer-1.0/libgstqmlgl.so
>
> gst-inspect-1.0 --gst-plugin-path=/usr/local/lib/gstreamer-1.0  qmlgl
> No such element or plugin 'qmlgl'
>
> Specifying the path to the plugin gives the expected results:
>
> $ gst-inspect-1.0 /usr/local/lib/gstreamer-1.0/libgstqmlgl.so
>
> Plugin Details:
>   Name                     qmlgl
>   Description              Qt gl plugin
>   Filename                 /usr/local/lib/gstreamer-1.0/libgstqmlgl.so
>   Version                  1.17.0.1
>   License                  LGPL
>   Source module            gst-plugins-good
>   Source release date      2019-07-05 04:34 (UTC)
>   Binary package           GStreamer Good Plug-ins git
>   Origin URL               Unknown package origin
>
>   qmlglsink: Qt Video Sink
>   qmlglsrc: Qt Video Source
>
>   2 features:
>   +-- 2 elements
>
> Any other plugin also gives the expected results without the path:
>
> $ gst-inspect-1.0 png
>
> Plugin Details:
>   Name                     png
>   Description              PNG plugin library
>   Filename                 /usr/local/lib/gstreamer-1.0/libgstpng.so
>   Version                  1.17.0.1
>   License                  LGPL
>   Source module            gst-plugins-good
>   Source release date      2019-07-05 04:34 (UTC)
>   Binary package           GStreamer Good Plug-ins git
>   Origin URL               Unknown package origin
>
>   pngdec: PNG image decoder
>   pngenc: PNG image encoder
>
>   2 features:
>   +-- 2 elements
>
> Does anyone have any ideas?
>

That is strange, have you considered removing the registry cache ? Maybe
you have some clock/timestamp glitchs ? It happens sometimes on system that
does not have a persistent RTC.


>
>
>
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