Unable to play video

[jsulm]

@Jonathan-Levanon Check output of

ldd YOUREXE

to see which Qt libs it really uses. Could be that system Qt libs are used. Also qtmultimedia5-dev is only needed if you want to build your app.

[Jonathan Levanon]

@jsulm
I think ldd output is ok -

libQt5OpenGL.so.5 => /home/innereye/Qt5.10.0/5.10.0/gcc_64/lib/libQt5OpenGL.so.5 (0x00007f8ca78ff000)
	libQt5MultimediaWidgets.so.5 => /home/innereye/Qt5.10.0/5.10.0/gcc_64/lib/libQt5MultimediaWidgets.so.5 (0x00007f8ca76e1000)
	libQt5Charts.so.5 => /home/innereye/Qt5.10.0/5.10.0/gcc_64/lib/libQt5Charts.so.5 (0x00007f8ca736b000)
	libQt5Widgets.so.5 => /home/innereye/Qt5.10.0/5.10.0/gcc_64/lib/libQt5Widgets.so.5 (0x00007f8ca6b32000)
	libQt5Multimedia.so.5 => /home/innereye/Qt5.10.0/5.10.0/gcc_64/lib/libQt5Multimedia.so.5 (0x00007f8ca6828000)
	libQt5Gui.so.5 => /home/innereye/Qt5.10.0/5.10.0/gcc_64/lib/libQt5Gui.so.5 (0x00007f8ca6042000)
	libQt5Network.so.5 => /home/innereye/Qt5.10.0/5.10.0/gcc_64/lib/libQt5Network.so.5 (0x00007f8ca5cac000)
	libQt5Test.so.5 => /home/innereye/Qt5.10.0/5.10.0/gcc_64/lib/libQt5Test.so.5 (0x00007f8ca5a72000)
	libQt5Sql.so.5 => /home/innereye/Qt5.10.0/5.10.0/gcc_64/lib/libQt5Sql.so.5 (0x00007f8ca582a000)
	libQt5Core.so.5 => /home/innereye/Qt5.10.0/5.10.0/gcc_64/lib/libQt5Core.so.5 (0x00007f8ca50dc000)

[jsulm]

@Jonathan-Levanon Does /home/innereye/Qt5.10.0/5.10.0/gcc_64/plugins/video/gstvideorenderer/ exist and is there anything inside?

[Jonathan Levanon]

No. But it does not also exist on the computer that can play the videos...

[jsulm]

@Jonathan-Levanon If the app is crashing you should debug it to see where exactly it crashes. This strace errors are not necessarily related to the crash.

[Jonathan Levanon]

This is the output I get when it is crashing

(myApp:2322): GStreamer-CRITICAL **: gst_caps_copy: assertion 'GST_IS_CAPS (caps)' failed

(myApp:2322): GLib-GObject-WARNING **: /build/glib2.0-7ZsPUq/glib2.0-2.48.2/./gobject/gtype.c:4273: type id '0' is invalid

(myApp:2322): GLib-GObject-WARNING **: can't peek value table for type '<invalid>' which is not currently referenced
Segmentation fault (core dumped)
And for mp4 files I get:

(myApp:2189): GStreamer-CRITICAL **: gst_caps_ref: assertion 'GST_CAPS_REFCOUNT_VALUE (caps) > 0' failed

(myApp:2189): GStreamer-CRITICAL **: gst_caps_ref: assertion 'GST_CAPS_REFCOUNT_VALUE (caps) > 0' failed

(myApp:2189): GStreamer-CRITICAL **: gst_caps_unref: assertion 'GST_CAPS_REFCOUNT_VALUE (caps) > 0' failed

(myApp:2189): GLib-GObject-WARNING **: /build/glib2.0-7ZsPUq/glib2.0-2.48.2/./gobject/gtype.c:4273: type id '0' is invalid

(myApp:2189): GLib-GObject-WARNING **: can't peek value table for type '<invalid>' which is not currently referenced
Segmentation fault (core dumped)

[SGaist]

Hi,

Might be a silly question but did you check that you have the GStreamer plugin packages installed on that machine ?

[Jonathan Levanon]

Yes. The weird thing is that on this computer qt works with the 0.10 version of gstreamer, and on the others with 1.0. Can I change it?
Both are installed (including plugins)

[Jonathan Levanon]

@jsulm I've compiled on the same computer, still get the same errors :(

[Jonathan Levanon]

Update - After a very long day, turns out that opencv lib was linked to gstreamer0.10, qt to 1.0. This did not work well obviously.
When compiling opencv with linking to gstreamer1.0, works ok.