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Unable to play video



  • Hi

    I'm using qt 5.10. My app runs fine on 3 different computer with ubuntu 16.04, but I'm trying to deploy it on 4th one and video playing is crashing the app.
    I ran starce on it, and I get the following message after the video is opened -
    access("/home/innereye/Qt5.10.0/5.10.0/gcc_64/plugins/video/gstvideorenderer/.", F_OK) = -1 ENOENT (No such file or directory)
    access("/home/innereye/Desktop/0.2.0/video/gstvideorenderer/.", F_OK) = -1 ENOENT (No such file or directory)

    I've installed qt from the installer, and also installed qtmultimedia5-dev

    On the computer that do run, this line does not show when running the same application.

    Any suggestions?


  • Qt Champions 2018

    @Jonathan-Levanon What OS is running on that computer?
    Did you build your app on that computer?



  • No, it was built on another computer.
    Running on ubuntu 16.04


  • Qt Champions 2018

    @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.



  • @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)
    

  • Qt Champions 2018

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



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


  • Qt Champions 2018

    @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.



  • 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)


  • Lifetime Qt Champion

    Hi,

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



  • 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)



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



  • 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.


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