Unable to play video

Jonathan Levanon

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?

jsulm

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

Jonathan Levanon

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

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_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.