Important: Please read the Qt Code of Conduct - https://forum.qt.io/topic/113070/qt-code-of-conduct
SIGSEGV on gst_element_set_state when trying to run any of QMediaPlayer examples - Ubuntu 20.10
Hello Qt forum,
After about a month ago I updated my OS to 20.10, and I believe, after this update I am not able to run any of the Qt examples that rely on
I tried versions of Qt: 5.15.0 and 5.15.2 and it is the same on both.
I ran the
videowidgetexample in the Debug mode, and was able to see the line of code where it fails:
GstStateChangeReturn ret = gst_element_set_state(element, GST_STATE_READY);from the file
I checked and I believe I have the GStreamer installed, but now started to wonder if I need to update any packages, or what could be the source of this behavior? Any tips?
Here is the screenshot of the debug window, in case if it may be helpful:
Hi and welcome to devnet,
Did you try to build your application with the distribution provided Qt ?
y to build your application with the distribution provided Qt
Hello, not sure if I understood correctly, but I didn't build the Qt from source, my Qt is installed using Qt Maintenance Tool for Linux. Would you advise to build the necessary Qt libraries from source to try to solve this problem?
Not at all, my suggestion is to use your distribution's package manager to install the development packages for Qt as they provide it.
Thank you for the suggestion, I had just installed Qt using the
apt-get. It installed the latest version 5.14.2. I added the multimedia package. Unfortunately, I'm still experiencing the same issue (SIGSEGV) with this kit as well.
Can you test if you can play that media file directly with GStreamer ?
This post is deleted!
Yes, I am able to open my mp4 file as well as run the test file.
I use the following command to open up the mp4 video file:
gst-launch-1.0 filesrc location=myfile.mp4 ! qtdemux ! avdec_h264 ! queue ! videoconvert ! autovideosink
Just to be sure everything is done correctly, does the player get the full path the file ? It should not trigger a segfault though.
does the player get the full path the file
The SIGSEGV happens on this line:
m_mediaPlayer = new QMediaPlayer(this, QMediaPlayer::VideoSurface);. So, I cannot call the constructor of the class.
I feel like it may be a problem with Qt not finding the GStream library path correctly, or something within those lines. Unfortunately, I do not have much understanding beyond that.
Which packages of GStreamer did you install ?
Do you also have that in a dummy project with just the video player ?