QMediaPlayer no video only audio
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I'm trying to get the basic VideoPlayer example to run but I do not get any video, only audio (https://doc.qt.io/qt-5.11/qtmultimedia-multimediawidgets-videowidget-example.html). Hoping someone can give me some things to try. I'm running KDE on Ubuntu 18.04. I have tested all the videos I'm trying in other tools and they work just fine.
Qt 5.11.2 (x86_64-little_endian-lp64 shared (dynamic) release build; by GCC 5.3.1 20160406 (Red Hat 5.3.1-6)) on "xcb"
OS: Ubuntu 18.04.1 LTS [linux version 4.15.0-38-generic] -
Ok - got it working. The Qt multimedia library installed with my linux distro (5.9.5) apparently doesn't work so I:
- installed 5.11.2 in ~/qt5.11.2
- ran a "make clean"
- ran qmake from "~/qt5.11.2/gcc_64/bin/qmake"
- ran make
- export LD_LIBRARY_PATH="~/qt5.11.2/gcc_64/lib"
- export QT_PLUGIN_PATH="~/qt5.11.2/gcc_64/plugins"
- ran the application
With 5.11.2 the video and audio appear to be working.
Thanks for the help
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Hi and welcome to devnet,
What kind of video is that ?
Did you check that you have all of the GStreamer stuff installed ? -
I tried with every type of video file I have locally, mov, avi, mp4, etc. I tried installing every gstreamer package I could get my hands on.
ii gir1.2-gstreamer-1.0 1.14.1-1~ubuntu18.04.1 amd64 GObject introspection data for the GStreamer library
ii gstreamer-qapt 3.0.4-0ubuntu1 amd64 GStreamer plugin to install codecs using QApt
ii gstreamer1.0-alsa:amd64 1.14.1-1ubuntu1~ubuntu18.04.1 amd64 GStreamer plugin for ALSA
ii gstreamer1.0-clutter-3.0:amd64 3.0.26-1 amd64 Clutter PLugin for GStreamer 1.0
ii gstreamer1.0-doc 1.14.1-1~ubuntu18.04.1 all GStreamer core documentation and manuals
ii gstreamer1.0-fluendo-mp3:amd64 0.10.32.debian-1 amd64 Fluendo mp3 decoder GStreamer 1.0 plugin
ii gstreamer1.0-gl:amd64 1.14.1-1ubuntu1~ubuntu18.04.1 amd64 GStreamer plugins for GL
ii gstreamer1.0-libav:amd64 1.14.1-1~ubuntu18.04.1 amd64 libav plugin for GStreamer
ii gstreamer1.0-nice:amd64 0.1.14-1 amd64 ICE library (GStreamer plugin)
ii gstreamer1.0-packagekit 1.1.9-1ubuntu2.18.04.3 amd64 GStreamer plugin to install codecs using PackageKit
ii gstreamer1.0-plugins-bad:amd64 1.14.1-1ubuntu1~ubuntu18.04.1 amd64 GStreamer plugins from the "bad" set
ii gstreamer1.0-plugins-base:amd64 1.14.1-1ubuntu1~ubuntu18.04.1 amd64 GStreamer plugins from the "base" set
ii gstreamer1.0-plugins-base:i386 1.14.1-1ubuntu1~ubuntu18.04.1 i386 GStreamer plugins from the "base" set
ii gstreamer1.0-plugins-base-apps 1.14.1-1ubuntu1~ubuntu18.04.1 amd64 GStreamer helper programs from the "base" set
ii gstreamer1.0-plugins-good:amd64 1.14.1-1ubuntu1~ubuntu18.04.1 amd64 GStreamer plugins from the "good" set
ii gstreamer1.0-plugins-ugly:amd64 1.14.1-1~ubuntu18.04.1 amd64 GStreamer plugins from the "ugly" set
ii gstreamer1.0-pulseaudio:amd64 1.14.1-1ubuntu1~ubuntu18.04.1 amd64 GStreamer plugin for PulseAudio
ii gstreamer1.0-tools 1.14.1-1~ubuntu18.04.1 amd64 Tools for use with GStreamer
ii gstreamer1.0-vaapi:amd64 1.14.1-1~ubuntu18.04.1 amd64 VA-API plugins for GStreamer
ii gstreamer1.0-x:amd64 1.14.1-1ubuntu1~ubuntu18.04.1 amd64 GStreamer plugins for X11 and Pango
ii libgstreamer-gl1.0-0:amd64 1.14.1-1ubuntu1~ubuntu18.04.1 amd64 GStreamer GL libraries
ii libgstreamer-plugins-bad1.0-0:amd64 1.14.1-1ubuntu1~ubuntu18.04.1 amd64 GStreamer libraries from the "bad" set
ii libgstreamer-plugins-base1.0-0:amd64 1.14.1-1ubuntu1~ubuntu18.04.1 amd64 GStreamer libraries from the "base" set
ii libgstreamer-plugins-base1.0-0:i386 1.14.1-1ubuntu1~ubuntu18.04.1 i386 GStreamer libraries from the "base" set
ii libgstreamer-plugins-base1.0-dev 1.14.1-1ubuntu1~ubuntu18.04.1 amd64 GStreamer development files for libraries from the "base" set
ii libgstreamer-plugins-good1.0-0:amd64 1.14.1-1ubuntu1~ubuntu18.04.1 amd64 GStreamer development files for libraries from the "good" set
ii libgstreamer1.0-0:amd64 1.14.1-1~ubuntu18.04.1 amd64 Core GStreamer libraries and elements
ii libgstreamer1.0-0:i386 1.14.1-1~ubuntu18.04.1 i386 Core GStreamer libraries and elements
ii libgstreamer1.0-dev 1.14.1-1~ubuntu18.04.1 amd64 GStreamer core development files
ii libreoffice-avmedia-backend-gstreamer 1:6.0.6-0ubuntu0.18.04.1 amd64 GStreamer backend for LibreOffice
ii phonon-backend-gstreamer:amd64 4:4.9.0-1 amd64 Phonon GStreamer 1.0 backend
ii phonon-backend-gstreamer-common:amd64 4:4.9.0-1 amd64 Phonon GStreamer 1.0.x backend icons
ii phonon4qt5-backend-gstreamer:amd64 4:4.9.0-1 amd64 Phonon Qt5 GStreamer 1.0 backend -
Tried uninstalling all gstreamer related packages. Once uninstalled the application core dumps. I reinstalled everything and it's back to showing a black video window. Audio works fine.
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Does it do the same with your distribution provided Qt ?
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Thanks for the help! All of my testing had been with the distribution qt (version 5.9.5). I installed 5.11.2, and 5.0.2 and had the same results.
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Ok - got it working. The Qt multimedia library installed with my linux distro (5.9.5) apparently doesn't work so I:
- installed 5.11.2 in ~/qt5.11.2
- ran a "make clean"
- ran qmake from "~/qt5.11.2/gcc_64/bin/qmake"
- ran make
- export LD_LIBRARY_PATH="~/qt5.11.2/gcc_64/lib"
- export QT_PLUGIN_PATH="~/qt5.11.2/gcc_64/plugins"
- ran the application
With 5.11.2 the video and audio appear to be working.
Thanks for the help
