< Phonon
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Phonon/Environment Variables



Load a specific backend. The backend name must be the backend plugin name without file extension. For example "phonon_vlc" for the VLC backend. Mind that the backend must be in the Phonon or Qt plugin path.


Set to a value between 0 and 5 to define verbosity of debug output.

PHONON_PAINT (QML Branch only)

Set to change painting method of VideoGraphicsObject and QML VideoOutput. Can be:

  • qpainter to force QPainter (will create an RGB32 QImage)
  • Only working when a QGLContext is present (i.e. the output/object is in a QGraphicsView with QGLWidget viewport)
    • glsl for GLSL shader painting
    • glarb for GLARB shader painting
    • qglcontext to force painting via context builtin functions (will create an RGB32 QImage)


Set to the full path of a platform plugin to make it preferred choice over autodetected plugins.


Set to a value between 0 and 5 to define verbosity of PulseAudio debug output.


Set to any number to deactivate PulseAudio integration completely. This can also be implicitly achieved by setting QT_NO_GLIB to 1.


Set to value between 0 and 5 to define the verbosity of debug output from the backend itself.


This value is passed to the backend's underlying library or framework's debugging system, such as via gst_init() or libvlc_new(). The value's interpretation depends on that particular library.

Phonon GStreamer


Set to C integer boolean to allow listing of all effect plugins known to GStreamer.


Set to a valid GStreamer audiosink name to force a specific sink (ignored when PulseAudio support is active)


Set to anything to activate display of frames per second. This only works with videomode software.


Forces a painting method on the GStreamer VideoWidget. Can be:

  • opengl only if built with OpenGL support
  • software paint using QPainter and intermediate creation of a QImage
  • xwindow only available on X11, uses X11 overlay painting


Activates OpenMAX support on Tegra graphics setups. This only works with xwindow videomode.

Phonon VLC

This page was last edited on 13 September 2011, at 19:33. Content is available under Creative Commons License SA 4.0 unless otherwise noted.