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A media playing framework based on Qt and FFmpeg. It helps you to write a player easily. 基于Qt和FFmpeg的音视频播放框架
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QtAV is a media playing library based on Qt and FFmpeg. It can help you to write a player with less effort than ever before.

QtAV has been added to FFmpeg projects page

QtAV is free software licensed under the term of LGPL v2.1. If you use QtAV or its constituent libraries, you must adhere to the terms of the license in question.

Download binaries from sourceforge

Source code on github


QtAV can meet your most demands

  • Hardware decoding suppprt: DXVA2, VAAPI(buggy now), CedarX(e.g. pcDuino)
  • Seek, pause/resume
  • Video capture
  • OSD and custom filters
  • Aspect ratio
  • Transform video using GraphicsItemRenderer. (rotate, shear, etc)
  • Playing frame by frame (currently support forward playing)
  • Playing speed control. At any speed.
  • Variant streams: locale file, http, rtsp, etc.
  • Playing music
  • Choose audio channel
  • Choose media stream, e.g. play a desired audio track
  • Volume control
  • Fullscreen, stay on top
  • Multiple render engine support. Currently supports QPainter, GDI+, Direct2D, XV and OpenGL(and ES2).
  • Dynamically change render engine when playing.
  • Multiple video outputs for 1 player
  • Region of interest(ROI), i.e. video cropping
  • Video eq: brightness, contrast, saturation
  • QML support as a plugin. Most playback APIs are compatible with QtMultiMedia module
  • Compatiblity: QtAV can be built with both Qt4 and Qt5. QtAV supports both FFmpeg(>=0.9) and Libav.

Extensible Framework (work in progress)

QtAV currently uses FFmpeg to decode video, convert image and audio data, and uses PortAudio to play sound. Every part in QtAV is designed to be extensible. For example, you can write your decoder, audio output for particular platform. Here is a very good example to add cedar hardware accelerated decoder for A13-OLinuXino

For Developers


  1. FFmpeg (>=0.9)Latest version is recommanded.


or Libav (>=0.8) Latest version is recommanded.


  1. Qt 4 or 5
  2. PortAudio v19
    PortAudio LogoPortAudio

or OpenAL OpenAL

The required development files for MinGW can be found in sourceforge page: depends


You can build QtAV with many compilers and on many platforms. You can use gcc, clang, vc to compile it.
See the wiki Build QtAV and QtAV Build Configurations

Here is a brief guide:

It's recommend not to build in source dir.

cd your_build_dir
qmake QtAV_project_dir/

qmake will run check the required libraries at the first time, so you must make sure those libraries can be found by compiler. Then qmake will create a cache file .qmake.cache in your build dir. Cache file stores the check results, for example, whether portaudio is available. If you want to recheck, run qmake QtAV_project_dir/ -config recheck

WARNING: If you are in windows mingw with sh.exe environment, you may need run qmake twice.(ISSUE #18)

How To Write a Player

Wrtie a media player using QtAV is quite easy.

WidgetRenderer renderer;;
AVPlayer player;

For more detail to using QtAV, see the wiki Use QtAV In Your Project or examples.

QtAV can also be used in Qml

import QtQuick 2.0
import QtAV 1.3
Item {
    VideoOut {
        anchors.fill: parent
        source: player
    AVPlayer { //or MediaPlayer
        id: player
        source: "test.mp4"
    MouseArea {
        anchors.fill: parent

How To Contribute

  • Fork QtAV project on github and make a branch. Commit in that branch, and push, then create a pull request to be reviewed and merged.
  • Create an issue if you have any problem when using QtAV or you find a bug, etc.
  • What you can do: translation, writing document, find or fix bugs, give your idea for this project etc.


For End Users

Player Usage

An simple player can be found in examples. The command line options is

player [-ao null] [-vo qt|gl|d2d|gdi|xv] [-vd "dxva[;vaapi[;ffmpeg]]"] [url|path|pipe:]

To disable audio output, add -ao null

Choose a render engine with -vo option(default is OpenGL). For example, in windows that support Direct2D, you can run

player -vo d2d filename

To select decoder, use -vd option. Value can be dxva, vaapi and ffmpeg, or a list separated by ; in priority order. For example:

player -vd "dxva;ffmpeg" filename

will use dxva if dxva can decode, otherwise ffmpeg will be used.

QMLPlayer has less options now. To use DXVA decoder:

QMLPlayer-vd "DXVA;FFmpeg" filename

Default Shortcuts

  • Double click: fullscreen switch
  • Ctrl+O: open a file
  • Space: pause/continue
  • F: fullscreen on/off
  • I: switch display quality
  • T: stays on top on/off
  • N: show next frame. Continue the playing by pressing "Space"
  • O: OSD
  • P: replay
  • Q/ESC: quit
  • S: stop
  • R: switch aspect ratio
  • M: mute on/off
  • Up / Down: volume + / -
  • Ctrl+Up/Down: speed + / -
  • -> / <-: seek forward / backward
  • Drag and drop a media file to player
  • Wheel: zoom in/out

Before QtAV 1.3.1, the default behavior can be replaced by subclassing QObject and call void AVPlayer::setPlayerEventFilter(QObject *obj) (use null to disable).


Read for detail.


Use QtAV in QML with OpenGL shaders(example is from qtmultimedia. But qtmultimedia is replaced by QtAV)

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QtAV on Mac OS X

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IP camera using QtAV. OS: Fedora 18 (some developers from Italy

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QMLPlayer on ubuntu


Video Wall

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Donate 资助


#####What are the financial needs of QtAV?

  • Buy hardware for developing and testing purpose. (lack of AMD card now)


Now I have received 1050 RMB(about 160$)


PayPal Paypal

Support via Gittip

Gittip Gittip

Copyright © Wang Bin

Shanghai University->S3 Graphics, Shanghai, China


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