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QtAV

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. Currently only a simple player is supplied. I will write a stylish one based on QtAV in the feature.

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

Features

QtAV can meet your most demands

  • Seek, pause/resume
  • Video capture
  • Aspect ratio
  • Transform video using GraphicsItemRenderer. (rotate, shear, etc)
  • Playing frame by frame (currently support forward playing)
  • Variant streams: locale file, http, rtsp, etc.
  • Playing music (not perfect)
  • Volume control
  • Fullscreen, stay on top
  • Compatible: QtAV can be built with both Qt4 and Qt5. QtAV will support both FFmpeg and Libav.
  • Multiple render engine support. Currently supports QPainter, GDI , Direct2D.

Extensible Framework (not finished)

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 audio output class using OpenAL, image converting class using cuda to get better performance etc. These features will be added in the feature by default.

For Developers

Requirements

  1. FFmpeg Latest version is recommanded.
    FFmpeg
  2. Qt 4 or 5
    Qt
  3. PortAudio v19
    PortAudio LogoPortAudio

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

Build

For most platforms, just

qmake
make

If the above command failed to build it, try

cd your_build_dir

qmake QtAV_dir/QtAV.pro -r BUILD_DIR=your_build_dir

make

The binaries will be created in $BUILD_DIR/bin. If you are using QtCreator to build the project, you should go to Projects->Build Steps->qmake->Additional arguments, add "BUILD_DIR=your/buid/dir"

To build with direct2d support, you should add additional arguments to qmake CONFIG =direct2d, or add it in src/libQtAV.pro.

Build with MSVC

See the wiki Compile with MSVC

How To Write a Player

Wrtie a media player using QtAV is quite easy.

WidgetRenderer renderer;
renderer.show();
AVPlayer player;
player.setRenderer(&renderer);
player.play("test.avi");

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

Default Shortcuts

  • Space: pause/continue
  • F: fullscreen on/off
  • T: stays on top on/off
  • N: show next frame. Continue the playing by pressing "Space"
  • O: open a file
  • P: replay
  • S: stop
  • R: switch aspect ratio
  • M: mute on/off
  • Up / Down: volume / -
  • -> / <-: seek forward / backward
  • Drag and drop a media file to player

The default behavior can be replaced by subclassing QObject and call void AVPlayer::setPlayerEventFilter(QObject *obj) (use null to disable).

TODO

  1. Component framework
  2. Subtitle
  3. Filters
  4. Hardware acceleration using DirectX, NVIDIA Cuda, ATI UVD, Intel IPP, OpenCL and OpenGL:
  • decoding: DXVA, XvBA, cuvid
  • image, audio and filters
  • rendering: DirectX, XV, OpenGL
  1. Stylish GUI based on Qt Graphics View Framework
  2. Document and SDK
  3. Other: play speed, better sync method and seeking, tests, playing statistics, etc.
  4. Region of interest support.
  5. More platform support. Maemo, Android, iOS, BB10 etc. Depends on Qt and FFmpeg for those platforms.
  6. Try to write decoders myself.

Screenshots

QtAV on Win8

Alt text

QtAV on Mac OS X

Alt text

IP camera using QtAV. OS: Fedora 18 (some developers from Italy http://www.selcomsrl.eu/)

Alt text

Rotate a video item

Alt text

Video Wall

Alt text

Copyright © Wang Bin [email protected]

Shanghai University, Shanghai, China

2013-01-21