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 has been added to FFmpeg projects page http://ffmpeg.org/projects.html

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
OSD
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, XV and OpenGL.

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

FFmpeg Latest version is recommanded.
Qt 4 or 5
PortAudio v19

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

Build

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

Here is a brief guide:

It's recommend not to build in source dir.

cd your_build_dir
qmake QtAV_source_dir/QtAV.pro
make

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, delete .qmake.cache and run qmake again

WARNING: If you are in windows mingw with sh.exe environment, you may need run qmake twice.

Known Issues

Debug library name may be wrong, you should manually rename the generated library to the name that compiler complains.

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

For End Users

Player Usage

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

player [-vo qt|gl|d2d|gdi|xv] [url/path]filename

You can choose a paint engine with -vo option. For example, in windows that support Direct2D, you can run

player -vo d2d filename

The default is Qt's paint engine.

Default Shortcuts

Ctrl+O: open a file
Space: pause/continue
F: fullscreen on/off
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 + / -
-> / <-: 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

Component framework
Subtitle
Filters
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

Stylish GUI based on Qt Graphics View Framework
Document and SDK
Other: play speed, better sync method and seeking, tests, playing statistics, etc.
Region of interest support.
More platform support. Maemo, Android, iOS, BB10 etc. Depends on Qt and FFmpeg for those platforms.
Try to write decoders myself.