Multimedia¶
A set of APIs for working with audio, video, radio and camera devices
A set of APIs for working with audio, video, radio and camera devices.
Multimedia support in Qt is provided by the Qt Multimedia module. The Qt Multimedia module provides a rich feature set that enables you to easily take advantage of a platform’s multimedia capabilities such as media playback and the use of camera and radio devices.
Features¶
Here are some examples of what can be done with Qt Multimedia APIs:
Access raw audio devices for input and output
Play low latency sound effects
Play media files in playlists (such as compressed audio or video files)
Record audio and compress it
Tune and listen to radio stations
Use a camera, including viewfinder, image capture, and movie recording
Play 3D positional audio with Qt Audio Engine
Decode audio media files into memory for processing
Accessing video frames or audio buffers as they are played or recorded
Multimedia Components¶
Qt’s multimedia APIs are categorized into four main components. More information (including background information and class references) is available here:
Multimedia Recipes¶
For some quick recipes, look at the overviews above and consult this table:
Use case
Examples
QML Types
C++ Classes
Playing a sound effect
QSoundEffect
Playing low latency audio
audioinput , spectrum
QAudioOutput
Playing encoded audio (MP3, AAC etc)
player
Audio , MediaPlayer
QMediaPlayer
Accessing raw audio input data
spectrum , audioinput
QAudioInput
Recording encoded audio data
audiorecorder
QAudioRecorder
Discovering raw audio devices
audiodevices
QAudioDeviceInfo
Video Playback
player , qmlvideo , qmlvideofx
MediaPlayer , VideoOutput , Video
QMediaPlayer, QVideoWidget, QGraphicsVideoItem
Video Processing
qmlvideofx
MediaPlayer , VideoOutput
QMediaPlayer, QAbstractVideoSurface, QVideoFrame
Listening to the radio
declarative-radio
Radio , RadioData
QRadioTuner, QRadioData
Accessing camera viewfinder
camera , declarative-camera
Camera , VideoOutput
QCamera, QVideoWidget, QGraphicsVideoItem
Viewfinder processing
Camera , VideoOutput
QCamera, QAbstractVideoSurface, QVideoFrame
Capturing photos
camera , declarative-camera
QCamera, QCameraImageCapture
Capturing movies
camera , declarative-camera
QCamera, QMediaRecorder
3D sound sources
Audio Engine
AudioEngine , Sound
Limitations¶
The Qt Multimedia APIs build upon the multimedia framework of the underlying platform. This can mean that support for various codecs or containers can vary between machines, depending on what the end user has installed.
Advanced Usage¶
For developers wishing to access some platform specific settings, or to port the Qt Multimedia APIs to a new platform or technology, see Multimedia Backend Development .
Changes from Previous Versions¶
If you previously used Qt Multimedia in Qt 4, or used Qt Multimedia Kit in Qt Mobility, please see Changes in Qt Multimedia for more information on what changed, and what you might need to change when porting code.
Reference Documentation¶
QML Types¶
The QML types are accessed by using:
import QtMultimedia 5.8The following types are accessed by using Qt Audio Engine :