Video QML Type▲
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Import Statement: import QtMultimedia
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Inherits:: Item
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Group: Video is part of multimedia_qml, multimedia_video_qml
Detailed Description▲
Video is a convenience type combining the functionality of a MediaPlayer and a VideoOutput into one. It provides simple video playback functionality without having to declare multiple types.
The following is sample code to implement video playback in a scene.
Video {
id: video
width : 800
height : 600
source: "video.avi"
MouseArea {
anchors.fill: parent
onClicked: {
video.play()
}
}
focus: true
Keys.onSpacePressed: video.playbackState == MediaPlayer.PlayingState ? video.pause() : video.play()
Keys.onLeftPressed: video.position = video.position - 5000
Keys.onRightPressed: video.position = video.position + 5000
}The source file, video.avi, plays when you click the parent of MouseArea. The video plays in an area of 800 by 600 pixels, and its id property has the value video.
Notice that because signals for the Keys have been defined pressing the:
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Spacebar toggles the pause button.
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Left Arrow moves the current position in the video to 5 seconds previously.
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Right Arrow advances the current position in the video by 5 seconds.
Video supports un-transformed, stretched, and uniformly scaled video presentation. For a description of stretched uniformly scaled presentation, see the fillMode property description.
See Also▲
See also MediaPlayer, VideoOutput
Property Documentation▲
bufferProgress : real▲
This property holds how much of the data buffer is currently filled, from 0.0 (empty) to 1.0 (full).
duration : int▲
This property holds the duration of the media in milliseconds.
If the media doesn't have a fixed duration (a live stream for example) this will be 0.
error : enumeration▲
This property holds the error state of the video. It can be one of:
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MediaPlayer.NoError - there is no current error.
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MediaPlayer.ResourceError - the video cannot be played due to a problem allocating resources.
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MediaPlayer.FormatError - the video format is not supported.
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MediaPlayer.NetworkError - the video cannot be played due to network issues.
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MediaPlayer.AccessDenied - the video cannot be played due to insufficient permissions.
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MediaPlayer.ServiceMissing - the video cannot be played because the media service could not be instantiated.
errorString : string▲
This property holds a string describing the current error condition in more detail.
fillMode : enumeration▲
Set this property to define how the video is scaled to fit the target area.
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VideoOutput.Stretch - the video is scaled to fit
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VideoOutput.PreserveAspectFit - the video is scaled uniformly to fit without cropping
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VideoOutput.PreserveAspectCrop - the video is scaled uniformly to fill, cropping if necessary
Because this type is for convenience in QML, it does not support enumerations directly, so enumerations from VideoOutput are used to access the available fill modes.
The default fill mode is preserveAspectFit.
hasAudio : bool▲
This property holds whether the current media has audio content.
hasVideo : bool▲
This property holds whether the current media has video content.
loops : int▲
Determines how often the media is played before stopping. Set to MediaPlayer.Infinite to loop the current media file forever.
The default value is 1. Setting this property to 0 has no effect.
metaData : mediaMetaData▲
This property holds the meta data for the current media.
See MediaPlayer.metaData for details about each meta data key.
See Also▲
See also mediaMetaData
muted : bool▲
This property holds whether the audio output is muted.
orientation : int▲
The orientation of the Video in degrees. Only multiples of 90 degrees is supported, that is 0, 90, 180, 270, 360, etc.
playbackRate : real▲
This property holds the rate at which video is played at as a multiple of the normal rate.
playbackState : enumeration▲
This read only property indicates the playback state of the media.
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MediaPlayer.PlayingState - the media is playing
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MediaPlayer.PausedState - the media is paused
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MediaPlayer.StoppedState - the media is stopped
The default state is MediaPlayer.StoppedState.
position : int▲
This property holds the current playback position in milliseconds.
seekable : bool▲
This property holds whether the playback position of the video can be changed.
If true, calling the seek() method or changing the position property will cause playback to seek to the new position.
source : url▲
This property holds the source URL of the media.
volume : real▲
This property holds the audio volume.
The volume is scaled linearly from 0.0 (silence) to 1.0 (full volume). Values outside this range will be clamped.
The default volume is 1.0.
UI volume controls should usually be scaled nonlinearly. For example, using a logarithmic scale will produce linear changes in perceived loudness, which is what a user would normally expect from a volume control. See QAudio::convertVolume() for more details.
Signal Documentation▲
errorOccurred(error, errorString)▲
This signal is emitted when an error has occurred. The errorString parameter may contain more detailed information about the error.
The corresponding handler is onErrorOccurred.
paused()▲
This signal is emitted when playback is paused.
The corresponding handler is onPaused.
playing()▲
This signal is emitted when playback is started or continued.
The corresponding handler is onPlaying.
stopped()▲
This signal is emitted when playback is stopped.
The corresponding handler is onStopped.