Qt Documentation

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Video QML Type

A convenience type for showing a specified video. More...

Import Statement: import QtMultimedia 5.14
Inherits:

Item

Properties

Signals

Methods

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.

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.seek(video.position - 5000)
    Keys.onRightPressed: video.seek(video.position + 5000)
}

Video supports untransformed, stretched, and uniformly scaled video presentation. For a description of stretched uniformly scaled presentation, see the fillMode property description.

See also MediaPlayer and VideoOutput.

Property Documentation

audioRole : enumeration

This property holds the role of the audio stream. It can be set to specify the type of audio being played, allowing the system to make appropriate decisions when it comes to volume, routing or post-processing.

The audio role must be set before setting the source property.

Supported values can be retrieved with supportedAudioRoles().

The value can be one of:

customAudioRole is cleared when this property is set to anything other than CustomRole.

This property was introduced in Qt 5.6.


autoLoad : bool

This property indicates if loading of media should begin immediately.

Defaults to true, if false media will not be loaded until playback is started.


autoPlay : bool

This property determines whether the media should begin playback automatically.

Setting to true also sets autoLoad to true. The default is false.


availability : enumeration

Returns the availability state of the video instance.

This is one of:

ValueDescription
MediaPlayer.AvailableThe video player is available to use.
MediaPlayer.BusyThe video player is usually available, but some other process is utilizing the hardware necessary to play media.
MediaPlayer.UnavailableThere are no supported video playback facilities.
MediaPlayer.ResourceMissingThere is one or more resources missing, so the video player cannot be used. It may be possible to try again at a later time.

bufferProgress : real

This property holds how much of the data buffer is currently filled, from 0.0 (empty) to 1.0 (full).


customAudioRole : string

This property holds the role of the audio stream when the backend supports audio roles unknown to Qt. It can be set to specify the type of audio being played, allowing the system to make appropriate decisions when it comes to volume, routing or post-processing.

The audio role must be set before setting the source property.

audioRole is set to CustomRole when this property is set.

This property was introduced in Qt 5.11.


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:

  • MediaPlayer.NoError - there is no current error.
  • MediaPlayer.ResourceError - the video cannot be played due to a problem allocating resources.
  • MediaPlayer.FormatError - the video format is not supported.
  • MediaPlayer.NetworkError - the video cannot be played due to network issues.
  • MediaPlayer.AccessDenied - the video cannot be played due to insufficient permissions.
  • 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.

  • VideoOutput.Stretch - the video is scaled to fit
  • VideoOutput.PreserveAspectFit - the video is scaled uniformly to fit without cropping
  • 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

This property holds the number of times the media is played. A value of 0 or 1 means the media will be played only once; set to MediaPlayer.Infinite to enable infinite looping.

The value can be changed while the media is playing, in which case it will update the remaining loops to the new value.

The default is 1.

This property was introduced in Qt 5.9.


metaData : object

This property holds the meta data for the current media.

See MediaPlayer.metaData for details about each meta data key.

See also QMediaMetaData.


muted : bool

This property holds whether the audio output is muted.


notifyInterval : int

The interval at which notifiable properties will update.

The notifiable properties are position and bufferProgress.

The interval is expressed in milliseconds, the default value is 1000.

This property was introduced in Qt 5.9.


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.

The default state is MediaPlayer.StoppedState.


playlist : Playlist

This property holds the playlist used by the media player.

Setting the playlist property resets the source to an empty string.

This property was introduced in Qt 5.6.


position : int

This property holds the current playback position in milliseconds.

To change this position, use the seek() method.

See also seek().


seekable : bool

This property holds whether the playback position of the video can be changed.

If true, calling the seek() method will cause playback to seek to the new position.


source : url

This property holds the source URL of the media.

Setting the source property clears the current playlist, if any.


status : enumeration

This property holds the status of media loading. It can be one of:

  • MediaPlayer.NoMedia - no media has been set.
  • MediaPlayer.Loading - the media is currently being loaded.
  • MediaPlayer.Loaded - the media has been loaded.
  • MediaPlayer.Buffering - the media is buffering data.
  • MediaPlayer.Stalled - playback has been interrupted while the media is buffering data.
  • MediaPlayer.Buffered - the media has buffered data.
  • MediaPlayer.EndOfMedia - the media has played to the end.
  • MediaPlayer.InvalidMedia - the media cannot be played.
  • MediaPlayer.UnknownStatus - the status of the media cannot be determined.

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 QtMultimedia.convertVolume() for more details.


Signal Documentation

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.


Method Documentation

pause()

Pauses playback of the media.


play()

Starts playback of the media.


seek(offset)

If the seekable property is true, seeks the current playback position to offset.

Seeking may be asynchronous, so the position property may not be updated immediately.

See also seekable and position.


stop()

Stops playback of the media.


supportedAudioRoles()

Returns a list of supported audio roles.

If setting the audio role is not supported, an empty list is returned.

This method was introduced in Qt 5.6.

See also audioRole.


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