Video QML 類型

用於展示指定視頻的方便類型。更多...

import 語句：	import QtMultimedia 5.15
繼承：	Item

所有成員列錶，包括繼承成員

特性

audioRole : enumeration
autoLoad : bool
autoPlay : bool
availability : enumeration
bufferProgress : real
customAudioRole : string
duration : int
error : enumeration
errorString : string
fillMode : enumeration
flushMode : enumeration
hasAudio : bool
hasVideo : bool
loops : int
metaData : object
muted : bool
notifyInterval : int
orientation : int
playbackRate : real
playbackState : enumeration
playlist : Playlist
position : int
seekable : bool
source : url
status : enumeration
volume : real

信號

paused ()
playing ()
stopped ()

方法

pause ()
play ()
seek ( offset )
stop ()
supportedAudioRoles ()

詳細描述

視頻 is a convenience type combining the functionality of a MediaPlayer 和 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)
}

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

另請參閱 MediaPlayer and VideoOutput .

特性文檔編製

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.

可以檢索支持的值，采用 supportedAudioRoles() .

值可以是之一：

MediaPlayer .UnknownRole - the role is unknown or undefined.
MediaPlayer .MusicRole - music.
MediaPlayer .VideoRole - soundtrack from a movie or a video.
MediaPlayer .VoiceCommunicationRole - voice communications, such as telephony.
MediaPlayer .AlarmRole - alarm.
MediaPlayer .NotificationRole - notification, such as an incoming e-mail or a chat request.
MediaPlayer .RingtoneRole - ringtone.
MediaPlayer .AccessibilityRole - for accessibility, such as with a screen reader.
MediaPlayer .SonificationRole - sonification, such as with user interface sounds.
MediaPlayer .GameRole - game audio.
MediaPlayer .CustomRole - The role is specified by customAudioRole .

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

該特性在 Qt 5.6 引入。

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 。默認為 false .

availability : enumeration

Returns the availability state of the video instance.

This is one of:

值	描述
MediaPlayer .Available	The video player is available to use.
MediaPlayer .Busy	The video player is usually available, but some other process is utilizing the hardware necessary to play media.
MediaPlayer .Unavailable	There are no supported video playback facilities.
MediaPlayer .ResourceMissing	There 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.

該特性在 Qt 5.11 引入。

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.

flushMode : enumeration

Set this property to define what 視頻 should show when playback is finished or stopped.

VideoOutput .EmptyFrame - clears video output.
VideoOutput .FirstFrame - shows the first valid frame.
VideoOutput .LastFrame - shows the last valid frame.

The default flush mode is EmptyFrame.

該特性在 Qt 5.15 引入。

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 以啓用無限循環。

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

默認為 1 .

該特性在 Qt 5.9 引入。

metaData : object

This property holds the meta data for the current media.

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

另請參閱 QMediaMetaData .

muted : bool

此特性保持音頻輸齣是否靜音。

notifyInterval : int

The interval at which notifiable properties will update.

須申報特性是 position and bufferProgress .

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

該特性在 Qt 5.9 引入。

orientation : int

The orientation of the 視頻 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.

MediaPlayer .PlayingState - the media is playing
MediaPlayer .PausedState - the media is paused
MediaPlayer .StoppedState - the media is stopped

The default state is MediaPlayer .StoppedState.

playlist : Playlist

此特性保持用於媒體播放器的播放列錶。

設置播放列錶特性重置 source 成空字符串。

該特性在 Qt 5.6 引入。

position : int

此特性保持當前的迴放位置 (以毫秒為單位)。

要改變此位置，使用 seek() 方法。

另請參閱 seek() .

seekable : bool

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

若 true，調用 seek() method will cause playback to seek to the new position.

source : url

此特性保持媒體的源 URL (統一資源定位符)。

Setting the source property clears the current playlist ，若有的話。

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

此特性保持音頻音量。

按綫性比例縮放的音量是從 0.0 (無聲) 到 1.0 (全音量)。將鉗製超齣此範圍的值。

默認音量為 1.0 .

通常，UI 音量控件應按非綫性比例縮放。例如，使用對數比例縮放將産生感知響度的綫性變化，這通常是用戶期望的音量控製。見 QtMultimedia.convertVolume() 瞭解更多細節。

信號文檔編製

paused ()

此信號發射，當暫停迴放時。

相應處理程序是 onPaused .

注意： 相應處理程序是 onPaused .

playing ()

This signal is emitted when playback is started or continued.

相應處理程序是 onPlaying .

注意： 相應處理程序是 onPlaying .

stopped ()

此信號發射，當停止迴放時。

相應處理程序是 onStopped .

注意： 相應處理程序是 onStopped .

方法文檔編製

pause ()

暫停媒體迴放。

play ()

開始媒體迴放。

seek ( offset )

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

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

另請參閱 seekable and position .

stop ()

停止媒體迴放。

supportedAudioRoles ()

返迴支持的音頻角色列錶。

若不支持設置的音頻角色，返迴空列錶。

該方法在 Qt 5.6 引入。

另請參閱 audioRole .