Video QML 類型

用於展示指定視頻的方便類型。更多...

import 語句：	import QtMultimedia
繼承：	Item

所有成員列錶，包括繼承成員

特性

bufferProgress : real
duration : int
error : enumeration
errorString : string
fillMode : enumeration
hasAudio : bool
hasVideo : bool
loops : int
metaData : mediaMetaData
muted : bool
orientation : int
playbackRate : real
playbackState : enumeration
position : int
seekable : bool
source : url
volume : real

信號

errorOccurred ( error , errorString )
paused ()
playing ()
stopped ()

方法

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

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.

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 視頻 .

Notice that because signals for the Keys have been defined pressing the:

Spacebar toggles the pause button.
Left Arrow moves the current position in the video to 5 seconds previously.
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.

另請參閱 MediaPlayer and VideoOutput .

特性文檔編製

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:

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

Determines how often the media is played before stopping. Set to MediaPlayer .Infinite to loop the current media file forever.

默認值為 1 。把此特性設為 0 不起作用。

metaData : mediaMetaData

This property holds the meta data for the current media.

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

另請參閱 mediaMetaData .

muted : bool

此特性保持音頻輸齣是否靜音。

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.

position : int

此特性保持當前的迴放位置 (以毫秒為單位)。

seekable : bool

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

若 true，調用 seek () method or changing the position property 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)。

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 QAudio::convertVolume () 瞭解更多細節。

信號文檔編製

errorOccurred ( error , errorString )

此信號發射，當 error 齣現。 errorString parameter may contain more detailed information about the error.

注意： 相應處理程序是 onErrorOccurred .

paused ()

此信號發射，當暫停迴放時。

注意： 相應處理程序是 onPaused .

playing ()

This signal is emitted when playback is started or continued.

注意： 相應處理程序是 onPlaying .

stopped ()

此信號發射，當停止迴放時。

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 .

另請參閱 seekable and position .

stop ()

停止媒體迴放。