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使用camera 组件录像遇到视频和声音不同步有延时，录了一段自拍视频，播放是看到说话的口型和声音不匹配，声音提前放了一秒，视频中说话的口型慢一秒，请问怎么解决，谢谢！

<view class="weui-camera-wrap uuid_1538754350_3256-0">

<camera class="weui-camera" mode="normal" device-position="back" flash="off"></camera>

<rich-text nodes='<br />'></rich-text>

<button class="weui-btn weui-btn_primary" type="primary" size="default" bindtap="startRecord">

<text decode="true">开始录像</text>

</button>

<button class="weui-btn weui-btn_primary" type="primary" size="default" bindtap="stopRecord">

<text decode="true">结束录像</text>

</button>

<button class="weui-btn weui-btn_primary" type="primary" size="default" bindtap="saveRecord">

<text decode="true">保存到相册</text>

</button>

<text class="uuid_1538754350_1223-1" decode="true">预览录像</text>

<video class="weui-camera-video-preview" src="{{videoSrc}}" wx:if="{{videoSrc}}"></video>

</view>

Page({

data: {},

onLoad: function(e) {

var that = this;

// 初始化摄像头对象

this.cameraCtx = wx.createCameraContext()

},

startRecord: function() {

// 开始录像

this.cameraCtx.startRecord({

success: function(res) {

wx.showToast({

title: "正在录像",

icon: "loading"

})

}

})

},

stopRecord: function() {

var that = this;

// 结束录像

this.cameraCtx.stopRecord({

success: function(res) {

that.setData({

src: res.tempThumbPath,

videoSrc: res.tempVideoPath

});

wx.showToast({

title: "录像结束"

});

}

})

},

saveRecord: function() {

var that = this;

// 保存录像到相册

wx.saveVideoToPhotosAlbum({

filePath: that.data.videoSrc,

success: function(e) {

wx.showToast({

title: "视频保存成功"

})

}

})

}

})