Question

我有一个视频（持续时间：3秒），我需要创建2个状态

1-视频应始终达到第二个1.5并从头开始播放。

TimeSpan ts = new TimeSpan(0, 0, 0, 1, 500);
TimeSpan ts_Start = new TimeSpan(0, 0, 0, 0, 0);
if (mediaElement.position == ts)
  mediaElement.position = ts_Start; //doesnt work this block code

2-按下按钮时，视频应播放完整视频（3秒）。（简单标志，布尔）

所以我的问题是，我怎么知道什么时候mediaelement.position = 1.5 seconds ?? ....我想到了一种方法，比如玩游戏等等。

Answer 1

如果您获得MediaElement的{{1}}属性，则可以附加到Clock事件并观察时间达到1.5秒。该事件具有很高的精确度（即它经常被提升），所以除非必须，否则你不想做太多的事情来回应事件。

Answer 2

我解决了问题...... :) :) ....

我决定使用其他论坛的许多想法让我自己申请。

我的解决方案比我计划的容易，我使用了2个视频，2个mediaElements，一个mediaEnded事件和一个布尔变量来查看视频......

并且完美无缺！ Solution are here ------＆gt; （解决方案和评论）

在我的应用程序中，我不必使用诸如clock，TimeLines，DispatcherTimer或任何事件（如CurrentTimeInvalidate）之类的属性，我只使用MediaEnded事件和布尔变量。：）不再。我有2个视频（1.5秒和3秒）。当MediaEnded（媒体1,5秒）mediaElement1,5sec.Position = TimeSpam.Zero;和MediElement3sec.Position = TimeSpam.Zero，当我点击按钮时，我只评估变量（布尔值）并播放3秒的完整视频。

但是，源代码在这里：MainWindow.xaml

<Window x:Class="wpf_TestVideos.MainWindow"
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    Title="MainWindow" Height="371" Width="525" Loaded="Window_Loaded">
<Grid>
    <MediaElement Height="268" HorizontalAlignment="Left" Margin="141,12,0,0" Name="mediaElement15sec" VerticalAlignment="Top" Width="237" MediaEnded="mediaElement15sec_MediaEnded" />
    <MediaElement Height="268" HorizontalAlignment="Left" Margin="142,12,0,0" Name="mediaElement3sec" VerticalAlignment="Top" Width="236" />
    <Button Content="Load" Height="34" HorizontalAlignment="Left" Margin="12,286,0,0" Name="btLoad" VerticalAlignment="Top" Width="73" Click="btLoad_Click" />
    <Button Content="Inicio Juego" Height="23" HorizontalAlignment="Left" Margin="128,286,0,0" Name="btStart" VerticalAlignment="Top" Width="86" Click="btStart_Click" />
    <Button Content="&quot;Reconoce Gesto&quot;" Height="23" HorizontalAlignment="Left" Margin="285,286,0,0" Name="btGesture" VerticalAlignment="Top" Width="108" Click="btGesture_Click" />
</Grid>

MainWindow.xaml.cs：

using System;
using System.IO;
using System.Collections;
using System.Collections.Generic;
using System.Diagnostics;
using System.Windows;
using System.Windows.Forms;
using System.Windows.Media;
using System.Windows.Media.Imaging;
using System.Windows.Shapes;
using System.Windows.Controls;
using System.Windows.Data;
using System.Windows.Documents;
using System.Windows.Input;
using System.Windows.Navigation;
using System.Linq;
using System.Text;
using System.Runtime.InteropServices;
using System.Windows.Interop;
using System.Windows.Media.Animation;
using System.Threading;

namespace wpf_TestVideos
{
    /// <summary>
    /// Interaction logic for MainWindow.xaml
    /// </summary>
public partial class MainWindow : Window
{
    public MainWindow()
    {
        InitializeComponent();
    }

    string VideoLocation = System.IO.Path.GetDirectoryName(System.Windows.Forms.Application.ExecutablePath);
    string sFileName = "";
    string sFileName2 = "";
    bool bVideoLoop = true;
    TranslateTransform trans = new TranslateTransform();

    private void btLoad_Click(object sender, RoutedEventArgs e)
    {
        mediaElement15sec.LoadedBehavior = MediaState.Manual;
        mediaElement3sec.LoadedBehavior = MediaState.Manual;
        btGesture.IsEnabled = true;
        btStart.IsEnabled = true;
        btLoad.IsEnabled = false;
        DirectoryInfo df = new DirectoryInfo(VideoLocation);
        if (df.Exists)
        {
            sFileName = VideoLocation + @"\Krown_test_loop.mov";
            mediaElement15sec.Source = new Uri(sFileName);
            mediaElement15sec.Stretch = Stretch.Fill;
            sFileName2 = VideoLocation + @"\Krown_test_7.mov";
            mediaElement3sec.Source = new Uri(sFileName2);
            mediaElement3sec.Stretch = Stretch.Fill; 
        }
        else
        {
            System.Windows.Forms.MessageBox.Show("No se puede cargar el video", "TestAll");
        }
    }

    private void btStart_Click(object sender, RoutedEventArgs e)
    {
        mediaElement15sec.Position = TimeSpan.Zero;
        mediaElement3sec.Position = TimeSpan.Zero;
        mediaElement15sec.Play();
        mediaElement3sec.Play();
        bVideoLoop = true;
        //VisualStateManager.GoToState(mediaElement15sec, "Bring1,5ToFront", true);
    }

    private void mediaElement15sec_MediaEnded(object sender, RoutedEventArgs e)
    {
        if (bVideoLoop)
        {
            mediaElement15sec.Position = TimeSpan.Zero;
            mediaElement3sec.Position = TimeSpan.Zero;
        }
    }

    private void btGesture_Click(object sender, RoutedEventArgs e)
    {
        bVideoLoop = false;
        //Animacion_Opacidad(bVideoLoop);
        //VisualStateManager.GoToState(mediaElement3sec, "Bring300ToFront", true);
    }

    private void Animacion_Opacidad(bool bLoop)
    {
        mediaElement15sec.RenderTransform = trans;
        if (!bLoop)
        {
            DoubleAnimation anim1 = new DoubleAnimation(1, 0, TimeSpan.FromSeconds(1));
            trans.BeginAnimation(OpacityProperty, anim1);
        }
    }

    private void Window_Loaded(object sender, RoutedEventArgs e)
    {
        btGesture.IsEnabled = false;
        btStart.IsEnabled = false;
        btLoad.IsEnabled = true;
    }


}

}

如何在播放时比较MediaElement的确切位置

2 个答案: