how do compare a exactly position of MediaElement while playing

Question

i have a single video (duration: 3 seconds) and i need to create 2 states

1- the video should always reach the second 1.5 and play it from the start.

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- when i press a button, the video should play the full video (3 seconds). (simple flag, boolean)

so my question is, how do i know when the mediaelement.position = 1.5 seconds ??.... i thought of a method such as playing or something like that.

Answer 1

The accepted solution seems to be more a workaround than a solution.. what in case once you will need to use not 1.5 but another time, eg. 2.5 seconds? will you have to change the videos? The solution could be using a DistpatcherTimer:

DispatcherTimer timer = new DispatcherTimer();
timer.Interval = TimeSpan.FromSeconds(1.5); // your time
timer.Tick += timer_Tick;
timer.Start();
mePlayer.Play(); // run timer and player at same time

When the timer_Tick is reached just set the position to zero and call Play() again:

void timer_Tick(object sender, EventArgs e)
{
    mePlayer.Position = new TimeSpan(0, 0, 0, 0);
    mePlayer.Play();
}

And when clicking the second button, detach the timer (... can be attached later when necessary):

timer.Tick -= timer_Tick;

Answer 2

i resolved the problem... :) :) ....

i decide make me own application with many ideas that had taken of other forums.

My solution was easier than i planned, i used 2 videos, 2 mediaElements, a mediaEnded event and boolean variable to chage the video....

and works perfectly! Solution are here ------> (Solution, and coments)

in my app, i didn't have to use properties like clocks, TimeLines, DispatcherTimer, or any event like a CurrentTimeInvalidate, i just used the MediaEnded event and a boolean variable. :) no more. i have 2 videos (1,5 seconds and 3 seconds). when MediaEnded(media 1,5 seconds) mediaElement1,5sec.Position = TimeSpam.Zero; and MediElement3sec.Position = TimeSpam.Zero, and when i clicked the button, i just evaluated the variable (boolean) and play complet video of 3 seconds.

however, the source code are here: 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;
    }


}

}

Answer 3

If you get the MediaElement's Clock property, you could attach onto the CurrentTimeInvalidated event and watch for the time to hit 1.5 seconds. The event has a lot of precision (i.e. it gets raised VERY often) so you don't want to do too much in response to the event unless you have to.