Question

Tried binding Maximum value of slider to media element’s duration and binding slider’s current value to the position of media element, but but for some reasons it doesn’t.

I want the slider to move it’s thumb while the video is playing.

<Slider x:Name="videoSlider" Value="{Binding ElementName=mp3MediaElement, Path=Position}" 
ValueChanged="videoSlider_ValueChanged" IsMoveToPointEnabled="True" 
Maximum="{Binding ElementName=mp3MediaElement, Path=NaturalDuration}" 
AllowDrop="True" DataContext="{Binding ElementName=mp3MediaElement}" />

Answer 1

I didn’t use binding..
I had a similar issue and used timer for this (My code is in Silverlight by it suppose to be the same on WPF):

First direction (movie updates the slider)

private TimeSpan TotalTime;

private void MyMediaElement_MediaOpened(object sender, RoutedEventArgs e)
        {
            TotalTime = MyMediaElement.NaturalDuration.TimeSpan;

            // Create a timer that will update the counters and the time slider
            timerVideoTime = new DispatcherTimer();
            timerVideoTime.Interval = TimeSpan.FromSeconds(1);
            timerVideoTime.Tick += new EventHandler(timer_Tick);
            timerVideoTime.Start();
        }

void timer_Tick(object sender, EventArgs e)
        {
            // Check if the movie finished calculate it's total time
            if (MyMediaElement.NaturalDuration.TimeSpan.TotalSeconds > 0)
            {
                if (TotalTime.TotalSeconds > 0)
                {
                    // Updating time slider
                    timeSlider.Value = MyMediaElement.Position.TotalSeconds /
                                       TotalTime.TotalSeconds;
                }
            }
        }

Second direction (user updates the slider)
on form ctor or something like this write the following line:

timeSlider.AddHandler(MouseLeftButtonUpEvent, 
                      new MouseButtonEventHandler(timeSlider_MouseLeftButtonUp), 
                      true);

and the event handler is:

private void timeSlider_MouseLeftButtonUp(object sender, MouseButtonEventArgs e)
        {
            if (TotalTime.TotalSeconds > 0)
            {
                MyMediaElement.Position = TimeSpan.FromSeconds(timeSlider.Value * TotalTime.TotalSeconds);
            }
        }