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MediaElement Windows Phone 8.1 does not play links to resources

MediaElement Windows Phone 8.1 does not play links to resources, for example http://kgot-fm.akacast.akamaistream.net/7/449/31707/v1/auth.akacast.akamaistream.net/kgot-fm, but plays links. mp3. Windows 8 running all references. What's the problem? and how to fix it? the same code.
//only works in windows 8.1
<MediaElement x:Name="MediaElement"
Source="http://kgot-fm.akacast.akamaistream.net/7/449/31707/v1/auth.akacast.akamaistream.net/kgot-fm"
AutoPlay="True" Margin="199,320,114,252" Width="100" Height="100"/>
//works in windows 8, and in windows phone 8.1
<MediaElement x:Name="MediaElement"
Source="http://radio02-cn03.akadostream.ru:8114/businessfm96.mp3"
AutoPlay="True" Margin="199,320,114,252" Width="100" Height="100"/>

If you subscribe to MediaElement.MediaFailed:
MediaElement.MediaFailed += MediaElement_MediaFailed;
then you will see that using the first link you get:
MF_MEDIA_ENGINE_ERR_SRC_NOT_SUPPORTED : HRESULT - 0xC00D2EE0
which means (HRESULT) that:
0xC00D2EE0 NS_E_UNKNOWN_PROTOCOL
The specified protocol is not supported.
The list of supported audio and video formats you will find here.

from the c# set the string as uri
MediaElement.Source = new Uri("http://kgot-fm.akacast.akamaistream.net/7/449/31707/v1/auth.akacast.akamaistream.net/kgot-fm");

Windows phone 8 placeholder issue with Windows Phone Toolkit

I'm developing a windows phone 8 app. I'm new to windows phone 8 development.
I need to add placeholder for text box . I searched in Google & Stack Overflow i got one solution by using The windows phone Toolkit.
I try with following Code.
Step-1: Add Windows Phone Toolkit In Reference By Using Nuget gallery
Step-2: Add namespace in page header
xmlns:xtk="using:WinRTXamlToolkit.Controls"
Step-3: My Textbox XAML code
<TextBox Name="Usernametxt" Text="User Name"></TextBox>
<TextBox Name="Passwordtxt" Text="Password"></TextBox>
<TextBox Name="Emailtxt" Text="Eamail Address"></TextBox>
Step-4: I add the following code under the Usernametxt box [I don't know it's correct or not]
<xtk:WatermarkTextBox WatermarkText="some text" />
I got error in above line The Name WatermarkTextBox does not exist in namespace"using:WinRTXamlToolkit.controls"
I got this solution Here
I don't know how to use this property . I need to add placeholder for 4 to 5 textbox in same page.
Help me to solve this problem.

You are mixing up Windows Phone 8 and Windows 8.
You need a reference to correct toolkit
xmlns:toolkit="clr-namespace:Microsoft.Phone.Controls;assembly=Microsoft.Phone.Controls.Toolkit"
And then you can
<toolkit:PhoneTextBox Hint="some text" Name="Usernametxt" />
Make sure you can got the right Nuget package, more details here.

Locating and reading a file stored locally

I have a metro app and I have added an existing file into a folder inside solution explorer. I have read the resources docs on msdn but can't get it figured out.
My sound file is located in Assets\SFX\Standard.wav, so how would I locate and play this file using MediaElement in my app from codebehind?

I am not sure why you would want to use MediaElement, perhaps you could try SoundPlayer?
System.Media.SoundPlayer player = new System.Media.SoundPlayer();
player.SoundLocation = "\Assets\SFX\Standard.wav";
player.Play();
Edit with MediaElement:
<MediaElement Name="TehSoundz" IsLooping="False" AutoPlay="False" Height="0" Width="0" Source="\Assets\SFX\Standard.wav" />
Codebehind:
TehSoundz.Play();
TehSoundz.Stop();

WinRT C# Play a viddler video using MediaElement

I am trying to play a Viddler video in my application but i cant get it to work.
Here is my simple code:
XAML:
< MediaElement VerticalAlignment="Center" Visibility="Visible"
HorizontalAlignment="Center"
Name="myMediaElement" Height="350"
Width="640" />
And my c#:
myMediaElement = new MediaElement();
Uri url = new Uri("http://www.viddler.com/embed/5b17d44f/");
myMediaElement.Source = url;
myMediaElement.Play();
Any help would be great! When i arrive on the page, nothing happens, the application does not break it just does nothing....
Edit:
In the end I have just decided to call the http://www.viddler.com/embed/5b17d44f/ url into a Webview, its not the best idea but it works.

Dont create a new MediaElemet. You already have one created (XAML).
Set AutoPlay="True" in your XAML
Edit: Play works only if the media is already loaded.

Image Control asynchronous

I have an image control that I want it to load the image asynchronously over the network. I see some sample code in the network saying something like:
<Image HorizontalAlignment="Left" Height="118" Margin="2,8,0,0" VerticalAlignment="Top" Width="167" x:Name="ImageThumbnail" Source="{Binding SummaryImageLink, IsAsync=True}" />
However, in Windows Phone 7, I cannot find anything like that. Does anybody know a way to do that without I have to code a lot myself

Unfortunately you are going to have to write, or include, more code yourself to do this properly. I have a similar solution with the goal to cache images after the first download. The image cache class is accessed via a IValueConverter, so once you have included the appropriate code, you only have to add a decorator on the Image object:
<Image Source="{Binding ElementName=ImageSource, Path=Text, Converter={StaticResource imageCacheConverter}}" Width="200" />
Full details here and source code here: http://www.ben.geek.nz/2010/07/one-time-cached-images-in-windows-phone-7/

David Anson's work with LowProfileImageLoader may be of interest to you.
Keep a low profile [LowProfileImageLoader helps the Windows Phone 7 UI thread stay responsive by loading images in the background] - Delay's Blog

Alternatively you can asynchronously download the picture (for ex. with a BackgroundWorker) and assign it as source for your image control only when the download has completed.