Microsoft KB Archive/938872

= Error message when you try to view a Live Meeting 2005 recording: &quot;Media Player has encountered an error and cannot play this file - possible codec error&quot; =

Article ID: 938872

Article Last Modified on 11/12/2007

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APPLIES TO


 * Microsoft Office Live Meeting 2005

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SYMPTOMS
When you try to view a Microsoft Office Live Meeting 2005 recording, you receive an error message that resembles the following error message:

Media Player has encountered an error and cannot play this file - possible codec error



CAUSE
This issue occurs when Windows Media Player cannot establish a successful connection to the streaming media server to stream the recording file.



RESOLUTION
To resolve this issue, follow these steps:  Exit all Microsoft programs, and then close all additional program windows that may be open. Install the latest Microsoft Windows Media codec. To do this, visit the following Microsoft Web site:

http://www.microsoft.com/windows/windowsmedia/forpros/format/codecdownload.aspx

 Restart the computer. Start Windows Media Player. On the Tools menu, click Options. Click the Network tab, and then click to clear the UDP check box in the Streaming protocols area. Click Apply, and then click OK.</li> Exit Windows Media Player.</li> Try to view the Live Meeting 2005 recording.</li></ol>

Note This issue may occur if you install Windows Media Player 10 before you install Microsoft Windows XP Service Pack 2 (SP2). In this case, you must reinstall the correct Windows Media Player version for the operating system.

To install the Windows Media Player version that you want, visit the following Microsoft Web site:

http://www.microsoft.com/windows/windowsmedia/default.mspx

Then, repeat steps 4 through 9 to test connectivity and to test the streaming of the Live Meeting recording.

<div class="moreinformation_section">

MORE INFORMATION
Windows Media Player tries to connect to the streaming media server by using the following network transport protocols in the order in which they are listed:
 * UDP
 * TCP
 * HTTP

When Windows Media Player cannot connect to the streaming media server by using the UDP network transport protocol, you receive the error message that is mentioned in the &quot;Symptoms&quot; section. Additionally, Windows Media Player cannot connect to the streaming media server.

Windows Media Player may be unable to connect to the streaming media server by using the UDP network transport protocol because of Internet devices such as firewalls, proxy servers, NAT devices, and other devices.

When you disable the UDP streaming protocol option, Windows Media Player uses the TCP network transport protocol and the HTTP network transport protocol to connect to the streaming media server. In this case, Windows Media Player is successful in connecting to the streaming media server.

This occurs because many Internet devices do not allow incoming or outgoing UDP access. Therefore, when you disable the UDP streaming protocol option, you remove the possibility of connectivity issues.

Additional query words: 1113 media player error codec

Keywords: kbexpertisebeginner kbtshoot KB938872

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