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  1. Member
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    Jul 2004
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    The good news is that my WM Extender still works fine and all my other PC's work fine playing these same mp4 with WMP & WMC. I have assumed that I've lost a vital codec but I've had no luck figuring out the problem codec.

    Any suggestions on how to approach this problem ?
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  2. I'm a MEGA Super Moderator Baldrick's Avatar
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    Aug 2000
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    I hope you aren't running win98se....winxp?

    Maybe just try install ffdshow.
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  3. Member
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    Wow, I actually got it working again !!!

    At first things got worse, and I couldn't play .avi files in addition to my original problem with only mp4 files. Internet Explorer and Windows Explorer were also starting to crash frequently.

    First I applied MS Fix It for corrupt video codec causing crashes. Then I uninstalled all codec packs & programs. Then I ran a registry cleaner. Then I ran sfc /scannow. Then I installed codec packs (32 & 64 bit components because I have a x64 Win 7 PC). Remembering that everyone advises to do as little as possible when working with codec, I carefully read the installation guide and it said if you have mp4 problems disable Media Foundation on the 32 bit MP4 tab.

    Bingo, both WMP & WMC play mp4 files perfectly.
    Last edited by satwar; 11th Apr 2014 at 10:10.
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