Windows 8 and 8.1 Forums


Can't Play .mp4 files

  1. #11


    Posts : 7
    Windows 7 x64


    Quote Originally Posted by bobkn View Post
    Can you provide a link to a generally available .mp4 file that won't play for you?

    I'd be willing to see whether it works with my Win8 X64 RP installation. I don't recall installing any video codec packages, but I seem to have the Media Player.
    No I don't right off hand. The files are AVC video in the .mp4 container. If you can find one with AVC somewhere, you can try it out. The ones I have are 100s of MB at the smallest, way too big.

    I think something about this is just screwed up with the Win8 install on this system, and I'm trying to dig around deeper and see if I can figure out what's wrong. Win7 here plays them all just fine, and did straight out of the box with no additional codecs or video players installed.

    I'm tempted to re-install it from scratch and see if the problem still occurs, but I'm going to dig around some more before I do that.

      My System SpecsSystem Spec

  2. #12


    Posts : 636
    Windows 7/8


    Have you updated/installed the "real" video drivers for your video card?

    Codecs often use hardware acceleration for video playback (one reason it can be hard to screen capture) and the drivers that ship with 8 are very bare bones...
      My System SpecsSystem Spec

  3. #13


    Posts : 7
    Windows 7 x64


    I completely uninstalled all video drivers, and now Media Player will indeed play the AVC .mp4 video files (jerky and crap poor performance, of course).

    I had installed Catalyst 12.4. I uninstalled that completely, and that left the "engineering sample" driver that came with Win8 installed. Still wouldn't play. Then I uninstalled that, leaving the basic video, and now it plays.

    I'm going to try installing Catalyst 12.4 on top of this without the "engineering sample" driver in between and see if that works.
      My System SpecsSystem Spec

  4. #14


    Posts : 636
    Windows 7/8


    Good luck Video drivers are definitely still in all kinds of beta for Windows 8 atm...
      My System SpecsSystem Spec

  5. #15


    Posts : 7
    Windows 7 x64


    Yep, it's the hardware acceleration. There's some interaction between whatever changed in Win8 and my hardware and the AMD drivers. I got to playing around and noticed that some Youtube videos wouldn't play as well, displaying a green screen and hanging IE.

    There was no difference in installing the AMD 12.4 drivers directly on top of the bare basic video driver vs the included "engineering sample" driver.

    The only thing I haven't tried is some older AMD drivers, but I've got a hunch that wouldn't help or would probably be worse. AMD has obsoleted this Radeon 4200 chipset, so I fear this won't get fixed for the final release of Win 8 and the only thing is to just get a new video card.

    Thanks to all who replied.
      My System SpecsSystem Spec

  6. #16


    Posts : 1
    Windows NT 4.0


    Please help! I can't play any of these newfangled mp4 video clips! I downloaded all the code packages and only ended up with some might nasty spyware, and think I even may have come down with a Virus! Then I downloaded some free antivirus and it was really a VIRUS! Please help an old man before he takes the old dirt nap.
      My System SpecsSystem Spec

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Can't Play .mp4 files
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