Downloaded a movie (mpeg-4) from youtube and I only have audio and no video.  it plays on another pc but not this one.  please help.

Hi,
I downloaded the latest free version of quicktime.  I am trying to play a movie (mpeg-4) that was downloaded from youtube.  It plays fine on my other pc, but I only get audio and no video when I open it on this pc. It shows up like static lines on a tv that has bad reception.  Can anyone offer some suggestions please?  I need to play it on thislaptop computer as I require it for a school presentation.  Thank you.

It plays fine on my other pc, but I only get audio and no video when I open it on this pc. It shows up like static lines on a tv that has bad reception.
Open your QuickTime control panel (either via the Control panels, or by going "Edit > Preferences > QuickTime Preferences" in the Quicktime Player). In the Advanced tab, uncheck Enable Direct3D video acceleration:
... and click OK. Quit and restart the QuickTime Player prior to checking to see if the settings change has had any effect.

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