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View Thread: changing the .mp4/AVC codec used by IE11?
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    If I play a video on Youtbe the HTML5 player says it's using
    video/mp4; codecs="avc1.64001F, mp4a.40.2"

    Is this codec something you can replace by installing something else?

    IE11 on my computer doesn't like the Youtube HTML5 player and for some reason I can't get the Flash player to work anymore.
    I'm wondering if I can experiment with different codecs to make it work better.