Html 5 video shows pixelated

I have an html video in my website

In firefox it shows pixelated, i converted the .mp4 file to a .webm file.

I don't know what my problem is.

Here is my code:

<video width="640" height="360" controls="controls" poster="video/poster_index.png">
    <source src="video/Pixelprinting.mp4"></source>
    <source src="video/Pixelprinting.webm"></source>
    <source src="video/Pixelprinting.ogv"></source>
    <iframe width="560" height="315" src="" frameborder="0" allowfullscreen></iframe>

You can also watch it live on my website.

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