Videos flicker and judder! Why?

When starting a video on youtube or somewhere else, every video flickers and judders. What is here the problem? Thx.

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Safari ▹ Preferences... ▹ Privacy ▹ Remove All Website Data
and confirm. Test.
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    #3. Why is the conversion so slow? Please speed it, you have the power. Convenience is the thing that sells products.
    #4. Files that cannot be played on the current iPod need to be easier recognized for simpler cleaning.
    #5. Also make an easier way to select all dead link files for faster cleaning, deleting, etc. This one is important.
    #6. Make a user friendly way to change where my files are going to end up once I convert them for iPod more options and better customizable settings are need.
    #7. One of the most important is ADD A SEARCH OPTION. I and we classics will LOVE Apple for it.
    For you readers, I apologize for the long post, and any grammatical errors you might find throughout it. These are problems that I have faced with these programs and hardware and I wanted to make sure they got acknowledged and hopefully addressed. Any information about why I cannot play MP4 Video files on my iPod would be the best. If anything in my post gets answered that’s the one I want most. Will save me a lot of hassle.
    Thank you all and I look forward to your suggestions and comments. All are welcome and appreciated.
    Sincerely,
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