Why do some videos appear distorted or grainy?

I have first generation iPad. Why do some videos appear distorted or grainy? Is there a fix for this? I am using only WiFi portion of product.

What videos? You may be viewing some very low-resolution videos.

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The iPad is less than 3 weeks old. it is already the second. The first was a 16 GB this one is a 32 GB. no difference. This issue does not happen with only one website but other posted videos from other websites.

This and other answers helped me to understand better why I cannot view these videos and search for answers. I found that the videos posted by this website end in .cfm, and doing research cfm is Adobe and is not compatible with apple software ? why this is not resolved is surprising to me - Several other people experience the same issue as I (dating 2007-to 2013) I am not computer literate but I know how to find information on the web and know +or - how to use the programs. There seems to be nothing that will convert these videos into a format that the iPad could process and allow. should I buy quicktime for my windows device and transfer/sync it to the ipad (?)(3 weeks old I paid $900) will this work. I have tried to upgrade the firmware to my router but no luck there either; even following all the steps religiously. the unzip is not working? I get a file the upgrade button rejects.
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The problem in a video: Flash CS6 audio problem - YouTube

here is my problem described in a video:
Flash CS6 audio problem - YouTube
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Are all clips from exactly the same source, using exactly the same settings?
Read Bill Hunt on a file type as WRAPPER http://forums.adobe.com/thread/440037?tstart=0
What is a CODEC... a Primer http://forums.adobe.com/thread/546811?tstart=0
What CODEC is INSIDE that file? http://forums.adobe.com/thread/440037?tstart=0

Why do some videos appear distorted or grainy?

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