Poor quality when rendering CC Particle Systems II

Hi Guys.
I'm getting strange render results when I render out CC Particle Systems II cubes and tetrahedrons.
I have the particles cascading out towards the viewer and they look great when I preview render in AFX but when I do a full render to H.264 mp4 they start really crisp and clear then turn in to a really pixelated mess as the render continues. It's odd. I tried rendering through Adobe media encoder but it's the same. I also tried just rendering the particle part of the comp and it does the same thing. Am I missing some settings?
Any help would be greatly appreciated.
Thanks

Without seeing it in motion, it sounds like normal issues you would experience with an interframe compression scheme like H.264
H.264 works on the principle of a few full frames scattered among a bunch of incomplete frames with interpolated data. Your first frame would be a keyframe with full data and that middle frame would be one that's incomplete. The reason it looks worse when the particles are on the screen is that there's also a lot more data happening. In the rest of your project, the compression is barely noticeable. This is an issue any time you are trying to design for broadcast or the web. Heck, you can even see this kind of artifacting in major releases. See, for example, the Planet Earth Blu-ray in any of the shots involving a massive flock of birds. You can see compression artifacts despite the pristine quality you would expect from them. There's only so much data you can squeeze out of a frame (to make it easily playable) before certain artifacts will creep in.
You can either redesign to make it less likely to have artifacts when compressed or you can rest assured that most normal people won't even notice something like this as it flies past them on the screen.
Now, this is all assuming your particles are moving quickly. If it looks like that with slow, smooth motion, something else may be wrong.

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Message was edited by: Brandon Rohde

Brandon,
I suspect we are missing a few factors in your situation. Let me ask a few questions and make a suggestion or two so we can figure this thing out.
1) What is the make and model of your TV?
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9) Now, play it in an external DVD player on am SD television. How does it look?
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Poor quality when rendering CC Particle Systems II

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