This video was rendered in AE CS6. H.246 codec from mpeg format.
Pink logo is a psd file. Text at the end was done in AE added glow to it. Audio in stereo at 44000 layers were precomposed the second time to see if the white and pixelation would happen again. Didn't seem to help.
Preview it plays back fine.
MPEG is not an ideal production/intermediate/working format.
It is hopeful that the pixels in the MPEG file do not show similar artefacts. You should convert the MPEG file to a production/intermediate/working format and use this version of the source footage in the timeline. Hopefully you will have no issues.
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Also, rendering directly to H.264 from Ae is not recommended. Either render a high-quality intermediate and compress that, or use Adobe Media Encoder to render the Ae composition directly to H.264.
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