First, make sure you wait a

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First, make sure you wait a couple of days before you view on youtube. Many people feel that the site puts up a quick compression first so you can see it right away and then later replaces it with a higher quality compressed file.
But it also sounds like you’re running into the camera moving too fast problem. The camera can only capture a certain amount of movement before you get weirdness. Have you tried a slower shutter speed to get more motion blur? Or you you could shoot a big, high-res of the entire scene (stitching if necessary) and pan across it in your editing system.

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