LogFAQs > #932247193

Energy Surge posted...

Compression wouldn't cause this at all. <snip>

why not? that's exactly the kind of thing compression does to simplify the image to compress it.

here's an example. things to notice include:

• the edges of the back wheel of the other bike are almost but not quite stationary, while the middle of the wheel is very clearly in motion. this is because the pattern on the edge repeats, and the compression is turning something that's "pretty close" to something that's exact. the middle of the tire is messy enough that the pattern doesn't repeat frame to frame, so the compression ignores it.
• even better, at times the rubber on the top of his front tire appears completely motionless. this isn't (just) because it's in synch with the camera, it's because the image on each frame look "pretty close" to the compression, so it converts it into something that's exact frame to frame.

https://www.youtube.com/watch?v=GBUJtUKk5KA&t=25m22s

for the helicopter, you're not literally getting raw frames that look identical frame to frame, you're getting frames that look similar frame to frame and the compression converts it into something that looks identical.

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