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Jamie Oliver table tennis effect


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Ummm....by a computer? Isn't that rather obvious?

 

It's probably a blend of two techniques - they'll be compositing the video of Jamie on top of a real video of the ball going back and forth between 4 players, then using computer animation to fill in the gaps and make sure that the ball hits Jamies paddle.

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CGI all the way. The 'ball' appears to be composited onto the footage of Jamie and the other two players. It's movement is a good model of the real thing but not perfect.

 

Basically, shoot loads of footage of the three players pretending to play. Pick the best sequence. Go through shot by shot adding in keyframes for the motion path. Add in the 'ball'. Tweak the ball where it makes contact with surfaces.

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The balls are moving so fast that at 25fps full screen size there's not actually much of them visible. The tricky bit is managing the perspective changes as the camera moves to put him into the scene - that's what impressed me!
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Yes they certainly didn't make it easy for themselves having a moving camera shot, especially one moving relatively erratically compared to a simple pan, track or zoom, although I guess if you keyframe the point they hit each bat, then as long as it doesn't move too much in between the software will fill in the gap.
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The moving camera is generally in the same orientation though after the initial movement around the table. Adobe After Effects has the tracker feature, so you could happily track onto the corner of the table from that, so it would automatically move its own internal 3d world along with it, and thus any 3D layers you had. Very handy feature to have! This makes the erratic movements fairly easy to get rid of in software, and with a pretty good result usually.

 

As paulears mentioned, the motion blur used in the effect means that the animation doesn't have to be amazingly precise either to still make it look realistic. Theres very little actually visible of the ball, and it's just a hint of the ball in each frame.

 

And I'll second what Brian said, it'll be the video of the three guys faking, and the ball added on top of that layer, rather than there being three layers ( background / ball / Jamie). Trying to overlay Jamie on top of two other guys playing would be even more work

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Sound op alert!

 

Don't ignore the addition the sound effects make to adding to the reality of this. Turn off the sound, watch again critically and the faults with the digital video effects stand out rather more. "Hearing" the ball on table and bat goes a long way towards helping to fool the senses!

 

As for the "ball behind the net" this only comes into play for the odd frame or two every so often. Frankly, it would likely be quickest just to "net" it manually each time it happens....effectively just a bit of photoshopping.

 

Bob

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