• Adobe After Effects

  Timewarp misconceptions

  Posted by Chris Wright on June 18, 2008 at 8:25 pm

  Timewarp misconceptions and Andrew Kramer’s plugin and workflow.

  I saw Andrew Kramer’s video and I was wondering what was really going on. His formula says to reinterpret 29.97i to 23.976i conform and then speed up again the footage in timewarp. but timewarp is actually Kronos from foundry. Here’s what they have to say about it.

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  To maintain this information in a accessible manner you need to pop your fielded clip in a composition of double the frame rate. Thus for our 25fps PAL DV clip, create a 50fps composition. Now when you look at composition frame 1 you see the lower field of frame 1 of the DV clip, looking at the composition frame 2 you see the upper field of frame 1 from the DV clip; comp frame 3 = lower field dv frame 2 and so forth.

  Using this double frame rate composition allows Kronos / Timewarp to access the information in the second field and thus give an improved retime result with less temporal and spacial smudging. Obviously, you can then drop this into a lower frame rate output comp and field as necessary. It’s a little difficult to show the improvement on a compressed static shot as much of it results in smoother temporal transitioning, but the below pics should give you some idea.

  from: (pics are included)
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  https://support.thefoundry.co.uk/cgi-bin/yabb2/YaBB.pl?num=1140098384
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  So, Andrew is speeding up footage at 125% because he interpreted it slow. That’s exactly what PAL conforms do, they slow down a conform 25 to 23.976. hmmm…

  So, he’s losing vertical lines and slowing down footage before it even hits timewarp. That’s less information from a single scanline and less information from a slower framerate. Tell me I’m wrong.

  Chris Wright replied 17 years, 11 months ago 1 Member · 0 Replies
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