• Adobe After Effects

  picture jumps during the horizontal pan

  Posted by Serkan Ertekin on June 16, 2009 at 12:15 am

  Hi everybody,

  I would be very happy if anyone can share their thoughts about the following problem I am having:

  I am making a quicktime movie that will be for web use (mainly streaming but also downloadable).
  The movie has parts where I have a camera that pans horizontally and shows still images of objects. Imagine a horizontal movement in a museum.

  The problem is that, even though I don’t see any jumps in the after effects RAM preview, I always see some after I render the composition. Plus, even though they look like they happen on the same spot every time i play, I guess they are not, cause if I go to the jump and play it from there, then the jumps happen slightly later. This tells me that the problem is coming from compression?

  I think it may also be caused by the sped of the movement, but i am trying not to change that, instead I am in search of a good compression that can solve it.

  So far I’ve been experimenting with h264. My composition is 30fps, I also tried to bring it up to 60fps, the general motion got a lot smoother but I am still seeing jumps.

  Any help would be greatly appreciated.

  Thanks in advance!

  Sonja

  Serkan Ertekin replied 17 years, 2 months ago 2 Members · 2 Replies
• 2 Replies

• 

  Todd Kopriva

  June 16, 2009 at 1:30 pm

  It sounds to me like the problem might be either the video player (QuickTime Player?) our your hard disk struggling to keep up with playback. If you’ve used a codec that requires a lot of processing power to decode, then you can see stuttery playback on a computer of even moderate power. The same goes for high-data-rate movies played from a hard disk that isn’t quite fast enough.

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  Todd Kopriva, Adobe Systems Incorporated
  putting the ‘T’ back in ‘RTFM’ : After Effects Help on the Web
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• 

  Serkan Ertekin

  June 17, 2009 at 5:44 am

  Thanks for taking time on replying Todd,

  I actually rendered a few tests that are quite small sized quicktimes, around 4-5MBs but still the problem is there.
  I also tried to optimize my pictures and adding some motion blur, but none of these helped really.

  when you said “codec that requires a lot of processing power to decode”, do you think h264 or sorenson3 is one of those?

  Thanks

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