• Adobe After Effects

  Jerky playback after rendering to .avi

  Posted by Cathy Ralph on May 27, 2007 at 4:24 am

  Hi Gang,

  I’m working with AE 6.5 in 1920 x 1080 (HD) at 30 FPS, 8 Bit
  I have a simple 4 layer animation over 150 frames, where I’m moving into the scene using the -Z- axis. I’ve applied Easy Ease to all keyframes. The background is a sky that moving only in the -X- axis and is not a 3D layer.

  The RAM preview looks great – but when it’s rendered out to an .avi file it plays back really jerky. It’s jerky in all the axis’s, not just the -Z-. Has anyone ever seen this before? Could this be because of the file size being HD?

  I’m running on a Dell XPS 410, 3 Gig RAM, Dual Core processor

  Thanks for any help you can offer!

  Cathy Ralph replied 18 years, 11 months ago 2 Members · 3 Replies
• 3 Replies

• 

  John Terry

  May 27, 2007 at 7:23 am

  did you tried to rendering it in small resolutions to check up if same problem appear?.

  if ram preview is ok, it’s probably codec problem.

  jo_graphix
  http://www.graphixmotion.com
• 

  Cathy Ralph

  May 27, 2007 at 11:56 am

  No – I’m going to try that experiment today. I’m rendering out with no compression, so I don’t think it’s a codec problem. I’ve always worked at 720 x 480 and never seen this problem before. That’s why I suspect it may be the file size. Thanks!
• 

  Cathy Ralph

  May 27, 2007 at 12:33 pm

  HURRAY!! I discovered what the problem was!
  I was rendering out at no compression. So I systematically applied one codec after another and test rendered until I found the one that works! MPEG4! What I find interesting is that depending on what codec I chose for the output module, I’d get different results – like Cinepac would render smooth motion on foreground items but not background items – weird, huh?
  Thanks to all who scratched their heads on this one!
  -Cathy

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