• Adobe Premiere Pro

  Slow Motion Clips Losing Audio Sync

  Posted by Nate Hanson on October 18, 2010 at 6:52 am

  I’ve been killing myself on this all day…can’t find a solution.

  Software: Adobe Premiere Pro CS4
  Footage: 1280×720 60p from a T2i (H.264)
  Audio: Straight from the camera at 48000 Hz – 16 bit – stereo

  I’ve got a 3 minute clip that I’m slowing down to 50% in several places. Regular speed – slow – regular – slow…etc.

  The clip is 60p, but I’ve placed it in a 30p sequence with frame blending turned off.

  I’m using time remapping in Premiere to change the speed. All the speed changes are hard changes from 100% to 50% over one frame, no ramping.

  For the audio, I’m cutting it into clips at the same time that I mark my keyframes, then I change the audio speed to 50% for that clip. It lines up and plays exactly as I want it to in my timeline.

  Once I export (doesn’t matter how…I’ve exported a hundred times today with various settings), the audio is always a second or so off track during the slow motion portions.

  1) Is the problem with the h.264 footage? I’m editing it natively in CS4. (I’ve also converted to I-frame m2v before using time remapping, but I got the same result)

  2) Is the problem with the audio?

  3) Is the problem with Premiere’s time remapping or speed change function?

  Thanks for any help,

  Nate Hanson
  Pilothouse Films

  Nate Hanson replied 15 years, 7 months ago 1 Member · 0 Replies
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