• Adobe After Effects

  Looping sound by markers

  Posted by Jagi88 on January 1, 2006 at 3:49 pm

  Hi. First of all, sorry for my english (I’m just learing :P). I saw here tutorial about Synchronizinig Animation to Audio…

  https://forums.creativecow.net/cgi-bin/new_page_wrapper.cgi?forumid=2&page=https://www.creativecow.net/articles/ebberts_dan/audio_sync/index.html

  In this tutorial, markers are used to synchronize animation… but is it posible to synchronize audio to animation… For example: I have movie with men who is walkin, and i have sound of step. Now, I can place my sound in timeline when men’s foot is placed on the ground. But if men makes 20 steps I will need 20 layers with the same sound… I want to use only one layer with sound of step and make the same effect… Is It posible?

  hehehe, I think I made a lot of mistakes in this post 😛

  Mike Clasby replied 20 years, 4 months ago 4 Members · 4 Replies
• 4 Replies

• 

  Steve Roberts

  January 1, 2006 at 6:22 pm

  You could try this:

  1. Add markers (* on the numeric keypad) to the footage layer, indicating where each footstep occurs
  2. Apply time remapping to your “single-footstep” audio layer.
  3. Extend the out-point of the audio layer to the end of the comp.
  4. Convert the second keyframe to a hold keyframe (right-click on the keyframe and select “toggle hold keyframe”)
  5. Move one frame to the right and scrub the time-remap value (drag the value with the mouse) so it reads 0. This will “rewind” the playback of your sound to the beginning.
  6. Select these 3 keyframes and Copy them.
  7. Move to the next frame where the footstep occurs and Paste the 3 keyframes. Do a RAM preview to test.
  8. If it works, go ahead and Paste the 3 keyframes where each footstep occurs (at each marker).

  I just tried this, so it works. 🙂

  If the footstep sound is too long for the time available between footsteps, you may need to create 2 footstep audio layers: one for the left foot, and one for the right foot.

  Good luck, and Happy New Year!
  Steve
• 

  Filip Vandueren

  January 1, 2006 at 9:37 pm

  Here’s the expression-way:

  1. Add markers (* on the numeric keypad) to the footage layer, indicating where each footstep occurs
  2. Apply time remapping to your “single-footstep” audio layer.
  3. Extend the out-point of the audio layer to the end of the comp.

  4. Give the time-remapping property of the sound-layer this expression:
  
l=thisLayer; // change this to the layer that has the markers. just select 'thisLayer' and then pickwhip to the layer.

  t=0; i=0;

  if (l.marker.numKeys) {
m=l.marker.nearestKey(time);
i = m.index-((m.time>time) ? 1 : 0);
t= (i==0 ? 0 : l.marker.key(i).time);
}
if (i>0) {
time-t;
}


  That should do the trick.
  If you actually apply the markers to the Audio-layer, you don’t need to change the first line of the expression.
• 

  Filip Vandueren

  January 2, 2006 at 12:41 am

  Just a quick repost, because the comment in line 1 wrapped after posting: that would have given errors.

  to recap:
  use this code on the audiolayer,
  if you have the markers on another layer, change the first line.

  
l=thisLayer;
t=0; i=0;

  if (l.marker.numKeys) {
m=l.marker.nearestKey(time);
i = m.index-((m.time>time) ? 1 : 0);
t= (i==0 ? 0 : l.marker.key(i).time);
}
if (i>0) {
time-t;
}


  Steve’s suggestion of using 2 different footsteps is a good idea BTW.
• 

  Mike Clasby

  January 3, 2006 at 8:58 pm

  Wow, that is great stuff, thanks mucho.

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