Looping sound by markers

[Steve Roberts]

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]

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]

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]

Wow, that is great stuff, thanks mucho.