Topic: Time Stretch

[Cheesecadet]

I know this has been covered many times over the years, but I am curious if anyone has specific experience with audio stretching using Audacity, Adobe Audition CS5.5, or Wave Editor v1.4.6 on the Mac?

I was 10 feet away from the stacks at a show recently so I need to offset the time approx. 10 milliseconds, but I cannot figure out how to do this where it keeps the pitch and tempo the same in either of the aforementioned editors.

Any help out there?

Thanks in advance!

[achalsey]

Heres the gold standard of guides for doing it in Audacity.  Specifically steps 3-6.  You're mixing two sources together from different recorders I assume?

http://taperssection.com/index.php?topic=103031.msg1373822#msg1373822

[Cheesecadet]

I should clarify, I am trying to sync audio to 720p 30fps video.

I have Final Cut Pro but can't seem to find out how to stretch audio or mess with video in that program so I thought I would ask about the audio.

My particular issue is that even though the camera shoots 720p the audio on it is mono @ 8hz.  What I do is delete the camera audio and splice in the new audio but if a tune is long enough I get the drift issue.

If anyone knows how to manipulate the stretching of audio or video in Final Cut Pro 7...then please let me know as that would be the easiest route.

[achalsey]

Ah, okay.  Well, that seems out of my league.

Best of luck.

[keytohwy]

Ah, okay.  Well, that seems out of my league.

Best of luck.

I assume if you have FCP7, you have the other portions of the FCS, including Soundtrack Pro (STP). 

What I do is bring the video into FC and add it to the timeline.  I then will double click the audio portion and zoom in to a spot I can easily mark, like a cymbal crash, etc., then I mark that spot.  Then I add the secondary audio to the timeline and do the same thing, both at the start and end of the song.  I can now see if the marks line up on the timeline.  If they do not, I see how many frames are needed to make the secondary audio match.  Then I open that audio in Soundtrack Pro.  I select all the audio in STP, and from the Process menu, I choose Time Stretch.  From there I can make the adjustments.  Saving the file and quitting out of STP will result in the files being altered in the FCP timeline nondestructively, of course.  Then you can just delete the primary audio from the timeline and output to your format of choice. 

I hope the above helps.

There is also Singular Software's products which do a really great job.  You can d/l a trial.  I like the standalone version better than the one that works from within FCP.

keytohwy