Re: Preserve pitch
Re: Preserve pitch
- Subject: Re: Preserve pitch
- From: Chris Rogers <email@hidden>
- Date: Wed, 1 Jun 2005 11:59:06 -0700
Jan,
Although it is possible to do this directly in QuickTime, currently
this is only using the low-quality time-stretching algorithm.
Using the AUTimePitch unit directly will allow use of the high-
quality algorithm as well. This may or may not be important
in your particular application, so using QuickTime directly may be a
simpler and more direct solution to your problem....
Chris Rogers
Core Audio
On Jun 1, 2005, at 8:15 AM, Greg Chapman wrote:
If I understand what you're trying to do, you can do this with
QuickTime 7 fairly simply. We use the AUPitch unit for scaled
edits, so all you need to do is take the audio from one movie, and
paste it (scaled) into another movie. Come on over to quicktime-
api, and get the details.
Greg Chapman
QuickTime Engineering
On May 31, 2005, at 11:59 PM, Cynthia Bruyns wrote:
Hello all,
I am new to Core Audio and would like to take a movies sound and
stretch the duration preserving pitch.
I understand Tiger has an audio unit for this, but I don't know
its subtype.
aufx tmpt appl - Apple: AUPitch
Presumably I have to start an audio extraction session, feed the
data to the audio unit and write to a file. What is the simplest
way to write to a file?
Does an audio unit exist that writes to a file?
This thread has some good pointers: http://lists.apple.com/
archives/Coreaudio-api/2005/May/msg00251.html
BTW, I don't think such a thing as an movie audio addition API
exists, does it? So I will have to copy the sound file to the
movie in the end.
Or you could use SoundTrack Pro and use the plug-in in the movie
editing environment.
http://www.apple.com/finalcutstudio/soundtrackpro/
TIA,
Jan
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