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Re: Preserve pitch
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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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References: 
 >Re: Preserve pitch (From: Cynthia Bruyns <email@hidden>)
 >Re: Preserve pitch (From: Greg Chapman <email@hidden>)

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