Re: Audio Running faster then Video
Re: Audio Running faster then Video
- Subject: Re: Audio Running faster then Video
- From: Niel Warren <email@hidden>
- Date: Wed, 10 Aug 2005 20:47:27 -0700
While it is possible to put in a good time stretching algorithm in the
audio path,
a high fidelity implementation will consume a good amount of processor.
Not running a high fidelity algorithm will result in noticeable audio
artifacts.
On the other hand, the eye is extremely forgiving of timing jitter.
Sliding
the rendering of the video frame a few 10s of microseconds one way or
is totally unnoticeable and much cheaper (in terms of processor).
You are much better off slaving the video to the series of time stamps
that CoreAudio presents you. If you cannot bump the video frame by a
small amount
of time you are still better off (from an audio fidelity perspective)
dropping
a whole video frame or repeating one. This is how
24 frame per second film is shown on 30 frame per second TV. Every
6th frame is repeated. You don't notice.
-Niel
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