Leonid Makarovsky wrote:
I have a 2 hour WAV file that I need to make 1 second longer. I was
doing
the video capture and audio was ahead of video by 1 second factor.

So I need to stretch it without losing quality. The effect should be
the
same as if I played an analog cassette tape a bit slower. The reason
I'm asking
is that I had never had problems with squeezing WAV file (i.e. making
them
shorter). But I once tried to stretch the WAV file in GoldWave sound
editor
and artifacts such as clicks and distortion were introduced in sound.
Any way
to do it without artifacts? Thanks.

--Leonid

PS. The WAV file is 16 bit 48kHz.

Hi Leonid.

You specified that the audio is ahead by 1 second. So, are you sure you
need to stretch the audio? Do you mean that the audio starts off
in-sync but that by the end of the playout the audio is ahead by a
second? Otherwise all you need to do is re-align the audio with the
video.

If you, indeed, you need to stretch the audio by 1 second then that
amounts to .013% change (very little for sure). I have used the the
time-stretch facilities in ProTools, Nuendo and Logic. And each should
be able to perform the change inaudibly (as long as you specify the
highest quality setting vs operational speed).

Regards,
Hassan