On 12 Oct 2004 04:30:45 GMT, 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.

Playing an analogue tape slower would shift pitch as well as change
length. Though with a change of this tiny magnitude, it's hardly an
issue.

"Audio ahead of video" implies that they just need aligning. But you
mean the overall lengths are different and you really have an audio
file that, though aligned to video at the start, ends up 1 sec.
behind?

1 sec. in two hours. That's a tiny ratio. I'm not sure that any wave
editor will accept a resampling factor of 0.9998611 and, if it did,
do anything useful with it.

Within the 2 hours of audio, can you find 10 places where you could
unobtrusively insert 0.1 sec of silence (or paste in that amount of
ambient sound, if more appropriate? Would that get things near
enough?

CubaseFAQ www.laurencepayne.co.uk/CubaseFAQ.htm
"Possibly the world's least impressive web site": George Perfect