audio speed change

[Captain Mench]

Both will affect quality… It really depends on how far from the original speed you are correcting.

I’m not sure of the specific plugin we’ve used with protools, but for VERY small % changes on professional orchestral CDs we’ve edited it works great.

Now, that said, I’ve had some great results with the FCP filter too… though mainly for speech.

Again, don’t go far… and make sure you are listening on the best possible monitors. You don’t want cheap things coloring the sound after it leaves FCP.

CaptM

[David Roth weiss]

Certainly, speed changes affect pitch. But, its a matter of how much you’re changing the speed. Going from NTSC (30fps) to PAL (25fps) for instance is barely noticeable by those with trained ears.

[David Smith]

Thanks for the response. I think the maximum % change we will be using will be making the audio 99.5 % of its recorded speed. The audio was recorded on a Nagra and we need to make the slight adjustment to sync the files to picture (as they were recorded at different speeds on the Nagra). I just wasn’t sure if it is a downgrade in quality. Thanks.

[Tom Matthies]

Soundtrack Pro has the ability to speed up/slow down tracks and will resample and maintain the proper pitch. It works great to fix those 31-1/2 second tracks cut by on-air radio guys that can’t work a stopwatch. 🙂
Tom

[Michael Gissing]

David,

NTSC to PAL is 4% or three quarters of a semi tone. It is certainly noticable to all but the tone deaf. We use the MPEX 3 algorithim built into Pyramix for changing speed without pitch and it is the best. Changing speed for 30fm versus 29.97fm on a pilot tone nagra tape is insignificant as it is .1%

Don’t worry about using another tool that tries to maintain pitch for such tiny correction. You can use Quicktime to do a 30 – 29.97 change.