Help On Speed Up Sound Effect

[Jerry Hofmann]

First thing I’d try is speeding up the audio all by itself… This is sound sync sound tied to a video track, right?

Jerry

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[Bret Williams]

There’s probably not anymore sound left if you sped it up 1000%. Why don’t you just duplicate it and loop it as many times as you need.

[Thaxter Clavemarlton]

[Bret Williams] “Why don’t you just duplicate it and loop it as many times as you need.”

Well, that would be fine if Wong was SLOWING DOWN the sound.

But speeing it UP 10 times (1000%), would make it 10 times SHORTER (as you said, mostly NOT THERE).

So there would be no need to “loop it”… that would make it LONGER.

But it might be useful to just speed up the original sound by TWO times (200%) and cutting it OFF (editing it down) to a very short section.

[Bret Williams]

???? Yeah. That’s what I said. He said he sped it up. Which makes it shorter. Which is why the audio is ending before the video. What part did you miss? If you don’t also speed up the video… (he didn’t say) then the audio is going to end first. Which was his problem. So that’s why he’d loop it. To fill the void left by making it shorter.

[Vladimir Lozinski]

Just thought.
Maybe.
If you speed up a sound you raise its pitch. Doubling raises it an octave.
Ifyou raise 2 khz tone by 1000% it can be heard by dogs but not you.
Vladimir.

[Thaxter Clavemarlton]

[Bret Williams] “He said he sped it up. Which makes it shorter. Which is why the audio is ending before the video. What part did you miss?”

Whoa there, why are you so angry about this?

Here’s the OP question:
[Wong Kwang Han] “I increase the speed of a clip to 1000% to get the speed up effect. The video is fine but the clip becomes silent after the initial one or two seconds”

This is how I read it:

1. He sped up “the clip” (Audio and Video)
2. The video is fine, but the audio (at 10 times speed) disappears (of course).

[Wong Kwang Han] “The high pitch speed up sound effect is crucial to what I want.”

He want’s the audio to be “sped-up” so the high-speed video has “sped-up” audio to go with it.
Since nobody (including dogs) could hear most frequencies sped up by a factor of 10 anyway, I suggested just using “2-times” to get a “useable” effect and, of course, it would have to be cut down to fit a very short video clip.

If you read something else, OK.
Holiday shopping getting to ya, Bret?

[Wong Kwang han]

Thanks for your suggestions. Here’s what happened.
Tried speeding up the sound apart from the video, no difference.
Tried increasing the speed at different rates, as suggested 200% and so on, discover the max i can go without losing sound is 380%, which sounds more like what I want than at 200%. however there are gaps in between as sometimes the person is not talking, so i’m cutting and pasting sound from excess footage to get a consistence, squeaking sound to a few minutes of 1000% speed up video.
im not sure if the speeding up loses the sound because when i play the 1000% speed up video clip and stop and play along the timeline i get the high pitch sound everytime i stop and play again, along which ever part of the timeline. could be a software issue with FCP4