keyframe slow-mo with audio

[mike909]

Anyone care to share their favorite method of achiving good slow motion, including audio?
I really like After Effects Timewarp, for video, but it does not apply the timewarp to audio. What I have been doing is rendering the video and then editing the audio seperately in Audition. Kind of a pain, and AE's animation controll is preferable. I have also been dropping the video into Premier and using it's 'speed' function...but that can't be easily animated (keyframed). Time remapping in AE works on audio, and that can be keyframed, but that effect doesn't give you the controll over the video that the 'timewarp' effect does.
I have been getting by with the afforementioned techniques, for those times that I desire slow-mo effect, but I figured there is probably a better workflow to it. Keep in mind, I desire the capability to not only achieve slow-motion, but do be able to animate in and out of it (like a turntable losing power, then regaining it.)

[bobkart]

WMM can slow down a clip to half speed, including audio, using one of its effects. Repeated applications can get you any power-of-two slowing-down effect.

I have written audio processing applications (16-bit stereo WAV files) and one can slow down the audio to half speed. With just a tiny bit more effort I could have an application that can slow down a WAV file to virtually any factor of the original speed.

EDIT: Oh just read the part about "animate in and out" of the slowdown. That's certainly more challenging. If I were to write audio and video processing applications that could achieve such effects, I would tackle it by breaking up the effect into "steady" and "changing" portions of slowdown, and apply such effects to each part of the audio and video that needed each kind of effect (I can also slow down and speed up video with similar applications to my audio processing ones). This would be tedious if repeated more than just a few times in the course of a project though.

[mike909]

Thanks for the post bob,
Unfortunately, WMM does not offer the level animation/keyframing I would like in my project. In fact, if I remember correctly (ive only used wmm once or twice for it's 'old video' effect) you can't animate effects at all...just apply them to the whole clip. Doesn't get me the "turntable losing/regaining power" effect that I like to achieve. Also, I'm unsure of how well it interprets the footage to create the slow-mo video...i.e does it just slow down the frames, or does it actually recreate pixels like AE.?

[bobkart]

WMM will just duplicate frames to achieve the slow-down effect.

I edited my post after reading the later part of yours talking about transitioning from normal to slow speed and back ("animate in/out"). That's going to be challenging I suspect.

[mike909]

WMM will just duplicate frames to achieve the slow-down effect....
...transitioning from normal to slow speed and back ("animate in/out"). That's going to be challenging I suspect.

Ya, that's what I thought on the WMM. As far as the animation goes, AE does a great job with it (as it should), just doesn't handle the audio as well.

[guns1inger]

Vegas' Velocity Envelope allows you to ramp in and out, and even slow down to the point of reversing the clip, all using simple points on the timeline.

Arguably the two best applications for this would be Twixtor and ReTimer, plugins for After Effects

[mike909]

yea, the timewarp effect in AE can ramp in/out/reverse as well; but your saying Vegas Velocity applies the 'ramping' to the audio also?
I have read about Twixtor, it's been out for a while, but the latest ver. of AE's Timewarp effect was supposed to accomplish what Twixtor had in the past. Of course, if Twixtor works on audio as well, then it's still better. I will do some more reading, and look up ReTimer also. Thanks.

[guns1inger]

I suspect that AE's timewarp is probably a licensed (or bought out) version of ReTimer or similar.

[mike909]

Vegas' Velocity Envelope allows you to ramp in and out, and even slow down to the point of reversing the clip, all using simple points on the timeline.

....and in Vegas, the ramping in/out/revers applies to the audio of the track also?

[mike909]

Twixtor does NOT remap audio with it's video. I couldn't tell from the website, so I downloaded a demo of the latest Twixtor. It does not apply it's remapping to audio (though the video renders faster with it than with AE's built in timewarp). Guess I will try to look into ReTimer now.

[mike909]

did the same thing for ReTimer. Nope, doesn't remap audio either. hmmm...