ability to speed up audio tracks on the fly?

[John Peeples]

Here's the situation:

I have a show with an audio track which needs to be sped up twice at various times. The various times depend on the actors timing and will change with each performance so the timing cannot be set in qLab.

The solution I came up with won't work the way I want it to. 

I created a group that starts three audio files at exactly the same time on the 1st 'Go'. One at normal speed, the second slightly faster, the third even faster. The two faster files are silent at first. When the operator wants to speed up she 'Go(s)' with the 1st speed up. qLab silences the 1st file and brings up the 2nd. When she wants to go to the 3rd speed she 'Go(s)' with the 2nd speed up. qLab silences the 2nd speed and brings up the 3rd. (hope this is making sense). It DOES work but because the 2nd two files are already playing faster they don't sync up when they begin to play. 

I cannot think of a way, because these are going to happen at various times for various performances, to get these things to sync up. 

I don't know of a way to get qLab to speed up audio files on the fly.

Any ideas would be helpful. 

[micpool]

use a fade cue to fade the rate

Mic

[Billie]

I had same problem (ie Poe's Tell Tale Heart needed the small thing). I solved the same way but not real satisfying. Curious what solutions folks come up with.

[Chris Ashworth]

HI Billie and John,

As Mic noted, you can do this just by fading the playback rate of the audio or video cue, to whatever speed you want. (With or without changing the pitch of any playing audio.)

If you jump to the 3 minute mark on the video here, you can see an example I did a screen recording of back when we launched v3:

http://figure53.com/docs/qlab/v3/audio/fading-audio/#audio-effects

Best,

C

[Billie]

I get it. Need Pro audio upgrade. Good to know. Thanks.
Billie.

[John Peeples]

So, Yes, solved. With fade cues.

What I ended up doing was this:

1) I started one audio cue then auto-continue thru two more (the same piece of audio). The 2nd two cues start silent. 

2) When I'm ready to speed up the audio I have a fade cue that silences and stops the 1st audio cue, auto-continues, fades up the 2nd audio cue, and fades it's rate up slightly. I also have a fade cue to bring up the rate of the 3rd audio cue to the same speed as the 2nd but it continues to keep it silent so two stay in sync.

3) Now when I'm ready to speed things up again I have a cue that silences and stops the 2nd audio cue, auto-continues, fades up the 3rd audio cue, and fades up the rate a bit more of the 3rd audio cue. 

4) To stop there is another audio cue, an auto-continue, and a quick fade and stop of the 3rd audio cue.

It all works pretty well.

Thanks everybody for the advice

[Mark Valenzuela]

I'm confused about why you need the second and third audio cue. If you're just trying to adjust speed, all you need is a single audio track, and fade cues that target the audio track that has a rate change. If you're trying to change the speed twice, it should be 3 cues - original audio cue, and 2 fade cues that change the speed. Am I missing something?

Mark 

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[Andy Lang]

On Wed, Aug 17, 2016 at 1:19 AM Mark Valenzuela markval...@fastmail.fm wrote:

I'm confused about why you need the second and third audio cue. If you're just trying to adjust speed, all you need is a single audio track, and fade cues that target the audio track that has a rate change. If you're trying to change the speed twice, it should be 3 cues - original audio cue, and 2 fade cues that change the speed. Am I missing something?

I think John’s just misunderstanding and not realizing that fade cues can do more than just fade levels. John, what Mic was trying to explain, and what Mark is also getting at, is that you can use fade cues to fade all sorts of aspects of cues. One of those is the rate.

To do that, simply make your one audio cue, and then set it as the target for a fade cue. Then, go into the Audio Effects tab of the fade cue, and check the “Fade rate to” box, and enter the rate you want to fade it to. Don’t make any other changes to the fade cue.

Et voila, you now have a fade cue that fades the rate of playback for the original piece of audio.

You can learn more about the capabilities of the Fade cue on these two pages of our help site:
https://figure53.com/docs/qlab/v3/audio/fading-audio/
https://figure53.com/docs/qlab/v3/video/fading-video/

And, as a reminder, you can always get to the QLab help section quickly and easily by simply going to http://qlab.tips

Shout back anytime we can help, and have an awesome Wednesday!

-Andy

—
Andy Lang
@SoundGuyAndy
sup...@figure53.com

​

[micpool]

Here is a workspace that demonstrates how this can be done by fading the playback rate on a single audio cue.

If you don't have a Pro license you can run it in demo mode (QLab Menu/Start Demo Mode....) for 20 mins

Mic

On Wednesday, August 17, 2016 at 6:19:06 AM UTC+1, Mark Valenzuela wrote:

I'm confused about why you need the second and third audio cue. If you're just trying to adjust speed, all you need is a single audio track, and fade cues that target the audio track that has a rate change. If you're trying to change the speed twice, it should be 3 cues - original audio cue, and 2 fade cues that change the speed. Am I missing something?

Mark 

On Aug 16, 2016, at 8:31 PM, John Peeples <john.pe...@gmail.com> wrote:

So, Yes, solved. With fade cues.

What I ended up doing was this:

1) I started one audio cue then auto-continue thru two more (the same piece of audio). The 2nd two cues start silent. 

2) When I'm ready to speed up the audio I have a fade cue that silences and stops the 1st audio cue, auto-continues, fades up the 2nd audio cue, and fades it's rate up slightly. I also have a fade cue to bring up the rate of the 3rd audio cue to the same speed as the 2nd but it continues to keep it silent so two stay in sync.

3) Now when I'm ready to speed things up again I have a cue that silences and stops the 2nd audio cue, auto-continues, fades up the 3rd audio cue, and fades up the rate a bit more of the 3rd audio cue. 

4) To stop there is another audio cue, an auto-continue, and a quick fade and stop of the 3rd audio cue.

It all works pretty well.

On Monday, August 15, 2016 at 11:28:33 AM UTC-5, Billie wrote:

I had same problem (ie Poe's Tell Tale Heart needed the small thing). I solved the same way but not real satisfying. Curious what solutions folks come up with.

On Sunday, August 14, 2016 at 1:14:26 PM UTC-7, John Peeples wrote:

Here's the situation:

I have a show with an audio track which needs to be sped up twice at various times. The various times depend on the actors timing and will change with each performance so the timing cannot be set in qLab.

The solution I came up with won't work the way I want it to. 

I created a group that starts three audio files at exactly the same time on the 1st 'Go'. One at normal speed, the second slightly faster, the third even faster. The two faster files are silent at first. When the operator wants to speed up she 'Go(s)' with the 1st speed up. qLab silences the 1st file and brings up the 2nd. When she wants to go to the 3rd speed she 'Go(s)' with the 2nd speed up. qLab silences the 2nd speed and brings up the 3rd. (hope this is making sense). It DOES work but because the 2nd two files are already playing faster they don't sync up when they begin to play. 

I cannot think of a way, because these are going to happen at various times for various performances, to get these things to sync up. 

I don't know of a way to get qLab to speed up audio files on the fly.

Any ideas would be helpful. 

[John Peeples]

This is great.

Really appreciate the demo.

I did change my show to use the workflow and it works even better.

So glad for the new info.

Always glad to learn a new way of working within qLab.

 

Once again, thanks for the new info everybody.

 

John

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