Time stretching

[Dave Mateer]

Can someone point out to me what plug-in I need to do a time stretch? (Change the playback rate without changing pitch.)

 

Also, will this keep the clock synchronized across all media? That is, if the audio is playing back at 50% speed, then the associated video should also be played at half-speed.

 

Thanks,

 

Dave

 

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[Dave Mateer]

Anyone? Is there no such plugin?

 

<bump />

 

From: gstreamer-devel-bounces+dave_mateer=[hidden email] [mailto:gstreamer-devel-bounces+dave_mateer=[hidden email]] On Behalf Of Dave Mateer
Sent: Wednesday, May 02, 2012 3:16 PM
To: [hidden email]
Subject: Time stretching

 

Can someone point out to me what plug-in I need to do a time stretch? (Change the playback rate without changing pitch.)

 

Also, will this keep the clock synchronized across all media? That is, if the audio is playing back at 50% speed, then the associated video should also be played at half-speed.

 

Thanks,

 

Dave

 

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[Sean McNamara-4]

Hi,

On 5/11/12, Dave Mateer <[hidden email]> wrote:
> Anyone? Is there no such plugin?

The only plugin that I personally know of that does "time stretching"
is the GstSoundtouch plugin, the "pitch' element within that. But I
don't think it handles video at all.

If you're up for writing your own plugin, you might be able to sync up
the operations of GstSoundtouch with an element (does one exist?) for
video time shifting, by using your own reference clock within the
element to automatically drop frames/samples or whatever
underrun/overrun compensating mechanism you want to implement. At
least half of the work (the audio part) is done for you...

HTH,

Sean

>
> <bump />
>
> From: gstreamer-devel-bounces+dave_mateer=[hidden email]
> [mailto:gstreamer-devel-bounces+dave_mateer=[hidden email]]
> On Behalf Of Dave Mateer
> Sent: Wednesday, May 02, 2012 3:16 PM
> To: [hidden email]
> Subject: Time stretching
>
> Can someone point out to me what plug-in I need to do a time stretch?
> (Change the playback rate without changing pitch.)
>
> Also, will this keep the clock synchronized across all media? That is, if
> the audio is playing back at 50% speed, then the associated video should
> also be played at half-speed.
>
> Thanks,
>
> Dave
>
>

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[Olivier Aubert-2]

You can use the scaletempo module to preserve the pitch of the audio
track. The video will be synchronized, since you will specify the whole
pipeline playback rate with the first parameter of gst_event_new_seek.

In other words, it is not the audio component that imposes its rate to
the pipeline. Instead, the scaletempo element will adjust the pitch
according to the playback rate of the pipeline.

Olivier

On Fri, 2012-05-11 at 15:10 -0400, Dave Mateer wrote:

> Anyone? Is there no such plugin?
>
>  
>
> <bump />
>
>  
>
> From: gstreamer-devel-bounces
> +dave_mateer=[hidden email]
> [mailto:gstreamer-devel-bounces
> +dave_mateer=[hidden email]] On Behalf Of Dave Mateer
> Sent: Wednesday, May 02, 2012 3:16 PM
> To: [hidden email]
> Subject: Time stretching
>
>
>  
>
> Can someone point out to me what plug-in I need to do a time stretch?
> (Change the playback rate without changing pitch.)
>
>  
>
> Also, will this keep the clock synchronized across all media? That is,
> if the audio is playing back at 50% speed, then the associated video
> should also be played at half-speed.
>
>  
>
> Thanks,
>
>  
>
> Dave
>
>  
>
>
> _______________________________________________
> gstreamer-devel mailing list
> [hidden email]
> http://lists.freedesktop.org/mailman/listinfo/gstreamer-devel

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