Waveform render ?

[Glenn Pierce]

Hi I would like some advice.

I would like to use Gstreamer and Python to render a waveform of audio data.
This is not in realtime. I was thinking of maybe creating a
waveform-image sink to do this ?

Are there any other elements that can do this or is there and easier way ?

I was hoping to keep things simple by getting all the audio data after
passing through the audioconvert element and the using matplotlib to
plot it.

Any ideas ?

Thanks

Glenn
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[Peteris Krisjanis-2]

2012. gada 6. janvāris 19:37 Glenn Pierce <[hidden email]> rakstīja:

> Hi I would like some advice.
>
> I would like to use Gstreamer and Python to render a waveform of audio data.
> This is not in realtime. I was thinking of maybe creating a
> waveform-image sink to do this ?
>
> Are there any other elements that can do this or is there and easier way ?
>
> I was hoping to keep things simple by getting all the audio data after
> passing through the audioconvert element and the using matplotlib to
> plot it.
>
> Any ideas ?

Glenn,

I would suggest to take a look how it's done in Pitivi or Jokosher.

Cheers,
Peter.
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[Olivier Aubert-2]

If you want to render data with matplotlib or any external app, you can
simply generate the data samples with a command line (RMS for the left
channel here, with a 10ms sample width):

gst-launch  -m uridecodebin name=decoder uri=file:///tmp/video.avi ! \
audioconvert ! level name=level interval=10000 ! fakesink | \
perl -lne 'print $1 if /rms.+?{\s+(-?\d+\.?\d*)/'

Olivier

On Fri, 2012-01-06 at 21:47 +0200, [hidden email] wrote:

> 2012. gada 6. janvāris 19:37 Glenn Pierce <[hidden email]> rakstīja:
> > Hi I would like some advice.
> >
> > I would like to use Gstreamer and Python to render a waveform of audio data.
> > This is not in realtime. I was thinking of maybe creating a
> > waveform-image sink to do this ?
> >
> > Are there any other elements that can do this or is there and easier way ?
> >
> > I was hoping to keep things simple by getting all the audio data after
> > passing through the audioconvert element and the using matplotlib to
> > plot it.
> >
> > Any ideas ?
>
> Glenn,
>
> I would suggest to take a look how it's done in Pitivi or Jokosher.
>
> Cheers,
> Peter.
> _______________________________________________
> gstreamer-devel mailing list
> [hidden email]
> http://lists.freedesktop.org/mailman/listinfo/gstreamer-devel

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[Glenn Pierce]

Thanks .

Pitivi's method looked good.


On 6 January 2012 19:47, [hidden email] <[hidden email]> wrote:

> 2012. gada 6. janvāris 19:37 Glenn Pierce <[hidden email]> rakstīja:
>> Hi I would like some advice.
>>
>> I would like to use Gstreamer and Python to render a waveform of audio data.
>> This is not in realtime. I was thinking of maybe creating a
>> waveform-image sink to do this ?
>>
>> Are there any other elements that can do this or is there and easier way ?
>>
>> I was hoping to keep things simple by getting all the audio data after
>> passing through the audioconvert element and the using matplotlib to
>> plot it.
>>
>> Any ideas ?
>
> Glenn,
>
> I would suggest to take a look how it's done in Pitivi or Jokosher.
>
> Cheers,
> Peter.
> _______________________________________________
> gstreamer-devel mailing list
> [hidden email]
> http://lists.freedesktop.org/mailman/listinfo/gstreamer-devel

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[Stefan Sauer]

On 01/06/2012 06:37 PM, Glenn Pierce wrote:
> Hi I would like some advice.
>
> I would like to use Gstreamer and Python to render a waveform of audio data.
> This is not in realtime. I was thinking of maybe creating a
> waveform-image sink to do this ?
In buzztard I decode the audio snippets to a wavetable array (using
fdsink and mmap) and plot it from there using cairo.

Stefan

> Are there any other elements that can do this or is there and easier way ?
>
> I was hoping to keep things simple by getting all the audio data after
> passing through the audioconvert element and the using matplotlib to
> plot it.
>
> Any ideas ?
>
> Thanks
>
> Glenn
> _______________________________________________
> gstreamer-devel mailing list
> [hidden email]
> http://lists.freedesktop.org/mailman/listinfo/gstreamer-devel

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