Waveform render ?

[Olivier Aubert]

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, pecisk at gmail.com wrote:
> 2012. gada 6. janvāris 19:37 Glenn Pierce <glennpierce at gmail.com> 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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