Spectrum seems different when porting from 0.10 to 1.0

[Sebastian Dröge]

On Di, 2014-11-04 at 01:29 +0100, Victor henri wrote:
> Hello
> 
> My app displays harmonics of the sound in 3D, thanks to the 'spectrum' element.
> When I use the microphone of the computer as the audio source, with Gstreamer-0.10, I have a clear view of the harmonics.
> When I do the same with Gstreamer-1.0, the sensitivity seems much higher, and I have a huge "background" noise contamining the spectrum data, especially in the lower frequencies (but also in the rest of the spectrogram), wich makes the ratio sound/background noise much lower. I can lower the sensitivity of the microphone but in that case, I loose the interesting display...
> 
> When I do an analysis of an audio file (either a flac, wac, mp3... or a file recorded by the app), it works fine.
> 
> I join two pictures to show the difference, when pronouncing differents voyels; you must see higher and lower harmonics, according to wich voyel is said; on the first pic, when gst-0.10 is used, you can see a very clear drawing; on the second pic, when gst-1.0 is used, although the sensitivity of the mic is lessened, the ratio sound/background noise is much worse.
> 
> I guess the spectrum element has been rewritten. What is possible to change? Is it possible to get more information on how this plugins works?

This looks like a regression in spectrum. It wasn't really rewritten,
but it was refactored a bit and IIRC the API changed slightly too.

Take a look at the example in gst-plugins-good/tests/examples/spectrum
to see if you're still using it correctly. If you do, please open a bug
report at http://bugzilla.gnome.org with a testcase to reproduce the
different behaviours. Thanks!

-- 
Sebastian Dröge, Centricular Ltd · http://www.centricular.com
-------------- next part --------------
A non-text attachment was scrubbed...
Name: signature.asc
Type: application/pgp-signature
Size: 949 bytes
Desc: This is a digitally signed message part
URL: <http://lists.freedesktop.org/archives/gstreamer-devel/attachments/20141104/0607ab7e/attachment.sig>