Hello, I've effectively an equalization thanks to your modifications on the plugin. The equalization is well working on a mono file. But I've some problems with stereo files. In stereo, I always have to define a frequency at 4kHz so as to have a cutting-frequency at 8kHz. Moreover, I observe a difference between left channel and right channel. If I define the frequency at 4khz and a bandwidth of 2kHz, left channel has a cutting frequency at 7kHz and right channel has a cutting frequency at 9kHz. We also have a difference of 3dB after the equalized band. You can see in attachment the observed results, obtained with the following command line: gst-launch filesrc=test.mp3 ! ffdemux_mp3 ! mfw_mp3decoder ! equalizer-nbands num-bands=1 band0::gain=-10 band0::freq=4000 band0::bandwidth=2000 ! alsasink First graph is obtained width a mono file, and second graph is obtained with a stereo file. Do you have some explanation? Why the defined frequency is not the same that the observed cutting frequency, and why have I a difference between right channel and left channel? Thanks for your help, Sabine <div class="gmail_quote">2009/2/3 Stefan Kost <<a href="mailto:ensonic@hora-obscura.de">ensonic@hora-obscura.de</a>> <blockquote class="gmail_quote" style="border-left: 1px solid rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;"> sabine donzé schrieb: <div><div></div><div class="Wj3C7c">> Hello, > > I'm using the equalizer-nbands plugin from gst-plugins-good_0.10.7. > However, if I configure the frequency for one or for each band, the > observed cutoff frequency is not the same than the defined frequency. > > For example: > > gst-launch filesrc location=toto.mp3 ! ffdemux_mp3 ! mfw_mp3decoder ! > equalizer-nbands num-bands=4 band0::gain=-21 band0::frequency=947 > band0::bandwidth=100 ! alsasink > > I should have a cutting frequency at 957Hz for band0. > In logfile, I observe that gain, frequency and bandwidth have been > correctly changed. But in setup_filter function, frequency is not at > defined value: > > 0:00:00.516575000  1477 0x14018 DEBUG            equalizer > gstiirequalizer.c:494:gst_iir_equalizer_compute_frequencies: band[ 0] > = '66.234133' > 0:00:00.517031000  1477 0x14018 DEBUG            equalizer > gstiirequalizer.c:494:gst_iir_equalizer_compute_frequencies: band[ 1] > = '372.461899' > 0:00:00.517357000  1477 0x14018 DEBUG            equalizer > gstiirequalizer.c:494:gst_iir_equalizer_compute_frequencies: band[ 2] > = '2094.507176' > 0:00:00.517678000  1477 0x14018 DEBUG            equalizer > gstiirequalizer.c:494:gst_iir_equalizer_compute_frequencies: band[ 3] > = '11778.279410' > 0:00:00.518174000  1477 0x14018 LOG              equalizer > gstiirequalizer.c:290:gst_iir_equalizer_child_proxy_get_children_count: > we have 4 children > 0:00:00.518600000  1477 0x14018 LOG              equalizer > gstiirequalizer.c:281:gst_iir_equalizer_child_proxy_get_child_by_index: > return child[0] 'band0' > 0:00:00.519124000  1477 0x14018 DEBUG            equalizer > gstiirequalizer.c:136:gst_iir_equalizer_band_set_property:<band0> gain > = 0.000000 -> -21.000000 > > 0:00:00.519571000  1477 0x14018 DEBUG            equalizer > gstiirequalizer.c:146:gst_iir_equalizer_band_set_property:<band0> > changed gain = -21.000000 > 0:00:00.520126000  1477 0x14018 LOG              equalizer > gstiirequalizer.c:290:gst_iir_equalizer_child_proxy_get_children_count: > we have 4 children > 0:00:00.520444000  1477 0x14018 LOG              equalizer > gstiirequalizer.c:281:gst_iir_equalizer_child_proxy_get_child_by_index: > return child[0] 'band0' > 0:00:00.520852000  1477 0x14018 DEBUG            equalizer > gstiirequalizer.c:154:gst_iir_equalizer_band_set_property:<band0> freq > = 66.234133 -> 947.000000 > 0:00:00.521334000  1477 0x14018 DEBUG            equalizer > gstiirequalizer.c:164:gst_iir_equalizer_band_set_property:<band0> > changed freq = 947.000000 > 0:00:00.521767000  1477 0x14018 LOG              equalizer > gstiirequalizer.c:290:gst_iir_equalizer_child_proxy_get_children_count: > we have 4 children > 0:00:00.522071000  1477 0x14018 LOG              equalizer > gstiirequalizer.c:281:gst_iir_equalizer_child_proxy_get_child_by_index: > return child[0] 'band0' > 0:00:00.522568000  1477 0x14018 DEBUG            equalizer > gstiirequalizer.c:172:gst_iir_equalizer_band_set_property:<band0> > width = 92.468265 -> 100.000000 > 0:00:00.523032000  1477 0x14018 DEBUG            equalizer > gstiirequalizer.c:182:gst_iir_equalizer_band_set_property:<band0> > changed width = 100.000000 > Setting pipeline to PAUSED ... > Pipeline is PREROLLING ... > 0:00:00.996510000  1477 0x2e7d0 DEBUG            equalizer > gstiirequalizer.c:451:gst_iir_equalizer_compute_frequencies: bands 4 -> 4 > 0:00:00.997166000  1477 0x2e7d0 DEBUG            equalizer > gstiirequalizer.c:494:gst_iir_equalizer_compute_frequencies: band[ 0] > = '66.234133' > 0:00:00.997577000  1477 0x2e7d0 DEBUG            equalizer > gstiirequalizer.c:494:gst_iir_equalizer_compute_frequencies: band[ 1] > = '372.461899' > 0:00:00.997921000  1477 0x2e7d0 DEBUG            equalizer > gstiirequalizer.c:494:gst_iir_equalizer_compute_frequencies: band[ 2] > = '2094.507176' > 0:00:00.998256000  1477 0x2e7d0 DEBUG            equalizer > gstiirequalizer.c:494:gst_iir_equalizer_compute_frequencies: band[ 3] > = '11778.279410' > 0:00:00.998887000  1477 0x2e7d0 INFO             equalizer > gstiirequalizer.c:438:setup_filter: gain =     -21, , bandwidth= > 92.468, frequency =  66.234, a0 = 0.98034, > 0:00:00.999431000  1477 0x2e7d0 INFO             equalizer > gstiirequalizer.c:438:setup_filter: gain =       0, , bandwidth= > 519.99, frequency =  372.46, a0 =       1, a1 > 0:00:01.000021000  1477 0x2e7d0 INFO             equalizer > gstiirequalizer.c:438:setup_filter: gain =       0, , bandwidth= > 2924.1, frequency =  2094.5, a0 =       1, a1 > 0:00:01.000526000  1477 0x2e7d0 INFO             equalizer > gstiirequalizer.c:438:setup_filter: gain =       0, , bandwidth= > 16443, frequency =   11778, a0 =       1, a1 > > </div></div>I filed a bug at <a href="http://bugzilla.gnome.org/show_bug.cgi?id=570343" target="_blank">http://bugzilla.gnome.org/show_bug.cgi?id=570343</a> Will look at it over the next days. Stefan <div class="Ih2E3d"> > Moreover, cutoff frequency observed at the end of audio chain is > around 200Hz > > I've also tried to define all bands, but cutting frequencies observed > are not coherent with defined frequencies. > > Moreover, according to configurations, we can have a difference of 6dB > between right way and left way. > > How does this plugin work? How configure it so as to have a cutting > frequency at 947Hz? > How to have the same output for right way and left way, or how to > configure the difference between right way and left way? > > Thanks for your help > Sabine </div>> ------------------------------------------------------------------------ > > ------------------------------------------------------------------------------ > This SF.net email is sponsored by: > SourcForge Community > SourceForge wants to tell your story. > <a href="http://p.sf.net/sfu/sf-spreadtheword" target="_blank">http://p.sf.net/sfu/sf-spreadtheword</a> > ------------------------------------------------------------------------ > > _______________________________________________ > gstreamer-devel mailing list > <a href="mailto:gstreamer-devel@lists.sourceforge.net">gstreamer-devel@lists.sourceforge.net</a> > <a href="https://lists.sourceforge.net/lists/listinfo/gstreamer-devel" target="_blank">https://lists.sourceforge.net/lists/listinfo/gstreamer-devel</a> > ------------------------------------------------------------------------------ Create and Deploy Rich Internet Apps outside the browser with Adobe(R)AIR(TM) software. 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