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equalizer audio

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sabine donzé

equalizer audio

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

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

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Stefan Sauer

Re: equalizer audio

sabine donzé schrieb:

> 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
>
>

I filed a bug at
http://bugzilla.gnome.org/show_bug.cgi?id=570343
Will look at it over the next days.

Stefan

> 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
> ------------------------------------------------------------------------
>
> ------------------------------------------------------------------------------
> This SF.net email is sponsored by:
> SourcForge Community
> SourceForge wants to tell your story.
> http://p.sf.net/sfu/sf-spreadtheword
> ------------------------------------------------------------------------
>
> _______________________________________________
> gstreamer-devel mailing list
> [hidden email]
> https://lists.sourceforge.net/lists/listinfo/gstreamer-devel
>

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sabine donzé

Re: equalizer audio

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

2009/2/3 Stefan Kost <[hidden email]>

sabine donzé schrieb:

> 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
>
>

I filed a bug at
http://bugzilla.gnome.org/show_bug.cgi?id=570343
Will look at it over the next days.

Stefan

> 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

> ------------------------------------------------------------------------
>
> ------------------------------------------------------------------------------
> This SF.net email is sponsored by:
> SourcForge Community
> SourceForge wants to tell your story.
> http://p.sf.net/sfu/sf-spreadtheword
> ------------------------------------------------------------------------
>
> _______________________________________________
> gstreamer-devel mailing list
> [hidden email]
> https://lists.sourceforge.net/lists/listinfo/gstreamer-devel
>

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software. With Adobe AIR, Ajax developers can use existing skills and code to
build responsive, highly engaging applications that combine the power of local
resources and data with the reach of the web. Download the Adobe AIR SDK and
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Test equal 090106.pps (48K) Download Attachment

Stefan Sauer

Re: equalizer audio

sabine donzé schrieb:

> 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
>
> 2009/2/3 Stefan Kost <[hidden email]
> <mailto:[hidden email]>>
>
> sabine donzé schrieb:
> > 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
> >
> >
> I filed a bug at
> http://bugzilla.gnome.org/show_bug.cgi?id=570343
> Will look at it over the next days.
>
> Stefan
>
> > 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
>

Sorry for looon delay. I have had a quick look and filed
https://bugzilla.gnome.org/show_bug.cgi?id=597397 now. I'll have a look
at the code in the coming days. In the future it would be good if you
can just file the bugs instead.

Stefan

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Stefan Sauer

Re: equalizer audio

Stefan Kost schrieb:

> sabine donzé schrieb:
>> 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
>>
>> 2009/2/3 Stefan Kost <[hidden email]
>> <mailto:[hidden email]>>
>>
>> sabine donzé schrieb:
>> > 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
>> >
>> >
>> I filed a bug at
>> http://bugzilla.gnome.org/show_bug.cgi?id=570343
>> Will look at it over the next days.
>>
>> Stefan
>>
>> > 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
>>
>
> Sorry for looon delay. I have had a quick look and filed
> https://bugzilla.gnome.org/show_bug.cgi?id=597397 now. I'll have a look
> at the code in the coming days. In the future it would be good if you
> can just file the bugs instead.
>
> Stefan

and fixed :)

Stefan

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ahead of the curve. Join us from November 9-12, 2009. Register now!
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