There are new comer Linux users that still think that installing ffmpeg, mencoder and flvtool2 is hard to do in Linux. I can understand this because not many tutorial site tell them how to do it easily. If you do not need “ bleeding-edge” features of the latest ffmpeg, ffmpeg-php, mencoder, mplayer and flvtool2, you can use this tip I wrote. You need additional Debian repository to do this tip. Add debian-multimedia repository in your /etc/apt/sources.list (edit this file using your favorite text editor such as vim or nano).

Related Tags:,,,,,,,,, This entry was posted on January 22, 2012 at 11:38 pm and is filed under,,. You can follow any responses to this entry through the feed. You can, or from your own site. 15 Responses to “ALSA Equalizer & Crossfeed on Debian Stable (Squeeze)” • moa Says: very usefull. • Says: I’ve been trying for ages on my crunchbang (Debian based) and all I’ve got is every audio app crashing when audio is played? • takla Says: I have no experience of crunchbang. Perhaps it uses Pulse Audio by default?

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If so then my blog post on setting up ALSA crossfeed and equalizer is not suitable for you. Chaining alsa devices can be difficult.

Alsa is complex and some of the documentation lacks clarity or appears to be/is incomplete or ambiguous, or maybe has suffered in translation. Here is one way to simplify: instead of configuring both equalizer and crossfeed in ~/.asoundrc you can configure only an equalizer and then use audio and video apps which use their own crossfeed plug-in. For example MPlayer can use its own implementation i.e. Mplayer -af bs2b=profile=jmeier.

VLC also has its own headphone filter. Alternatively you could set up an Alsa crossfeed and use apps which implement their own equalizer. Again VLC comes to mind for video and audio, and DeadBeef or Audacious for audio. • Mau Says: hi there, hi followed your guide and when i chose anything other than “My Alsa Device” in mpc outputs i got the following error: ALSA lib pcm.c:2190:(snd_pcm_open_noupdate) Unknown PCM equal2 Feb 15 12:06: output: Failed to open “EQ+bs2b” [alsa]: Failed to open ALSA device “equal2”: No such file or directory i can’t figure out what’s wrong, can you help? • takla Says: Check your ~/.asoundrc is correctly written, as it seems you have no alsa equal2 device. You can also run ‘alsamixer -D ‘ to see if a device exists. If the device exists but mpd doesn’t see it then is mpd running as a different user?

I run mpd under my normal user name so it sees my ~/.asoundrc. I don’t know your system, alsa version, ~/.asoundrc or /etc/asound.conf so can’t say more than that. • Mau Says: i did copy your.asoundrc with pcm.!default for systemwide eq, I’m on debian squeeze, Alsa is ver 1.0.21.If I run “alsamixer -D equal” i get the eq controls i guess the problem must be mpd not being able to see alsa configuration file i’m going to check as soon as i’m able to.Thanks for now • takla Says: I think I should have been clearer about “systemwide”. In this context it meant all yout system’s audio apps that are run by you, the user. A standard Debian install of mpd creates a new mpd user and mpd is run under that user, not your regular user ID. Your regular user just runs a client such as gmpc or mpc or similar, but not the daemon. In my case I change the Debian default by editing ~/.mpdconf and specifying the user is me i.e: # General music daemon options ################################################ # # This setting specifies the user that MPD will run as.

MPD should never run as # root and you may use this setting to make MPD change its user ID after # initialization. This setting is disabled by default and MPD is run as the # current user. # user “takla” and I edit /etc/default/mpd and add: MPDCONF=/home/takla/.mpdconf Then when mpd starts it is under my user and it sees and uses my ~/.asoundrc. If you use mpd as a home player, i.e. Not accessible outside your trusted LAN, then there is no need for it to run as a special mpd user. Your own user account is fine. The Debian default is sensibly cautious but there is no harm in changing it according to circumstances.

• Mau Says: hi, while was waiting for your response i checked again my.asoundrc and i found few mystypes i did miss first time,everything works now. Thanks again for your help and time • takla Says: You’re welcome. I hope to still receive support from this post I am using debian squeeze (oldstable) and it seems that package bs2b-ladspa is not available any more. I installed the one available for sid.

I followed the “how-to” from above and I am not sure if it really worked. Anyway, the problem is that I am spotify premium user, and now, when I try to reproduce any track, the terminal shows the following message: 11:10:52.694 I [audio_driver_linux.cpp:26 ] Using Alsa ALSA lib dlmisc.c:236:(snd1_dlobj_cache_get) Cannot open shared library /usr/lib/alsa-lib/libasound_module_pcm_equal.so 11:10:52.750 E [audio_streamer_decompressor.cpp:296] playbackError(-6) 11:11:01.728 I [recommendations.js:17 ] Failed to get top playlists Is there any way to restore my system to the stauts previuos to the alsa eualizer installation? Thank you in advance! • takla Says: In current Debian releases (Wheezy and newer) with multi architecture support things have changed since I wrote the article: alsa-lib is not in /usr/lib but in /usr/lib/i386-linux-gnu or /usr/lib/x86_64-linux-gnu or similar, depending on architecture.

So you can’t anymore just drop in a package from Sid into Squeeze and expect it to work. Anyway just uninstall it: # apt-get purge bs2b-ladspa and # alsa force-reload (or reboot) You can then just delete or rename your ~/.asoundrc and sound should work as before. • Says: Hello Takla. Thank you very much for your advice.

It worked perfectly. Well yes, I was quite brave just installing a package which do not correspond to my release, but I wanted to try it, that’s how some newbies like me can learn. By the way, do you know if there is another possibility to install an equalizer for squeeze?

Thank you very much again for your attention! • takla Says: For Squeeze you could build the equaliser and bs2b from source. Unless there is some pressing reason not to change I would upgrade from Debian oldstable to stable. Bs2b-ladspa and libasound2-plugin-equal are both in normal Wheezy repos.

• Says: A Puppy Linux user wrote a gui for alsaequal called “pEqualizer”: • Says: So nice setup!, thanks a lot for sharing 🙂.