Difference between revisions of "Music Player Daemon/Tips and tricks"

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As with any PulseAudio-enabled program, mpd can send sound over the network.  The complete PulseAudio system is not required on the server running mpd; {{Pkg|libpulse}} is the only requirement to act as a source and is already a dependency of mpd.
 
As with any PulseAudio-enabled program, mpd can send sound over the network.  The complete PulseAudio system is not required on the server running mpd; {{Pkg|libpulse}} is the only requirement to act as a source and is already a dependency of mpd.
  
In order to send audio from mpd to another computer follow the directions above, editing {{ic|/etc/mpd.conf}} on the server running mpd using the IP address of the target computer and {{ic|/etc/pulse/default.pa}} or {{ic|~/.pulse/default.pa}} on the target computer using the IP address of the server.
+
In order to send audio from mpd to another computer follow the directions above, editing {{ic|/etc/mpd.conf}} on the server running mpd using the IP address of the target computer and {{ic|/etc/pulse/default.pa}} or {{ic|$XDG_CONFIG_HOME/default.pa}} (typically {{ic|~/.config/pulse/default.pa}}) on the target computer using the IP address of the server.
  
 
Once this is done, the server's mpd source should show up on the target computer while playing or paused as a normal source able to be rerouted and controlled as usual; there will be no visible source on the target while mpd is stopped.
 
Once this is done, the server's mpd source should show up on the target computer while playing or paused as a normal source able to be rerouted and controlled as usual; there will be no visible source on the target while mpd is stopped.

Revision as of 06:28, 21 December 2012

Go back to Music Player Daemon.

Tips and Tricks

Organizing

MPD doesn't provide a tool to preserve the file structure of your audio files. Check out beets.

Last.fm scrobbling

To scrobble your songs to Last.fm when using MPD, there are several possibilities.

mpdscribble

mpdscribble is a daemon, available in the "community" repository (if you prefer, the "git" version is available in the AUR). This is arguably the best alternative, because it's the semi-official MPD scrobbler and uses the new "idle" feature in MPD for more accurate scrobbling. Also, you do not need root access to configure it, because it doesn't need any changes to /etc at all. Visit the official website for more information.

After you have installed mpdscribble, do the following (not as root):

$ mkdir ~/.mpdscribble
  • Create the file ~/.mpdscribble/mpdscribble.conf and add the following:
~/.mpdscribble/mpdscribble.conf
[mpdscribble] 
 host = <your mpd host> # optional, defaults to $MPD_HOST or localhost
 port = <your mpd port> # optional, defaults to $MPD_PORT or 6600
 log = /home/<YOUR_USERNAME>/.mpdscribble/mpdscribble.log
 verbose = 2
 sleep = 1
 musicdir = <your music directory>
 proxy = <your proxy> # optional, e. g. http://your.proxy:8080, defaults to none

 [last.fm]
 # last.fm section, comment if you do not use last.fm
 url = http://post.audioscrobbler.com/
 username = <your last.fm username>
 password = <your last.fm password> 
 journal = /home/<YOUR_USERNAME>/.mpdscribble/lastfm.journal

 [libre.fm]
 # libre.fm section, comment if you do not use libre.fm
 url = http://turtle.libre.fm/
 username = <your libre.fm username>
 password = <your libre.fm password>
 journal = /home/<YOUR_USERNAME>/.mpdscribble/librefm.journal

Please note that passwords can also be written down as MD5:

echo -n 'PASSWORD' | md5sum | cut -f 1 -d " "
  • Add mpdscribble to the file in which you start mpd as well (e.g. ~/.xinitrc):
pidof mpdscribble >& /dev/null
if [ $? -ne 0 ]; then
 mpdscribble &
fi

mpdscribble per user with systemd

Since systemd is default on new installations, starting mpdscribble with .xinitrc is outdated. mpdscribble should be started per user with systemd. See Mpd#Start_MPD_per_user_with_systemd and Systemd/User.

Install mpdscribble

pacman -S mpdscribble

Create a directory for mpdscribble and copy the example .conf

mkdir ~/.mpdscribble
cp /usr/share/mpdscribble/mpdscribble.conf.example ~/.mpdscribble.conf

With the current version mpdscribble 0.22-5, adding the sections mentiond above to ~/.mpdscribble.conf isn't necessary. Just add your username and password.

Then, edit a new file ~/.config/systemd/user/mpdscribble.service

~/.config/systemd/user/mpdscribble.service
[Unit]
Description = MPD Scribbler

[Service]
ExecStart = /usr/bin/mpdscribble -D
Restart = always

[Install]
WantedBy = default.target

Now, enable and start mpdscribble.service as per user

$ systemctl --user enable mpdscribble
$ systemctl --user start mpdscribble

Sonata & Ario

Sonata has built-in support for scrobbling, although that requires the program to run the whole time. Additionally, Sonata doesn't cache the songs if they cannot be forwarded to Last.fm at the time of playing, meaning they will not be added to the statistics.

lastfmsubmitd

The daemon lastfmsubmitd is a daemon which may be installed from the "community" repository as well. To install it, first edit /etc/lastfmsubmitd.conf to reflect your requirements and add both lastfmsubmitd and lastmp to the DAEMONS array in /etc/rc.conf.

Last.fm playback

Native Last.fm playback

Since version 0.16 mpd has a very well working method to play back last.fm streams.

/etc/mpd.conf
$ playlist_plugin {
       name            "lastfm"
       user            "my_username"
       password        "my_password"
}

Then use e.g. mpc to load streams

$ mpc load "lastfm://artist/Beatles"

Never play on start

This feature is present in mpd after version 0.16.2. When this feature is enabled, the mpd process will always start in the "paused" state, even if a song was playing when mpd was stopped. Add the line below to your mpd.conf file to enable this feature.

restore_paused "yes"

The following sections detail various methods to simulate the same feature for older versions of mpd.

Installing mpd from the AUR

This is the best method currently available, but is only currently (as of April 2011) enabled in the git version. Install mpd-git from the AUR and add restore_paused "yes" to your mpd.conf file.

If you have issues with connecting your client to mpd-git, see Music Player Daemon/Troubleshooting#Other issues when attempting to connect to mpd with a client.

Method 1

If you do not want MPD to always play on your system start, but yet you want to preserve the other state information, add the following lines to your /etc/rc.d/mpd file:

Method 1.1

Simpler, working method (disables playing on startup of mpd daemon):

 start)

...

     mpc -q pause #add this line only
     add_daemon mpd
     stat_done

To prevent updates from destroying these modifications, add this file to the NoUpgrade variable in /etc/pacman.conf:

NoUpgrade = etc/rc.d/mpd

Method 2

Another simpler method, would be to add mpd to your rc.conf daemons array and add mpc stop or mpc pause to /etc/rc.local.shutdown and to /etc/rc.local. (Remember you must have mpc installed to use this method).

Adding only the order in /etc/rc.local cannot assure that mpd will play absolutely nothing, since there may be a delay before the stop command is executed. On the other hand, if you only add the order to /etc/rc.local.shutdown, that will assure that mpd won't play at all, as long as you properly shutdown your system. Even though they are redundant, adding it to /etc/rc.local would serve as a safety for those, presumably, rare occasions when you do not shutdown the system properly.

Method 3

The general idea is to ask mpd to pause music when the user logs out, so that mpd will stick to the "pause" state after a reboot. Sending such command can be achieved using mpc, the command line interface to MPD.

GDM users can then add /usr/bin/mpc pause to /etc/gdm/PostSession/Default (be sure to add it before exit 0):

Non-GDM users can use their own login manager's method to launch the line at logout.

Example configuration: Output with 44.1 KHz at e. g. 16 bit depth, multiple programs at once

Why these formats? Because they are standard CDA, because ALSA on its own allows more than one program "to sound" only with dmix — whose resampling algorithm is inferior — and because dmix by default resamples anything lower to 48 KHz (or whatever higher format is playing at the time). Also, some get clicking sounds if at least mpd.conf is not changed this way.

What's the downside? These settings cause everything (if necessary) to be resampled to this format, such as material from DVD or TV which usually is at 48 KHz. But there is no known way to have ALSA dynamically change the format, and particularly if you listen to far more CDs than anything else the occasional 48 → 44.1 isn't too great a loss.

The following assumes that there are not already other settings which conflict resp. overwrite it. This applies especially to the current user's potential ~/.asoundrc — which MPD as its own user ignores, therefore the following should go to /etc/asound.conf:

/etc/asound.conf
defaults.pcm.dmix.rate 44100 # Force 44.1 KHz
defaults.pcm.dmix.format S16_LE # Force 16 bits
/etc/mpd.conf
audio_output {
        type                    "alsa" # Use the ALSA output plugin.
	name			"HDA Intel" # Can be called anything or nothing tmk, but must be present.
        options                 "dev=dmixer"
        device                  "plug:dmix" # Both lines cause MPD to output to dmix.
	format	        	"44100:16:2" # the actual format
	auto_resample		"no" # This bypasses ALSA's own algorithms, which generally are inferior. See below how to choose a different one.
	use_mmap		"yes" # Minor speed improvement, should work with all modern cards.
}

samplerate_converter		"0" # MPD's best, most CPU intensive algorithm. See 'man mpd.conf' for others — for anything other than the poorest "internal", libsamplerate must be installed.
Note: MPD gives the mp3 format a special treatment at decoding: It's always put out as 24 bit. (The conversion as forced by the format line only comes after that.)

If one wants to leave the bit depth decision to ALSA resp. MPD, comment out resp. omit the dmix.format line and change the one for mpd with format to "44100:*:2".

Note: Crossfading between files decoded at two different bit depths (say, one mp3 and one 16 bit flac) does not work unless conversion is active.

Control MPD with lirc

There are already some clients designed for communications between lircd and MPD, however, as far as the practical use, they aren't very useful since their functions are limited.

It's recommended to use mpc with irexec. mpc is a command line player which only sends the command to MPD and exits immediately, which is perfect for irexec, the command runner included in lirc. What irexec does is that it runs a specified command once received a remote control button.

First of all, please setup your remotes as referred to the Lirc article.

Edit your favored lirc startup configuration file, default location is ~/.lircrc.

Fill the file with the following pattern:

begin
     prog = irexec
     button = <button_name>
     config = <command_to_run>
     repeat = <0 or 1>
end

An useful example:

## irexec
begin
     prog = irexec
     button = play_pause
     config = mpc toggle
     repeat = 0
end

begin
     prog = irexec
     button = stop
     config = mpc stop
     repeat = 0
end
begin
     prog = irexec
     button = previous
     config = mpc prev
     repeat = 0
end
begin
     prog = irexec
     button = next
     config = mpc next
     repeat = 0
end
begin
     prog = irexec
     button = volup
     config = mpc volume +2
     repeat = 1
end
begin
     prog = irexec
     button = voldown
     config = mpc volume -2
     repeat = 1
end
begin
     prog = irexec
     button = pbc
     config = mpc random
     repeat = 0
end
begin
     prog = irexec
     button = pdvd
     config = mpc update
     repeat = 0
end
begin
     prog = irexec
     button = right
     config = mpc seek +00:00:05
     repeat = 0
end
begin
     prog = irexec
     button = left
     config = mpc seek -00:00:05
     repeat = 0
end
begin
     prog = irexec
     button = up
     config = mpc seek +1%
     repeat = 0
end
begin
     prog = irexec
     button = down
     config = mpc seek -1%
     repeat = 0
end

There are more functions for mpc, run man mpc for more info.

Control MPD with phone

remuco via bluetooth
  • install remuco -- a wireless remote control for several Linux media players (aur)
  • transfer remuco client -- jar/jad files from /usr/share/remuco/client/ to your phone and install it
  • run remuco-mpd (as current user)
  • run remuco on your phone, define a new bluetooth remuco connection (pair first if you haven't done this previously) and explore its capabilities
others

There are several MPD-specific clients available in the app-store/market of Symbian, Android and iOS.

MPD & PulseAudio

mpd supports both local and remote use of PulseAudio.

Local (as your own user)

No special options are required; just add a pulse output as described in the comments of mpd's config file.

Local (with separate mpd user)

When run as its own user as per the wiki instructions, mpd will be unable to send sound to another user's pulseaudio server. Rather than setting up pulseaudio as a system-wide daemon, a practice strongly discouraged by upstream, you can instead configure mpd to use pulseaudio's tcp module to send sound to localhost:

First, uncomment the tcp module in /etc/pulse/default.pa or $XDG_CONFIG_HOME/default.pa (typically ~/.config/pulse/default.pa) and set 127.0.0.1 as an allowed IP address; the home directory takes precedence:

### Network access (may be configured with paprefs, so leave this commented
### here if you plan to use paprefs)
#load-module module-esound-protocol-tcp
load-module module-native-protocol-tcp auth-ip-acl=127.0.0.1
#load-module module-zeroconf-publish

Additional IP ranges in cidr notation may be added using ; as the separator. Once this is complete, restart pulseaudio:

$ pulseaudio --kill
$ pulseaudio --start -or- start-pulseaudio-x11/kde

Next, edit /etc/mpd.conf and add a new pulse output pointing to 127.0.0.1 as a "remote" server:

audio_output {
       type		"pulse"
       name		"Local Music Player Daemon"
       server		"127.0.0.1"
}

Once this is added, restart mpd:

# systemctl restart mpd

Enable the output in mpd; you should now have a working local mpd, usable by all users whose pulseaudio servers allow sound from 127.0.0.1.

Remote

As with any PulseAudio-enabled program, mpd can send sound over the network. The complete PulseAudio system is not required on the server running mpd; libpulse is the only requirement to act as a source and is already a dependency of mpd.

In order to send audio from mpd to another computer follow the directions above, editing /etc/mpd.conf on the server running mpd using the IP address of the target computer and /etc/pulse/default.pa or $XDG_CONFIG_HOME/default.pa (typically ~/.config/pulse/default.pa) on the target computer using the IP address of the server.

Once this is done, the server's mpd source should show up on the target computer while playing or paused as a normal source able to be rerouted and controlled as usual; there will be no visible source on the target while mpd is stopped.

Cue Files

To make cue file support actually work, you have to work around a nasty libcue bug. Libcue copied some files directly from libcdio, making it conflict with it. Steps to do to get proper cue support:

  • remove libcdio temporary (pacman -Rdd libcdio)
  • install libcue
  • install mpd with ABS or from AUR.
  • install libcdio again

Version 0.17 will fix this issue, implementing its very own cue parser, which will then also allow parsing cuesheets, that are embedded into the files tags (CUESHEET tag). This will work for most, if not all relevant music files.

HTTP Streaming

Since version 0.15 there is a built-in HTTP streaming daemon/server that comes with MPD. To activate this server simply set it as output device in mpd.conf:

audio_output {    
	type		"httpd"    
	name		"My HTTP Stream"    
	encoder		"vorbis"		# optional, vorbis or lame    
	port		"8000"    
#	quality		"5.0"			# do not define if bitrate is defined    
	bitrate		"128"			# do not define if quality is defined    
	format		"44100:16:1"    
}

Then to listen to this stream simply open the URL of your mpd server (along with the specified port) in your favorite music player. Note: You may have to specify the file format of the stream using an appropriate file extension in the URL. For example, using Winamp 5.5, You would use http://192.168.1.2:8000/mpd.ogg rather than http://192.168.1.2:8000/.

To use mpd to connect to the stream from another computer.

mpc add http://192.168.1.2:8000