[Pkg-mpd-maintainers] Bug#972412: mpd: Stutters on startup when both alsa and http outputs are enabled

[Ian]

Package: mpd
Version: 0.21.26-1~bpo10+1
Severity: normal

Dear Maintainer,

I enabled the http output plugin to be able to share my music with others on my network.
Mostly it works beautifully, but from the time I did that, _once only_ when playback starts,
there is a brief interruption and silence, and the log shows the infamous message

  Decoder is too slow; playing silence to avoid xrun

It never happens again after mpd starts playing.

I thought at first that this was a regression of upstream Issue #420,
perhaps related to the backporting to Debian stable, but now I think
it is a different problem, even if a similar one.

This is not a powerful machine but the load is almost zero. And I have
tested starting mpd later away from the initial thundering herd, it
still happens.

I would have liked to try if enabling realtime scheduling makes
a difference, though I am not too hopeful given how load doesn't
seem to matter. Alas, I'm in love with sysvinit :-P and I don't know
how to make realtime available to mpd in that context, ie. the
classic double-forking daemon.

-- System Information:
Debian Release: 10.6
  APT prefers stable
  APT policy: (990, 'stable'), (500, 'stable-updates'), (500, 'testing')
Architecture: amd64 (x86_64)

Kernel: Linux 4.19.0-11-amd64 (SMP w/4 CPU cores)
Locale: LANG=en_US.UTF-8, LC_CTYPE=en_US.UTF-8 (charmap=UTF-8), LANGUAGE=en_US.UTF-8 (charmap=UTF-8)
Shell: /bin/sh linked to /usr/bin/dash
Init: sysvinit (via /sbin/init)

Versions of packages mpd depends on:
ii  adduser                           3.118
ii  init-system-helpers               1.56+nmu1
ii  libadplug-2.2.1-0v5               2.2.1+dfsg3-1
ii  libao4                            1.2.2+20180113-1
ii  libasound2                        1.1.8-1
ii  libaudiofile1                     0.3.6-5
ii  libavahi-client3                  0.7-4+b1
ii  libavahi-common3                  0.7-4+b1
ii  libavcodec58                      7:4.1.6-1~deb10u1
ii  libavformat58                     7:4.1.6-1~deb10u1
ii  libavutil56                       7:4.1.6-1~deb10u1
ii  libbz2-1.0                        1.0.6-9.2~deb10u1
ii  libc6                             2.28-10
ii  libcdio-cdda2                     10.2+0.94+2-4
ii  libcdio-paranoia2                 10.2+0.94+2-4
ii  libcdio18                         2.0.0-2
ii  libcurl3-gnutls                   7.64.0-4+deb10u1
ii  libdbus-1-3                       1.12.20-0+deb10u1
ii  libexpat1                         2.2.6-2+deb10u1
ii  libfaad2                          2.8.8-3
ii  libflac8                          1.3.2-3
ii  libfluidsynth1                    1.1.11-1
ii  libgcc1                           1:8.3.0-6
ii  libgcrypt20                       1.8.4-5
ii  libgme0                           0.6.2-1
ii  libicu63                          63.1-6+deb10u1
ii  libid3tag0                        0.15.1b-14
ii  libiso9660-11                     2.0.0-2
ii  libixml10                         1:1.8.4-2
ii  libjack-jackd2-0 [libjack-0.125]  1.9.12~dfsg-2
ii  libjs-sphinxdoc                   1.8.4-1
ii  libmad0                           0.15.1b-10
ii  libmikmod3                        3.3.11.1-4
ii  libmms0                           0.6.4-3
ii  libmodplug1                       1:0.8.9.0-2
ii  libmp3lame0                       3.100-2+b1
ii  libmpcdec6                        2:0.1~r495-1+b2
ii  libmpdclient2                     2.16-1
ii  libmpg123-0                       1.25.10-2
ii  libnfs12                          3.0.0-2
ii  libogg0                           1.3.2-1+b1
ii  libopenal1                        1:1.19.1-1
ii  libopus0                          1.3-1
ii  libpcre3                          2:8.39-12
ii  libpulse0                         12.2-4+deb10u1
ii  libsamplerate0                    0.1.9-2
ii  libshout3                         2.4.1-2
ii  libsidplayfp4                     1.8.8-1
ii  libsmbclient                      2:4.9.5+dfsg-5+deb10u1
ii  libsndfile1                       1.0.28-6
ii  libsndio7.0                       1.5.0-3
ii  libsoxr0                          0.1.2-3
ii  libsqlite3-0                      3.27.2-3
ii  libstdc++6                        8.3.0-6
ii  libsystemd0                       241-7~deb10u4
ii  libupnp13                         1:1.8.4-2
ii  libvorbis0a                       1.3.6-2
ii  libvorbisenc2                     1.3.6-2
ii  libwavpack1                       5.1.0-6
ii  libwildmidi2                      0.4.3-1
ii  libyajl2                          2.1.0-3
ii  libzzip-0-13                      0.13.62-3.2
ii  lsb-base                          10.2019051400
ii  zlib1g                            1:1.2.11.dfsg-1

mpd recommends no packages.

Versions of packages mpd suggests:
pn  avahi-daemon          <none>
pn  icecast2              <none>
ii  mpc [mpd-client]      0.31-1
ii  ncmpcpp [mpd-client]  0.8.2-0.1
pn  pulseaudio            <none>

-- Configuration Files:
/etc/mpd.conf changed [not included]

-- no debconf information