Package: mpd Version: 0.21.5-3 Severity: normal Dear Maintainer,
I'm pretty sure this is not a bug in MPD but probably in some of the libraries it uses (libresample, maybe?). Usually, when playing 44.1kHz flac files on my ARM SoC based on Allwinner A10 (with one ARM Cortex A8), the CPU use of MPD is negligeable (<10%), but when playing flac files sampled at 88.2kHz the CPU is pegged at 100% and the playback frequently skips because the CPU can't keep up. I tried this test on my BananaPi with the exact same setup (cloned Debian install) and the BananPi plays the file with no problem at all, with a CPU use still <10%. The BananaPi is a very similar machine built around the Allwinner A20 which is also a very similar SoC (but with two ARM Cortex A7). AFAIK the audio output hardware is similar, so I'd expect that if resampling is needed on one it's also needed on the other, but I'm not 100% sure and don't know how to confirm it. The other important difference is the CPU, where the A7 is a bit more recent and lists support for the following additional features: evtstrm idiva idivt lpae vfpv4 So I'm wondering if the problem might be that some library is using one of those features and is then massively slowed down by some in-kernel emulation of the missing feature? Not sure how to check that either. Stefan -- System Information: Debian Release: 10.8 APT prefers stable APT policy: (990, 'stable'), (50, 'testing') Architecture: armhf (armv7l) Kernel: Linux 5.6.0-2-armmp (SMP w/1 CPU core) Kernel taint flags: TAINT_UNSIGNED_MODULE Locale: LANG=fr_CH.UTF-8, LC_CTYPE=fr_CH.UTF-8 (charmap=UTF-8), LANGUAGE=fr_CH.U TF-8 (charmap=UTF-8) Shell: /bin/sh linked to /usr/bin/dash Init: systemd (via /run/systemd/system) LSM: AppArmor: enabled 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 libgcc-s1 [libgcc1] 10.1.0-3 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 libsoxr0 0.1.2-3 ii libsqlite3-0 3.27.2-3+deb10u1 ii libstdc++6 8.3.0-6 ii libsystemd0 241-7~deb10u6 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: ii avahi-daemon 0.7-4+b1 pn icecast2 <none> ii mpc [mpd-client] 0.31-1 ii pulseaudio 12.2-4+deb10u1 -- Configuration Files: /etc/default/mpd changed: MPD_OPTS="-N -20" /etc/mpd.conf changed: music_directory "/var/lib/mpd/music" playlist_directory "/var/lib/mpd/playlists" db_file "/var/lib/mpd/tag_cache" log_file "/var/log/mpd/mpd.log" pid_file "/run/mpd/pid" state_file "/var/lib/mpd/state" sticker_file "/var/lib/mpd/sticker.sql" user "mpd" bind_to_address "0.0.0.0" input { plugin "curl" } input { enabled "no" plugin "qobuz" } input { enabled "no" plugin "tidal" } decoder { plugin "hybrid_dsd" enabled "no" } audio_output { type "alsa" name "My ALSA Device" mixer_control "Power Amplifier" } replaygain "album" filesystem_charset "UTF-8" -- no debconf information