I had to hard-reboot my Raspberry Pi (unplug the power) running Ubuntu Server 20.04 and since then I cannot run the console music playermocp anymore. The program runs through the initialization of OSS and ALSA drivers, then fails with the message FATAL_ERROR: No valid sound driver! I have tried purging the package (via apt-get purge mocp) and reinstalling it, but the error message remains. Googling around this question brings up a few very old threads ([here](https://moc.daper.net/node/485) and [here](http://moc.daper.net/node/278)) on MOC's own discussion boards, suggesting this to be either an ALSA issue or with the sound card, but I'm not sure about this since when I run alsamixer it starts and I can do things like change the volume of it. Plus, if run other programs that use audio like mpg123 the audio is fine. Detailed error log extracted with mocp -F is shown below, sorry if it's a little verbose. Does anybody know what might be causing this? Many thanks! Aug 31 15:34:23.139072: main.c:1191 main(): This is Music On Console (version 2.6-alpha3) Aug 31 15:34:23.139216: main.c:1195 main(): Configured: '--build=arm-linux-gnueabihf' '--prefix=/usr' '--includedir=${prefix}/include' '--mandir=${prefix}/share/man' '--infodir=${prefix}/share/info' '--sysconfdir=/etc' '--localstatedir=/var' '--disable-silent-rules' '--libdir=${prefix}/lib/arm-linux-gnueabihf' '--runstatedir=/run' '--disable-maintainer-mode' '--disable-dependency-tracking' 'build_alias=arm-linux-gnueabihf' 'CFLAGS=-g -O2 -fdebug-prefix-map=/build/moc-NiZ4Xl/moc-2.6.0~svn-r2994=. -fstack-protector-strong -Wformat -Werror=format-security -Wall -pedantic' 'LDFLAGS=-Wl,-Bsymbolic-functions -Wl,-z,relro -Wl,-z,now -Wl,--as-needed' 'CPPFLAGS=-Wdate-time -D_FORTIFY_SOURCE=2' 'CXXFLAGS=-g -O2 -fdebug-prefix-map=/build/moc-NiZ4Xl/moc-2.6.0~svn-r2994=. -fstack-protector-strong -Wformat -Werror=format-security' Aug 31 15:34:23.139240: main.c:1205 main(): Running on: Linux 5.4.0-1015-raspi armv7l Aug 31 15:34:23.140180: main.c:1157 log_command_line(): mocp -F Aug 31 15:34:23.140265: main.c:1171 log_popt_command_line(): mocp --foreground Aug 31 15:34:23.159074: decoder.c:700 load_plugins(): Loaded 11 decoders: aac flac modplug mp3 musepack opus sidplay2 sndfile speex vorbis wavpack Aug 31 15:34:23.159160: server.c:360 server_init(): Starting MOC Server Aug 31 15:34:23.159210: log.c:233 log_init_stream(): Writing log to: stdout Aug 31 15:34:23.159384: server.c:300 log_process_stack_size(): Process's stack size: 8388608 Aug 31 15:34:23.159402: server.c:317 log_pthread_stack_size(): PThread's stack size: 8388608 Trying JACK... Aug 31 15:34:23.160789: jack.c:121 error_cb(): ERROR: JACK: Cannot connect to server socket err = No such file or directory Aug 31 15:34:23.160809: server.c:672 add_event_all(): No events have been added because there are no clients Aug 31 15:34:23.160847: jack.c:121 error_cb(): ERROR: JACK: Cannot connect to server request channel Aug 31 15:34:23.160861: server.c:672 add_event_all(): No events have been added because there are no clients Aug 31 15:34:23.163010: jack.c:121 error_cb(): ERROR: JACK: jack server is not running or cannot be started Aug 31 15:34:23.163028: server.c:672 add_event_all(): No events have been added because there are no clients Aug 31 15:34:23.163298: jack.c:121 error_cb(): ERROR: JACK: JackShmReadWritePtr::~JackShmReadWritePtr - Init not done for -1, skipping unlock Aug 31 15:34:23.163317: server.c:672 add_event_all(): No events have been added because there are no clients Aug 31 15:34:23.163332: jack.c:121 error_cb(): ERROR: JACK: JackShmReadWritePtr::~JackShmReadWritePtr - Init not done for -1, skipping unlock Aug 31 15:34:23.163344: server.c:672 add_event_all(): No events have been added because there are no clients Aug 31 15:34:23.163369: jack.c:148 moc_jack_init(): ERROR: jack_client_open() failed, status = 0x11 Aug 31 15:34:23.163381: server.c:672 add_event_all(): No events have been added because there are no clients Aug 31 15:34:23.163393: jack.c:150 moc_jack_init(): ERROR: Unable to connect to JACK server Aug 31 15:34:23.163404: server.c:672 add_event_all(): No events have been added because there are no clients Trying ALSA... Aug 31 15:34:23.163423: alsa.c:477 alsa_init(): Initialising ALSA device: default Aug 31 15:34:23.165678: alsa.c:365 alsa_init_mixer_channel(): ERROR: Can't find mixer PCM Aug 31 15:34:23.165710: server.c:672 add_event_all(): No events have been added because there are no clients Aug 31 15:34:23.165733: alsa.c:365 alsa_init_mixer_channel(): ERROR: Can't find mixer Master Aug 31 15:34:23.165751: server.c:672 add_event_all(): No events have been added because there are no clients Trying OSS... Aug 31 15:34:23.165829: oss.c:206 oss_init(): ERROR: Can't open mixer device /dev/mixer: No such file or directory Aug 31 15:34:23.165851: server.c:672 add_event_all(): No events have been added because there are no clients Aug 31 15:34:23.165899: oss.c:71 open_dev(): ERROR: Can't open /dev/dsp: No such file or directory Aug 31 15:34:23.165918: server.c:672 add_event_all(): No events have been added because there are no clients Aug 31 15:34:23.165939: oss.c:87 set_capabilities(): ERROR: Can't open the device. Aug 31 15:34:23.165956: server.c:672 add_event_all(): No events have been added because there are no clients Aug 31 15:34:23.166034: audio.c:926 find_working_driver(): FATAL ERROR: No valid sound driver!

there is a a computer (homeserver) in the lan (24/4 on) with speakers connected. the linux system can play music with the programm "mocp" (music on console). i would like to give other users in the lan access to moc to play music. they should connect with ssh to the computer. but there must be a user they only can run the moc programm, if it ends, the ssh connection must end. there is a specific directory (with the music to play) only this should moc and the ssh user see and use. (if moc starts, it can be disconnected with "q" or with "Q" quit.) is this possible, and how?

The only command line solution for gapless playback I found so far (working with ALSA and JACK) is moc (»music on console«). While I'm still searching for a simpler way I was wondering if it is possible to loop an audio file into a new file for a given number of times? Something like: loop-audio infile.flac --loop 32 outfile.flac for repeating infile.flac 32 times into outfile.flac