27.08.2014 03:57, Matthias Gro?mann wrote: > Hi, > > when playing audio files on a QNAP TS-212 NAS (ARM CPU) / Creative > Sound Blaster X-Fi HD USB sound card, I do not hear any > sound. Commands like "paplay spacemusic.au" or "aplay spacemusic.au" > block for the duration of the audio file and return without an error > message, but do not produce anything audible. > > Playing audio files bypassing pulseaudio with "aplay -D sysdefault > spacemusic.au" works (apart from occasional crackling and pauses, > which is probably a different problem). When connected to my notebook > (i386), the sound card works even with pulseaudio, so this appears to > be an ARM specific problem. > > According to the log files, the sink is not muted and the volume is > above 50%. > > I tried to delete ~/.pulse*, which did not change anything. > > OS on both the NAS and the notebook is Debian 7.6 (wheezy) with > PulseAudio 2.0 > > Log files can be found in the original report of this problem > (https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=756850). > > Any help is very much appreciated. Just a shot in the dark: on your NAS, speex (used for resampling) might be compiled to use fixed-point support internally instead of the usual floating-point. PulseAudio 2.0 is incompatible with such speex. A fix is in the recent git. Please try an equivalent change in configuration. In /etc/pulse/daemon.conf, please write: resample-method = speex-fixed-3 or, if that eats too much CPU and you don't mind some slightly audible distortions on pure tones above 2 kHz, try speex-fixed-1. -- Alexander E. Patrakov
