For the record, this seems to be caused by a USB hub. I have no idea why resampling fixes the issue, but a direct connection to the computer, at 44.1kHz, plays fine; clicks only appear when the hub is present. Andrew On Wed, Nov 14, 2012 at 08:52:58PM -0300, Andrew Cooke wrote: > > Well, I have been reading about ALSA and asoundrc and the like, and it appears > that one explanation for the lack of clicks with aplay is that it ends up > being resampled to 48kHz (I do not know why, but this is from the aplay debug > output). And if I define a plug device that does the same then the mp3 also > does not click. Similarly, if I define a plug device that forces 44.1kHs then > I get clicks for the wav file with aplay. > > So my problem seems to be that I have clicks at 44.1kHz - the file format is > irrelevant (which makes sense). > > But still, I do not understand why. > > Andrew > > > On Wed, Nov 14, 2012 at 08:01:02PM -0300, Andrew Cooke wrote: > > > > Hi, > > > > I am an exprienced Linux user, but don't know much about ALSA, and I have a > > strange problem that I do not know how to fix: > > > > When I play mp3s, either directly with mplayer2, or via the audacious music > > player, targetting a USB sound card (AudioEngine D1) via ALSA, I hear clicks. > > However, I do not hear clicks if I use a WAV file (generated from the MP3) > > with aplay, or if I use audacious with Jack at 96kHz (which I think is a > > clumsy way of making audacious upsample to 96kHz before targetting Jack which > > in turn targets ALSA). > > > > > aplay -l > > **** List of PLAYBACK Hardware Devices **** > > card 2: D1 [Audioengine D1], device 0: USB Audio [USB Audio] > > Subdevices: 1/1 > > Subdevice #0: subdevice #0 > > card 3: VLink [Musical Fidelity V-Link], device 0: USB Audio [USB Audio] > > Subdevices: 1/1 > > Subdevice #0: subdevice #0 > > card 4: D2 [Audioengine D2], device 0: USB Audio [USB Audio] > > Subdevices: 1/1 > > Subdevice #0: subdevice #0 > > > > > mplayer2 -ao alsa:device=hw=2.0 test.mp3 > > [audible clicks] > > > > > lame --decode test.mp3 test.wav > > > > > aplay -D default:CARD=D1 -t wav test.wav > > Playing WAVE '/crypto/music/test.wav' : Signed 16 bit Little Endian, Rate > > 44100 Hz, Mono > > [works fine] > > > > > uname -a > > Linux block 3.4.11-2.16-desktop #1 SMP PREEMPT Wed Sep 26 17:05:00 UTC 2012 > > (259fc87) x86_64 x86_64 x86_64 GNU/Linux > > > > I am using OpenSuse 12.2 with their stock (desktop) kernel. ALSA version > > 1.0.25-3.5.1. > > > > I have the same problem with the D2 (and the D1 was fine with OpenSuse 12.1). > > The VLink is fine, but then it's a USB synch-to-asynch buffer, so maybe it > > should work better. > > > > I do not notice any strange values (CPU use, disk use) with atop when the > > clicks happen - this is a lightly loaded, fairly powerful desktop. > > > > Any advice? I have no ALSA-specific configuration - the above is just what > > happens by default. I am using the KDE desktop, which means that phonon is > > running, but I thought I was avoiding that by targetting ALSA directly (I am > > not very impressed with phonon - it seems to get confused if devices are > > unplugged etc and has also given clicks; I was thinking ALSA should be > > simpler...) > > > > Thanks, > > Andrew > > > ------------------------------------------------------------------------------ Monitor your physical, virtual and cloud infrastructure from a single web console. Get in-depth insight into apps, servers, databases, vmware, SAP, cloud infrastructure, etc. Download 30-day Free Trial. Pricing starts from $795 for 25 servers or applications! http://p.sf.net/sfu/zoho_dev2dev_nov _______________________________________________ Alsa-user mailing list Alsa-user@xxxxxxxxxxxxxxxxxxxxx https://lists.sourceforge.net/lists/listinfo/alsa-user
