(first-time poster to list) My snd_aloop loopback device appears to be running too fast and is causing overruns. OS is Mageia 2. Kernel is 3.4.32-server-2.mga2. Hardware is Asus P6T6 WS Revolution in case that matters. First symptom: Was using snd_aloop with JACK for a zero- client setup with Mageia 1 on the machine running snd_aloop, and sound quality was good. Switching to Mageia 2, sound quality is terrible. It sounds like there's a short silent period several times a second--badly chopped-sounding. Tried all the JACK tuning I could find to no avail. This might not be directly caused by the loopback device. Second symptom: I wrote two programs. The first captures from the loopback device and sends the data to a network port. The second receives the data from a network port and plays to a real soundcard. With settings for CD rate, 44100 frames per second, 176000 bytes per second, the sender would get overruns every couple of seconds starting about 15 seconds after starting. Instrumenting the sender for data capture rate showed about 55k frames per second. Third symptom: Swithed to standard components: aplay, arecord, pv, and nc in this manner: sender: arecord -D hw:2,1,0 -t raw -f cd - | pv | nc localhost 51230 receiver: nc -l 51230 | pv | aplay -t raw -f cd This shows the same pattern of overruns in the sender that my program saw. The receiver shows about 172kB/s, but the sender shows 215kB/s until the overruns start being reported. Adding a '-a' option to the pv commands, and doing "pv -a" on the stream that feeds aplay to hw:2,0,0 of a CD-rate track and letting everything run for a while, the aplay into hw:2,0,0 shows 217kB/s, the sender shows 181kB/s, and the receiver shows 172kB/s. Shouldn't the loopback device control the frame rate to be what the applications opened it for? Is there a solution to keep the above sender and receiver command chain from having overruns? Thanks, Robert ------------------------------------------------------------------------------ Everyone hates slow websites. So do we. Make your web apps faster with AppDynamics Download AppDynamics Lite for free today: http://p.sf.net/sfu/appdyn_d2d_feb _______________________________________________ Alsa-user mailing list Alsa-user@xxxxxxxxxxxxxxxxxxxxx https://lists.sourceforge.net/lists/listinfo/alsa-user
