<div dir="ltr"><div class="gmail_extra"><div class="gmail_quote"><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><div><div class="gmail-h5">
</div></div>Just run htop while an alsa-process needs high cpu load. Copy the<br>
line which shows that from (h)top to this bug report. Or just file a<br>
screenshot to a puplic server somewhere.<br></blockquote><div><br></div><div>Alright: <br></div><div>VLC playing a FLAC file on the default device: </div><div><br></div><div>> PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND <br></div><div>> 26183 andoru 20 0 1191000 66424 46296 S 13.6 0.8 0:09.43 vlc <br></div><div>___________________________________________________________________________________________________</div><div><br></div><div>VLC playing the same file with "Analog Front Speakers" subdevice selected under Audio -> Audio Device: <br></div><div><br></div><div>> PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND </div><div>> 26183 andoru 20 0 1195412 69176 48644 S 1.3 0.9 0:11.35 vlc <br></div><div><br></div><div>___________________________________________________________________________________________________</div><div><br></div><div>As you can see, the CPU decreased from 13.6% to 1.3% when switching the device.<br></div><div>___________________________________________________________________________________________________</div><div>To confirm that this is not an issue with the decoder in VLC here's VLC playing an OGG Vorbis file on the default device: <br></div><div><div><br></div>> PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND </div><div>> 26183 andoru 20 0 1263372 76228 48368 S 18.3 1.0 0:15.95 vlc <br></div><div>___________________________________________________________________________________________________</div><div><br></div><div>Same test as above, this time with an MP3 file: <br></div><div><br></div><div>> PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND </div><div>> 26183 andoru 20 0 1416816 91532 60188 S 17.0 1.2 0:19.64 vlc <br></div><div><br></div><div>___________________________________________________________________________________________________</div><div><br></div><div>And foobar2000 playing FLAC OGG and MP3 files, respectively: <br></div><div><br></div><div><div><br></div><div><div>> PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND </div></div></div><div>> 2375 andoru 20 0 1153140 62276 13140 S 21.3 0.8 29:36.91 foobar2000+ <br></div><div><br></div><div><div>> PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND </div></div><div>> 2375 andoru 20 0 1153140 62032 13140 S 24.6 0.8 29:16.33 foobar2000+</div><div><br></div><div>> PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND </div><div>> 2375 andoru 20 0 1153140 72756 11808 S 22.6 0.9 29:03.99 foobar2000+</div><div><br></div><div><br></div><div>Let me know if you need any additional info.</div><div><br></div><div>Also, in the initial report, I forgot to mention that when I select "Analog Front Speakers" subdevice in VLC, with some decoders (particularly APE) and when the sample rate is below 44100Hz, I can hear some distortion (crackling on high pitched sounds), so I'm guessing the high CPU usage is maybe due to an inefficient resampler?<br></div></div></div></div>